CRSC · California Referenced Standards Code

Endurance, torque and roller‑latch test requirements

Manufacturers must test locks and latches per CRSC **§ 12‑10‑204** (static loads, releasing torque, 800,000‑cycle endurance, roller‑latch tests) and measure coating thickness per **§ 12‑10‑205**; samples must meet specified torque/force limits and survive the cycles with documented test reports.

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Last reviewed: July 6, 2026

What the code requires — plain English

The California Referenced Standards Code requires manufacturers to subject single‑point latches and locks to specific endurance, static (torque/axial/vertical) and releasing/roller‑latch tests and to document results in a verified report. The controlling test and acceptance criteria are in § 12‑10‑204 (endurance and performance tests) and coating thickness acceptance methods are in § 12‑10‑205.

The single most important rule: locks and latches must survive the specified static loading and endurance cycles and still operate within the stated torque/force limits in § 12‑10‑204.

Requirements in detail

Scope, sampling and reporting (overview)

  • Testing must be done at a State Fire Marshal‑approved laboratory or by an acceptable independent fire protection engineer; the test report must include installation instructions, materials data and verified test results. § 12‑10‑204 (a)–(b).
  • Samples are selected at random from current production; variations in basic mechanical design or materials require additional testing or approved modifications. § 12‑10‑204 (c).

Static loading tests (what loads/torques are applied)

  • Torque loading test: apply 300 inch‑pounds of torque to the inside knob/lever (knob/lever pre‑retracted) and verify automatic return/extension after removal. Three representative units; no failures. § 12‑10‑204 (e).
  • Axial load: apply 500 pounds in line with spindle axis to outside then inside knob/lever; neither shall pull off. Three samples; no failures. § 12‑10‑204 (f).
  • Vertical load: apply 350 pounds downward perpendicular to spindle axis to outside then inside knob/lever; neither shall break off. Three samples; no failures. § 12‑10‑204 (g).

Releasing / releasing‑torque test

  • Apply a 50‑pound horizontal force against the latching edge (applied 3 inches above the spindle center) to force the latch flat against the strike edge. After at least 25 unlatchings under that load, not more than 30 inch‑pounds of torque on inside knobs (either direction) — or 15 pounds downward pressure on inside levers — shall be required to retract the latch. After the specified endurance cycling the torque/pressure must still meet these limits. § 12‑10‑204 (h).

Endurance (life) test — cyclic durability and acceptance

  • Samples: five latches/locks installed per manufacturer instructions; record initial torque to fully retract latch (average of five). § 12‑10‑204 (i).
  • Cycles: each sample is subjected to 800,000 operating cycles at ~10 cycles/minute; a cycle is: turn inside knob to retract, open door (after latch bolt is free), release knob to allow latch to extend by its own spring. Each latch must continue to extend throughout the test. § 12‑10‑204 (i).
  • Acceptance: at end of test the torque to retract the latch bolts of any four latch bolts shall not exceed two times the initial average torque. If two latches fail or torque of any four exceeds 2× average, test an additional five samples and then any seven latches shall not exceed two times the initial average. § 12‑10‑204 (i).

Roller‑latch specific tests and installation

  • Fire test: roller latches installed in a composite test fire door per manufacturer instructions are subjected to the fire test SFM 12‑7‑4 for 30 minutes; during the test the latch must require an opening pressure of 20 pounds. § 12‑10‑204 (j)(1).
  • Endurance: five roller‑latch samples subjected to the same endurance test as § 12‑10‑204(i). During the test the roller must continue to extend without failure and the opening pressure at the end of the test must be at least 15 pounds. § 12‑10‑204 (j)(2).
  • Installation requirement: roller‑latch doors must be hung in steel frames only, with jambs anchored to prevent spreading; horizontal bracing in the wall behind the strike is required. § 12‑10‑204 (j)(3).

Coating thickness (corrosion protection)

  • Methods allowed: (1) cross‑section measurement under microscope; (2) reagent dropping test to penetration and calculation from reagent properties. Thickness testing does not apply when other corrosion‑resistant processes achieve equivalent performance; in those cases acceptance is by comparison in salt fog per ASTM B‑117. § 12‑10‑205.

Quick reference table (decision‑relevant values)

Test / parameter Required value / limit Notes (decision use) Code Reference
Torque loading 300 in‑lb applied to inside knob/lever Knob/lever pre‑retracted; 3 units, no failures § 12‑10‑204 (e)
Axial load 500 lb (axis of spindle) Apply to outside then inside; 3 units, no failures § 12‑10‑204 (f)
Vertical load 350 lb downward Applied via sling conforming to knob; 3 units, no failures § 12‑10‑204 (g)
Releasing horizontal load 50 lb, 3 in above spindle Force flat of latch bolt against strike during test § 12‑10‑204 (h)
Releasing torque after preload ≤ 30 in‑lb (knob) or ≤ 15 lb downward (lever) After ≥25 unlatchings under 50 lb load; must hold after endurance § 12‑10‑204 (h)
Endurance cycles (locks/latches) 800,000 cycles per sample 5 samples initial; recorded initial average torque § 12‑10‑204 (i)
Endurance acceptance Torque of any 4 latches ≤ 2× initial avg If 2 fails or criteria exceeded, test 5 more; then any 7 ≤2× avg § 12‑10‑204 (i)
Roller‑latch opening pressure (initial) 20 lb During 30‑min fire test; adjusted to 20 lb opening pressure § 12‑10‑204 (j)(1)
Roller‑latch opening pressure (post‑endurance) ≥ 15 lb After endurance per § 12‑10‑204(i) § 12‑10‑204 (j)(2)
Coating thickness methods Cross‑section microscope OR reagent drop test; ASTM B‑117 for equivalence Acceptance by salt‑fog comparison for other processes § 12‑10‑205

Exceptions & special cases

  • Devices with mechanical variations (dead‑locking bolts, lever handles, shear pins, etc.) may require modified test procedures; any modification must be filed with and approved by the State Fire Marshal before testing. § 12‑10‑204 (c)(2).
  • For roller latches on fire doors, the latch must pass the SFM 12‑7‑4 fire test for 30 minutes as part of acceptance. § 12‑10‑204 (j)(1).
  • Coating thickness testing is not required when an alternate corrosion‑resistant process demonstrates equivalence in ASTM B‑117 salt‑fog testing—acceptance by comparison only. § 12‑10‑205.

Common mistakes

  • Treating the initial recorded torque as a pass/fail without computing the average of five samples — the acceptance multiplier (2×) is against the initial average, not individual initials. § 12‑10‑204 (i).
  • Confusing the static torque limits (300 in‑lb torque loading test) with the releasing torque limits (30 in‑lb knob / 15 lb lever) — they are distinct tests with different purposes and sample counts. § 12‑10‑204 (e), (h).
  • Forgetting the special installation requirement for roller latches (steel frames anchored to prevent jamb spreading) when evaluating field installation or test setup. § 12‑10‑204 (j)(3).
  • Incorrectly applying endurance numbers from other sections: releasing systems (panic hardware) use different cycle counts (see related standards) — verify which standard and subsection applies for the device under test. § 12‑10‑204 vs § 12‑10‑304.

Worked example — concrete scenario

A manufacturer submits five identical mortise latches for endurance testing. They measure the torque needed to fully retract each latch before cycling and record: 18, 20, 22, 19, 21 inch‑pounds. The initial average = (18+20+22+19+21) / 5 = 20 in‑lb. § 12‑10‑204 (i).

  • They subject each sample to 800,000 cycles per § 12‑10‑204 (i).
  • Acceptance criterion: torque to retract for any four latches at test end must be ≤ 2 × 20 in‑lb = 40 in‑lb. If two latches fail or torque of any four exceeds 40 in‑lb, they must test five additional samples and then show that torque of any seven is ≤ 40 in‑lb. § 12‑10‑204 (i).

Separately, during the releasing torque test they apply 50 lb horizontal preload (3 in above spindle) and perform ≥25 unlatchings. At that stage the inside knob must require ≤ 30 in‑lb torque to retract (or ≤ 15 lb downward pressure if a lever). § 12‑10‑204 (h).

Related provisions

  • § 12‑10‑201 — Approved installation instructions required (manufacturer must provide and report them).
  • § 12‑10‑202 — Design requirements (knob/lever geometry, self‑releasing inside knob, backset, throw).
  • § 12‑10‑203 — Construction materials and corrosion resistance baseline.
  • § 12‑10‑206 — Marking: manufacturer name/model identification marking requirements.
  • § 12‑10‑304 — Endurance/performance tests for releasing mechanisms (different cycle requirements — e.g., 100,000 cycles for some releasing systems). Check when applying to panic/exit hardware.
  • SFM 12‑7‑4 — Fire Door Assembly Tests referenced for roller‑latch fire testing.

Code references

Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:

  • CRSC § 12-10 High relevance — show source text

    (g) Vertical load test. Each latch or lock shall be installed as described in Section 12-10-204 (e). Each latch or lock shall be subjected to a vertical downward force applied perpendicular to the spindle axis through a sling which shall conform to the knob shape. A vertical downward force of 350 pounds shall be applied first to the outside knob and then to the inside knob or lever. Neither knob nor lever shall break off under the downward force. Three latches or locks shall be tested and there shall be no failures.

    (h) Releasing torque test. A latch or lock set shall be installed as described in Section 12-10-204 (e). A hydraulic or pneumatic loading device shall be used to apply a horizontal force of 50 pounds against the latching edge of the test block 3 inches (76 mm) above and in the vertical center of the latch or lock spindle in such a direction that the flat of the latch bolt is forced against the edge of the latch hole in the strike. After not less than 25 unlatchings under the above-prescribed load not more than 30 inch-pounds of torque on the inside knob in either direction or 15 pounds of downward pressure on an inside lever shall be required to retract the latch bolt. After 100,000 cycles of the endurance test as described in Section 12-10-204 (i), the torque or downward pressure necessary to retract the latch bolt shall not exceed the above-prescribed limits.

    (i) Endurance test. Five latches or locks shall be subjected to an accelerated endurance test as provided in this subsection. The locks shall be installed in the door of the endurance testing apparatus in accordance with the manufacturer’s installation instructions. The latch or lock shall be operated to retract the latch, open the door, and close the door at a rate of approximately 10 cycles per minute. A cycle shall consist of the following:

    1. Turn the inside knob to retract the latch bolt.

    2. Open the door after the latch bolt is restricted to clear the strike.

    3. Release the knob allowing the latch bolt to return to its extended position by action of its own spring.

    After insertion of the latches or locks in the test door the torque in inch-pounds necessary to fully retract the latch bolts shall be recorded. The torque shall be the average recorded for the five latches or locks. Each sample shall be subjected to 800,000 operating cycles as described above. Each latch shall continue to extend itself per cycle 3 above throughout the test. At the end of the endurance test the torque to retract the latch bolts of any four latch bolts shall not exceed two times the initial average torque. If two latches fail to operate successfully at the end of the test or the torque of any four latches exceeds two times the initial average torque, an additional five latches or locks shall be subjected to the endurance test and the torque of any seven latches shall not exceed two times the initial average torque.

    (j) Roller latches.

    1. Fire test. Roller latches shall be installed in a composite test fire door in accordance with the manufacturer’s installation instructions and subjected to the fire test as described in SFM 12-7-4, for a period of 30 minutes. The latch shall be adjusted to an opening pressure of 20 pounds applied to the closing edge immediately above the latch. Throughout the test the latch shall require an applied pressure of 20 pounds to open the door.
    2. Endurance test. Five samples of the roller latch shall be subjected to the endurance test as described in Section 12-10-204 (i).
  • CRSC § 12-7 High relevance — show source text

    1. Turn the inside knob to retract the latch bolt.

    2. Open the door after the latch bolt is restricted to clear the strike.

    3. Release the knob allowing the latch bolt to return to its extended position by action of its own spring.

    After insertion of the latches or locks in the test door the torque in inch-pounds necessary to fully retract the latch bolts shall be recorded. The torque shall be the average recorded for the five latches or locks. Each sample shall be subjected to 800,000 operating cycles as described above. Each latch shall continue to extend itself per cycle 3 above throughout the test. At the end of the endurance test the torque to retract the latch bolts of any four latch bolts shall not exceed two times the initial average torque. If two latches fail to operate successfully at the end of the test or the torque of any four latches exceeds two times the initial average torque, an additional five latches or locks shall be subjected to the endurance test and the torque of any seven latches shall not exceed two times the initial average torque.

    (j) Roller latches.

    1. Fire test. Roller latches shall be installed in a composite test fire door in accordance with the manufacturer’s installation instructions and subjected to the fire test as described in SFM 12-7-4, for a period of 30 minutes. The latch shall be adjusted to an opening pressure of 20 pounds applied to the closing edge immediately above the latch. Throughout the test the latch shall require an applied pressure of 20 pounds to open the door.
    2. Endurance test. Five samples of the roller latch shall be subjected to the endurance test as described in Section 12-10-204 (i). The latch shall continue to extend the roller throughout the test without any failure. The opening pressure at the end of the test shall not be less than 15 pounds.
    3. Installation. Doors utilizing roller latches shall be installed in doors hung in steel frames only. Frame jambs shall be anchored to the floor to prevent spreading of the jambs. In other than concrete fill floors the jambs shall be anchored to a steel sill or steel floor plate extending between the jambs to prevent spreading of the frame. Horizontal bracing shall be provided in the wall in back of the strike.

    THICKNESS OF COATINGS TESTS

    Sec. 12-10-205. The thickness of cadmium, zinc or bronze plated coatings applied for corrosion resistance may be determined by either of the following methods:

    1. Cross sections of coated samples cut at 90 exposed edges polished and thickness measured with a suitable microscope and scale.

    2. Dropping test of a suitable reagent at a definite rate until coating is penetrated. The thickness is calculated from the known characteristics of the reagent at the observed temperature and time required for the end point to appear.

    Thickness testing shall not apply to other processes having equal corrosion resistance; acceptance shall be determined by comparison in salt fog atmosphere per ASTM Method B-117.

    MARKING

    Sec. 12-10-206. The name of the manufacturer, or trademark by which the manufacturer can be readily identified, shall be legibly marked on the latch or lock where it can be seen after installation. When the manufacturer produces similar devices, the type, model

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  • CRSC § 12-10 High relevance — show source text

    Except as shown, materials shall be of steel, welded or bolted. The test apparatus may be of alternate design and construction having equivalent or greater rigidity. 2. Endurance test. Apparatus for the endurance test shall consist of frame and test door as shown in Figure 12-10-2-2. An alternate design having equivalent or greater rigidity may be utilized. Alternate designs utilizing components of greater dimensions or greater rigidity may affect details of the approval and listing. 3. Test equipment. Torque wrenches, spring scales, hydraulic or pneumatic pressure scales, or other instruments shall be calibrated in an approved manner. (e) Torque loading test. Each latch or lock shall be installed in a 1 [3] / 4 -inch (44 mm) thick test block in accordance with the manufacturer’s installation instructions. The test block shall be installed in the static loading test fixture. The torque load shall be applied to the inside door knob or lever. The knob or lever shall be turned or depressed to fully retract the latch bolt or dead bolt before application of the torque load. The applied torque load shall be 300 inch-pounds. After removal of the torque load the latch shall automatically return to its latch position, the dead bolt shall be extended to its locked position.

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    Subsequent hand turning of the knob or depressing the lever shall retract the latch or dead bolt. Three representative latches and/or locks shall be tested and there shall be no failures.

    (f) Axial load. Each latch or lock shall be installed as described in Section 12-10-204 (e). A hydraulic loading device or load dynamometer shall be applied first to the outside knob and then to the inside knob or lever so that the force applied to the knob or lever is in line with the axis of the spindle. The axial load applied alternately to the outside knob and inside knob or lever shall be 500 pounds. Neither knob nor lever shall pull off under the axial load. Three representative latches and/or locks shall be tested and there shall be no failures.

    (g) Vertical load test. Each latch or lock shall be installed as described in Section 12-10-204 (e). Each latch or lock shall be subjected to a vertical downward force applied perpendicular to the spindle axis through a sling which shall conform to the knob shape. A vertical downward force of 350 pounds shall be applied first to the outside knob and then to the inside knob or lever. Neither knob nor lever shall break off under the downward force. Three latches or locks shall be tested and there shall be no failures.

    (h) Releasing torque test. A latch or lock set shall be installed as described in Section 12-10-204 (e). A hydraulic or pneumatic loading device shall be used to apply a horizontal force of 50 pounds against the latching edge of the test block 3 inches (76 mm) above and in the vertical center of the latch or lock spindle in such a direction that the flat of the latch bolt is forced against the edge of the latch hole in the strike. After not less than 25 unlatchings under the above-prescribed load not more than 30 inch-pounds of torque on the inside knob in either direction or 15 pounds of downward pressure on an inside lever shall be required to retract the latch bolt.

  • CRSC § 12-10 High relevance — show source text

    The report shall include the manufacturer’s installation instructions. The report shall be verified by the laboratory or fire protection engineer responsible for the conduct of the test. The test report and evidence of listing by an approved listing agency may be provided for the applicable portions of these endurance and performance test procedures. Test reports prepared for other governmental agencies may be utilized to the extent that the test procedures contained herein have been duplicated.

    (c) Test latches or locks.

    1. Samples. Samples of the test latch or lock shall be selected by the testing agency or fire protection engineer at random from the manufacturer’s current production runs. The types tested shall be considered to represent, for purposes of approval and listing, all lock types of a series, except that when there are variations of basic mechanical design and/or materials for mechanical parts, each variation shall be tested for compliance with the minimum performance test procedures.
    2. Modifications in design or test procedure. Devices involving dead-locking bolts, lever handles, shear pins in the outside know or other variations in design may require modifications in the test procedure in order to simulate the intended inservice conditions. Requests for modifications in the design and test procedures shall be filed for evaluation and approval by the State Fire Marshal before proceeding with the test.

    (d) Test equipment.

    1. Static loading. The static loading apparatus used for the torque loading, axial load, vertical load and releasing torque tests shall consist of frame, test door and test block as detailed in Figure 12-10-2-1. Except as shown, materials shall be of steel, welded or bolted. The test apparatus may be of alternate design and construction having equivalent or greater rigidity.
    2. Endurance test. Apparatus for the endurance test shall consist of frame and test door as shown in Figure 12-10-2-2. An alternate design having equivalent or greater rigidity may be utilized. Alternate designs utilizing components of greater dimensions or greater rigidity may affect details of the approval and listing.
    3. Test equipment. Torque wrenches, spring scales, hydraulic or pneumatic pressure scales, or other instruments shall be calibrated in an approved manner. (e) Torque loading test. Each latch or lock shall be installed in a 1 [3] / 4 -inch (44 mm) thick test block in accordance with the manufacturer’s installation instructions. The test block shall be installed in the static loading test fixture. The torque load shall be applied to the inside door knob or lever. The knob or lever shall be turned or depressed to fully retract the latch bolt or dead bolt before application of the torque load. The applied torque load shall be 300 inch-pounds. After removal of the torque load the latch shall automatically return to its latch position, the dead bolt shall be extended to its locked position.

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    Subsequent hand turning of the knob or depressing the lever shall retract the latch or dead bolt. Three representative latches and/or locks shall be tested and there shall be no failures.

  • CRSC § 12-10 High relevance — show source text

    CONSTRUCTION MATERIALS

    Sec. 12-10-203.

    (a) Cases, interior working parts. Cases, latch or lock enclosures, and interior working parts shall be of brass, bronze, steel, monel, stainless steel or of materials equivalent in mechanical strength to brass or bronze. Cases of mortise locks may be of cast iron.

    (b) Latch bolts, strikes. Latch bolts and strikes shall be of brass, bronze, monel, stainless steel or materials equivalent in mechanical strength having corrosion resistance equivalent to brass or bronze.

    (c) Corrosion resistance. Cases, enclosures and internal working parts shall have corrosion resistance equivalent to cadmium plating not less than 0.00015 inch (0.004 mm) thick or zinc plating not less than 0.0004 inch (0.01 mm) thick, or processed to give equal corrosion resistance as determined by comparison in salt fog atmosphere per ASTM Method B-117.

    (d) Nonmetallic materials. Nonmetallic materials may be used as coatings or for wearing surfaces, rollers and finishes, and antifriction inserts, or for similar purpose if the material otherwise conforms to these requirements.

    (e) Springs. Component springs used in the assembly of a latch or lock shall be of material having spring properties equivalent to stainless steel conforming to ASTM A313.67.

    ENDURANCE AND PERFORMANCE TEST PROCEDURES

    Sec. 12-10-204.

    (a) Testing laboratory. Tests shall be conducted at a testing laboratory approved by the State Fire Marshal, or tests shall be conducted by a qualified independent fire protection engineer, acceptable to the State Fire Marshal, in testing facilities acceptable to the State Fire Marshal.

    (b) Report. The test report shall include a detailed description of the latch or lock and its intended function; engineering data, shop drawings and photographs; identification of materials as to source, composition, strength and corrosion resistance; the physical or chemical tests including dimensions of parts before and after the endurance tests establishing conformance of materials. The report shall include the manufacturer’s installation instructions. The report shall be verified by the laboratory or fire protection engineer responsible for the conduct of the test. The test report and evidence of listing by an approved listing agency may be provided for the applicable portions of these endurance and performance test procedures. Test reports prepared for other governmental agencies may be utilized to the extent that the test procedures contained herein have been duplicated.

    (c) Test latches or locks.

    1. Samples. Samples of the test latch or lock shall be selected by the testing agency or fire protection engineer at random from the manufacturer’s current production runs. The types tested shall be considered to represent, for purposes of approval and listing, all lock types of a series, except that when there are variations of basic mechanical design and/or materials for mechanical parts, each variation shall be tested for compliance with the minimum performance test procedures.
    2. Modifications in design or test procedure. Devices involving dead-locking bolts, lever handles, shear pins in the outside know or other variations in design may require modifications in the test procedure in order to simulate the intended inservice conditions. Requests for modifications in the design and test procedures shall be filed for evaluation and approval by the State Fire Marshal before proceeding with the test.

    (d) Test equipment.

    1. Static loading. The static loading apparatus used for the torque loading, axial load, vertical load and releasing torque tests shall consist of frame, test door and test block as detailed in Figure 12-10-2-1. Except as shown, materials shall be of steel, welded or bolted.
  • CRSC § 12-10 High relevance — show source text

    EXITS

    (f) Nonmetallic materials. Nonmetallic materials may be used as coatings for wearing surfaces, rollers, finishes or for similar purposes if the materials otherwise conform to these requirements.

    ENDURANCE AND PERFORMANCE TESTS

    Sec. 12-10-304.

    (a) Testing laboratory. Tests shall be conducted at a testing laboratory approved by the State Fire Marshal, or tests shall be conducted by a qualified independent fire protection engineer, acceptable to the State Fire Marshal in test facilities acceptable to the State Fire Marshal.

    (b) Report. The test report shall include a detailed description of the releasing mechanism and its intended function; engineering data, shop drawings and photographs; identification of materials as to source, composition, strength and corrosion resistance; the physical or chemical tests including dimension of parts before and after the endurance tests establishing conformance of materials. The report shall include copies of the manufacturer’s installation instructions. The report shall be verified by the laboratory or fire protection engineer responsible for the conduct of the test. The test report and evidence of listing by an approved listing agency may be provided for the applicable portions of these endurance and performance tests.

    (c) Test equipment. The releasing mechanism shall be applied on a suitable door hung on heavy duty ball bearing butts or pivots installed in a suitable metal frame in accordance with the manufacturer’s instructions. A motor-driven mechanism shall be used to actuate the cross-bar so as to release the latches or dead-locking bolts, push the door open and jerk the door shut so that the latches or dead-locking bolts operate as in service. The rate of operation or number of cycles shall be approximately ten per minute. For the test the assembly is to have only the lubrication which is provided at the factory or as recommended by the manufacturer in his installation instructions.

    Note: Mechanisms involving dead-locking bolts may require modification in the test procedure in order to simulate the intended in-service condition. Modifications in the test procedure shall be filed for evaluation and approval before proceeding with the test.

    (d) Releasing pressure. The motor-driven mechanism shall be arranged to apply not to exceed 15 pounds pressure against the cross-bar to release the door latch(es) or dead-locking bolts before the door is pushed open.

    (e) Cycle test. The release mechanism and latches or dead-locking bolts shall function as intended for 100,000 cycles of operation without failure or excessive wear of the parts.

    EMERGENCY OPERATION TEST

    Sec. 12-10-305.

    (a) Releasing pressure. The release mechanism shall be so designed that a horizontal force of 50 pounds or less will actuate the release bar and latches or dead-locking bolt when the latched or locked door is subjected to outward pressure as described in Sections 12-10-305 (c) and (d). The horizontal force shall be applied at any point along the cross-bar perpendicular to the door in the direction of swing.

    (b) Test specimen. The test specimen for the emergency operation test shall be the sample which has been previously subjected to the cycle test specified in Section 12-10-304.

    (c) Testing instrument. The horizontal force applied to the cross-bar shall be measured with a calibrated spring scale or other approved means.

    (d) Outward pressure, single door. A hydraulic loading device or load dynamometer shall be used to apply a horizontal force of 250 pounds against the latching edge in the direction in which the door opens. The thrust load shall be applied to the stile immediately above the latching mechanism.

  • CRSC § 12-10 Medium relevance — show source text

    (f) Dogging devices. Exit panic hardware mechanisms shall not be equipped with any locking or dogging device, set screw or other arrangement which can be used to prevent release of the door latch or latches, locking device or dead locking bolt when pressure is applied to the cross-bar.

    CONSTRUCTION MATERIALS

    Sec. 12-10-303.

    (a) Strength. The materials used in the assembly of a releasing mechanism shall have mechanical strength equivalent to brass or bronze to perform their intended function.

    (b) Springs. Component springs used in the assembly of a releasing mechanism shall be of material having spring properties equivalent to stainless steel conforming to ASTM A313-67.

    (c) Corrosion resistance of moving parts. Moving parts in the releasing mechanism assembly shall have corrosion resistance equivalent to 300 series stainless steel, or shall show no visual signs of corrosion after being subjected to a salt fog atmosphere per ASTM B117 for a period of 120 hours.

    (d) Nonmoving parts. Nonmoving parts, cases and similar parts shall be of materials, or shall be coated to provide corrosion protection equivalent to 0.0005-inch-thick (0.01 mm) cadmium coated steel as determined by comparison in salt fog atmosphere per ASTM B117 for a period of not less than 16 hours.

    (e) Galvanic action. Coated or uncoated metals used in the assembly of releasing mechanisms shall not be used in combination such as to cause detrimental galvanic action which may adversely affect the function of any part of the assembly.

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    (f) Nonmetallic materials. Nonmetallic materials may be used as coatings for wearing surfaces, rollers, finishes or for similar purposes if the materials otherwise conform to these requirements.

    ENDURANCE AND PERFORMANCE TESTS

    Sec. 12-10-304.

    (a) Testing laboratory. Tests shall be conducted at a testing laboratory approved by the State Fire Marshal, or tests shall be conducted by a qualified independent fire protection engineer, acceptable to the State Fire Marshal in test facilities acceptable to the State Fire Marshal.

    (b) Report. The test report shall include a detailed description of the releasing mechanism and its intended function; engineering data, shop drawings and photographs; identification of materials as to source, composition, strength and corrosion resistance; the physical or chemical tests including dimension of parts before and after the endurance tests establishing conformance of materials. The report shall include copies of the manufacturer’s installation instructions. The report shall be verified by the laboratory or fire protection engineer responsible for the conduct of the test. The test report and evidence of listing by an approved listing agency may be provided for the applicable portions of these endurance and performance tests.

    (c) Test equipment. The releasing mechanism shall be applied on a suitable door hung on heavy duty ball bearing butts or pivots installed in a suitable metal frame in accordance with the manufacturer’s instructions. A motor-driven mechanism shall be used to actuate the cross-bar so as to release the latches or dead-locking bolts, push the door open and jerk the door shut so that the latches or dead-locking bolts operate as in service. The rate of operation or number of cycles shall be approximately ten per minute. For the test the assembly is to have only the lubrication which is provided at the factory or as recommended by the manufacturer in his installation instructions.

  • CRSC § 5-5 Medium relevance — show source text

    000|5-5|6-1|4-8|4-10|4-4|3-9|3-6|2-10|2-10| |12|1-#4|60,000|6-7|7-5|5-8|5-11|5-4|4-7|4-3|3-6|3-5| |12|1-#5|40,000|6-9|7-7|5-9|6-0|5-5|4-8|4-4|3-7|3-6| |12|1-#5|60,000|9-4|10-6|8-1|8-4|7-6|6-6|6-1|5-0|4-10| |12|2-#4
    1-#6|40,000|8-8|9-9|7-6|7-9|7-0|6-0|5-8|4-7|4-6| |12|2-#4
    1-#6|60,000|10-6|11-9|9-1|9-5|8-5|7-3|6-10|5-7|5-5| |12|2-#5|40,000|10-8|12-0|9-3|9-7|8-7|7-5|6-11|5-6|5-4| |12|2-#5|60,000|12-10|14-5|11-1|11-6|10-4|8-11|8-4|6-7|6-4| |12|2-#6|40,000|12-7|14-2|10-10|11-3|10-2|8-3|7-6|5-6|5-4| |12|2-#6|60,000|DR|DR|DR|DR|DR|DR|DR|DR|DR| |12|Center distance_A_k, l|Center distance_A_k, l|3-2|4-0|2-4|2-6|2-0|1-6|1-4|0-11|0-10| |16|Span without stirrupsi, j|Span without stirrupsi, j|6-5|7-9|5-7|5-10|5-2|4-5|4-2|3-7|3-6| |16|1-#4|40,000|6-2|7-1|5-6|5-8|5-1|4-5|4-2|3-5|3-4| |16|1-#4|60,000|7-6|8-8|6-8|6-11|6-3|5-5|5-1|4-2|4-0| |16|1-#5|40,000|7-8|8-10|6-10|7-1|6-4|5-6|5-2|4-3|4-1| |16|1-#5|60,000|9-4|10-9|8-4|8-7|7-9|6-8|6-3|5-2|5-0| |16|2-#4
    1-#6|40,

  • CRSC § 12-10 Medium relevance — show source text

    (c) Listing by approved listing agency. Listing by an approved listing agency shall not be construed as necessarily indicating compliance in all respects with the requirements of these design requirements and test procedures for single-point latching or locking devices. The test report of the approved listing agency may be filed for review and after evaluation, if it is found to provide evidence of conformance, the single-point latching or locking device may be recognized for approval and listing.

    (d) Definitions.

    1. Inside knob. Inside knob means the knob, lever, bar or paddle on the side of the door which must be turned or depressed to unlatch or unlock the door to permit egress.
    2. Outside knob. Outside knob means the knob on the corridor side of room to corridor doors, or the knob on the exterior side of a door leading to the exterior.

    INSTRUCTIONS

    Sec. 12-10-201. Approved installation instructions shall be provided by the manufacturer. Instructions shall be illustrated and shall include directions and information adequate to ensure proper and safe installation of the device.

    DESIGN

    Sec. 12-10-202.

    (a) Finish. Builders hardware shall have a smooth finish with no sharp or burred edges. Knobs may be knurled or have an abrasive finish for ease of turning or identification as may be required. Strikes shall be plain with curved lip. Strike and lip extending beyond jamb have rounded corners.

    (b) Knob, lever or “T” handle actuated. Single-point latch bolts and/or dead bolts shall be retracted from the strike to release the door by a knob, lever or “T” handle with not to exceed [1] / 4 turn. A thumb piece or thumb turn is not acceptable for this purpose.

    (c) Tested design. Builders hardware single-point latching or locking devices shall be designed to retract the latch bolt and/or dead bolt after application of the horizontal forces and the endurance tests without exceeding the releasing torque specified in 1210-204 (h). (d) Knobs. Knobs shall have a minimum diameter of 2 inches (51 mm) and a maximum diameter of 2 [3] / 4 inches (70 mm). (e) “T” handle. “T” handles shall be oval-shaped and have minimum dimensions of 1 [3] / 4 inch by 1 inch (44 mm by 25 mm) at center portion with 1 [1] / 4 inch (32 mm) projection. (f) Levers. The lever of lever actuated latches or locks shall be curved with a return to within [1] / 2 inch (13 mm) of the door to prevent catching on the clothing of persons during egress.

    (g) Self-releasing knob. The inside knob shall be free at all times. Any locking, stopworks or shut-out mechanism shall not prevent retracting the latch bolt or dead bolt to release the door by turning of the inside knob, or “T” handle, or depressing the inside lever, bar or paddle.

    (h) Dead bolt operation. Operation of the inside knob shall retract both latch bolt and dead bolt simultaneously. The opening in the strike shall be of such dimensions that when the flat of the latch bolt is forced against the edge of the latch hole there shall be no pressure against the side of the dead bolt.

    (i) Springs. Retraction of the latch bolt and/or dead bolt shall not depend on springs. (j) Backset. Backset shall be not less than 2 [3] / 4 inches (70 mm) or more than 5 inches (127 mm).

  • CRSC § 8-7 Medium relevance — show source text

    j|8-7|11-4|8-1|8-5|7-5|6-1|5-9|4-10|4-9| |20|1-#4|40,000|6-5|7-10|6-2|6-4|5-9|4-9|4-6|3-8|3-7| |20|1-#4|60,000|7-10|9-7|7-6|7-9|7-0|5-10|5-6|4-5|4-4| |20|1-#5|40,000|8-0|9-9|7-8|7-11|7-2|5-11|5-7|4-6|4-5| |20|1-#5|60,000|9-9|11-11|9-4|9-8|8-9|7-3|6-10|5-6|5-5| |20|2-#4
    1-#6|40,000|9-0|11-1|8-8|8-11|8-1|6-9|6-4|5-2|5-0| |20|2-#4
    1-#6|60,000|11-0|13-6|10-6|10-11|9-10|8-2|7-9|6-3|6-2| |20|2-#5|40,000|11-3|13-9|10-9|11-1|10-0|8-4|7-10|6-5|6-3| |20|2-#5|60,000|15-8|19-2|15-0|15-6|14-0|11-8|11-0|8-11|8-9| |20|2-#6|40,000|15-5|18-10|14-8|15-2|13-9|11-5|10-9|8-6|8-3| |20|2-#6|60,000|18-7|22-9|17-9|18-5|16-7|13-10|12-9|9-5|9-2| |20|Center distance_A_k, l|Center distance_A_k, l|5-7|8-4|5-1|5-5|4-5|3-1|2-9|1-10|1-9| |24|Span without stirrupsi, j|Span without stirrupsi, j|9-11|13-7|9-9|10-2|9-0|7-5|7-0|5-10|5-9| |24|1-#5|40,000|8-6|10-8|8-5|8-8|7-10|6-6|6-2|5-0|4-11| |24|1-#5|60,000|10-5|13-0|10-3|10-7|9-7|8-0|7-6|6-1|6-0| |24|2-#4
    1-#6|40,

  • CRSC § 13-9 Medium relevance — show source text

    000|13-9|15-10|12-2|12-8|11-5|10-3|9-7|7-11|7-9| |20|2-#5|40,000|14-0|16-2|12-5|12-11|11-7|10-6|9-9|7-11|7-8| |20|2-#5|60,000|16-11|19-6|15-0|15-6|14-0|12-7|11-9|9-1|8-9| |20|2-#6|40,000|16-7|19-1|14-7|15-3|13-1|11-3|10-2|7-11|7-8| |20|2-#6|60,000|19-11|22-10|17-4|18-3|15-6|13-2|11-10|9-1|8-9| |20|Center distance_A_k, l|Center distance_A_k, l|3-11|5-2|3-1|3-3|2-8|2-2|1-11|1-4|1-3| |24|Span without stirrupsi, j|Span without stirrupsi, j|8-2|9-10|7-4|7-8|6-11|6-4|5-11|5-3|5-2| |24|1-#5|40,000|9-5|11-1|8-7|8-10|8-0|7-3|6-9|5-7|5-5| |24|1-#5|60,000|11-6|13-6|10-5|10-9|9-9|8-9|8-2|6-10|6-8| |24|2-#4
    1-#6|40,000|10-8|12-6|9-8|10-0|9-0|8-2|7-7|6-4|6-2| |24|2-#4
    1-#6|60,000|12-11|15-2|11-9|12-2|11-0|9-11|9-3|7-8|7-6| |24|2-#5|40,000|15-2|17-9|13-9|14-3|12-10|11-7|10-10|9-0|8-9| |24|2-#5|60,000|18-4|21-6|16-7|17-3|15-6|14-0|13-1|10-4|10-0| |24|2-#6|40,000|18-0|21-1|16-4|16-11|14-10|12-9|11-8|9-2|8-11| |24|2-#6|60,000|21-7|25-4|19-2|20-4|17-2|14-9|13-4|10-4|10-0| |24|Center distance_A_k, l|Center distance_A_k, l|4-6|6-2|3-8|4-0|3-3|2-8|2-3|1-7|1-6| |For SI: 1 inch = 25.

  • CRSC § 6-1 Medium relevance — show source text

    000|6-1|6-9|5-2|5-4|4-9|3-11|3-9|3-0|2-11| |8|1-#5|60,000|7-4|8-1|6-3|6-5|5-9|4-9|4-6|3-7|3-7| |8|2-#4
    1-#6|40,000|6-10|7-6|5-9|6-0|5-5|4-5|4-2|3-4|3-4| |8|2-#4
    1-#6|60,000|8-2|9-1|6-11|7-2|6-6|5-4|5-0|4-1|4-0| |8|2-#5|40,000|8-4|9-3|7-1|7-4|6-7|5-5|5-1|4-1|4-0| |8|2-#5|60,000|9-11|11-0|8-5|8-9|7-10|6-6|6-1|4-8|4-6| |8|2-#6|40,000|9-9|10-10|8-3|8-7|7-9|6-4|5-10|4-1|4-0| |8|2-#6|60,000|DR|DR|DR|DR|DR|DR|DR|DR|DR| |8|Center distance_A_k, l|Center distance_A_k, l|2-6|3-1|1-10|1-11|1-7|1-1|0-11|0-7|0-7| |12|Span without stirrupsi, j|Span without stirrupsi, j|5-5|6-7|4-7|4-10|4-3|3-5|3-3|2-8|2-8| |12|1-#4|40,000|5-3|6-0|4-8|4-10|4-4|3-7|3-4|2-9|2-8| |12|1-#4|60,000|6-5|7-4|5-8|5-10|5-3|4-4|4-1|3-4|3-3| |12|1-#5|40,000|6-6|7-6|5-9|6-0|5-5|4-5|4-2|3-5|3-4| |12|1-#5|60,000|7-11|9-1|7-0|7-3|6-7|5-5|5-1|4-2|4-0| |12|2-#4
    1-#6|40,000|7-4|8-5|6-6|6-9|6-1|5-0|4-9|3-10|3-9| |12|2-#4
    1-#6|60,000|10-3|11-9|9-1|9-5|8-6|7-0|6-7|5-4|5-3| |12|2-#5|40,

Frequently asked questions

What is the single most important acceptance check after endurance testing?

Confirm that the torque to retract for any four tested latch bolts does not exceed two times the initial average torque recorded for the five samples. § 12‑10‑204 (i).

How many cycles are required for the endurance test in § 12‑10‑204(i)?

Each sample is subjected to 800,000 operating cycles at approximately 10 cycles per minute. § 12‑10‑204 (i).

What are the releasing torque limits after preload?

After applying a 50‑lb horizontal preload (3 in above spindle) and at least 25 unlatchings, the inside knob must require ≤ 30 in‑lb torque and an inside lever must require ≤ 15 lb downward pressure to retract the latch. § 12‑10‑204 (h).

Are roller latches allowed in wood frames?

No — roller‑latch doors are required to be installed in steel frames only, with jambs anchored to prevent spreading; see § 12‑10‑204 (j)(3).

How is coating thickness measured under § 12‑10‑205?

By either (1) cross‑section and microscope measurement or (2) reagent drop test to penetration; alternative corrosion‑resistant processes are accepted by comparative ASTM B‑117 salt‑fog testing. § 12‑10‑205.

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