A-A-52480A
3.3.2 Ratchet lock (Type II). Type II assembly (figure 2) shall possess the capability of being
pulled outwards into locked positions, at not more than 0.125 in. intervals, without turning the
handle. Unlocking is necessary only to actuate inward and shall require a 1/4 to 3/4 turn of the
handle to the right or left. The assembly shall withstand a maximum pull load of 75 lb. With a
minimum conduit bend radius of 3 in., the assembly shall function smoothly with up to a 20 lb
push-pull actuating force.
3.3.3 Vernier adjust (Type III). Type III assembly (figure 3) shall use a push-button lock release
mechanism to provide coarse adjustment throughout the entire travel range and a knob for fine
adjustment to the coarse setting. This vernier adjustment shall automatically become operable
when the coarse adjustment button is released. The assembly shall withstand a maximum pull
load of 75 lb. With a minimum conduit bend radius of 3 in., vernier adjustment shall be capable
with a maximum force of 10 inch-pounds (in-lb).
3.3.4 Turn-to-lock (Type IV). Type IV assembly (figure 4) shall possess the capability of
push-pull actuation throughout its entire travel length until it is locked into position with a
1/4 to 3/4 turn of the handle to the right or left. The locking positions shall be set at not more
than 0.125 in. intervals. The assembly shall withstand a maximum pull load of 75 lb. With a
minimum conduit bend radius of 3 in., the assembly shall function smoothly with up to a 20 lb
push-pull actuating force.
3.3.5 Lock holding ability (Type II, III, and IV). These assemblies shall not allow core
movement of more than 0.031 in. after application of an 8 ounce (oz) load in alternating
directions along the horizontal axis of the core, away from and towards the control handles, for
a complete test cycle of 50 times in each direction. There shall be no change of pre-set control
adjustment positions nor damage to the control assemblies.
3.3.6 Conduit classes. These four push-pull control assemblies shall use one of two classes of
conduit respectively (see figures 1 through 4).
3.4 Surface treatments. Unless otherwise specified (see 7.3), handles and cover plates shall be
painted green 383 according to the Army Drawing 12369000, Chemical Agent Resistant
Coatings (CARC) Paint System Index.
3.5 Identification and markings. Identification and markings shall be permanent, legible and
shall include as a minimum, the manufacturer's identification code (CAGE), the contract
number, and the Part or Identification Number (PIN) (see 7.1).
4. REGULATORY REQUIREMENTS. The offeror/contractor is encouraged to use recovered
materials to the maximum extent practicable, in accordance with paragraph 23.403 of the Federal
Acquisition Regulation (FAR).
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