A-A-55619C
2.2.7 Metal wheel. Metal wheel shall be fine grain cast iron, steel or aluminum alloy.
2.2.8 Swivel lock. When specified, a four position plunger type swivel lock with a ring for operation shall
be furnished. When engaged, the ring shall be in the vertical position and the swivel lock shall prevent the
caster from swiveling while rolling or shall prevent rolling while at right angles to the normal path of the
equipment. When disengaged, the ring shall be in the horizontal position and the swivel lock shall permit
full 360 free swiveling.
2.2.9 Brake. When specified, a manually operated with side or front mounted control lever parking brake
shall be provided. The brake shall be tread contact type, using a combination of pressure and friction to
prevent wheel rotation. The control lever shall be readily accessible for operation, permitting quick and
easy brake application and release. The control lever shall be capable of ensuring brake contact surface has
a clearance of at least .062 inch off the wheel tread surface.
2.2.10 Lubrication fitting. The swivel assembly and wheel assembly shall have pressure lubrication fittings
and shall be prelubricated with water repellent grease having a -32C to +71C (-10F to +160F) operating
temperature range.
2.2.11 Electrical Conductivity. The electrical conductive wheels shall be of such composition that the average
electrical resistance shall be less than 250,000 ohms, and the maximum individual electrical resistance reading
shall be less than 1,000,000 ohms when tested as described in 2.3.4.
2.3 Casters furnished shall be able to withstand the following tests:
2.3.1 Static load test. The caster shall be able to withstand four (4) times its rated capacity for one (1) minute
minimum without damage.
2.3.2 Endurance test. The casters shall be loaded to rated capacity and shall be run continuously (see 6.3) at
three (3) mph minimum on an endless belt or drum type testing machine with a smooth, uninterrupted running
surface for a minimum period of forty (40) hours. At the completion of the test, there shall be no indication of
excess wear on the bearing races, looseness of bearings, scuffing of tires, or looseness of tire tread.
2.3.3 Brake Test. For caster furnished with a brake, the brake must prevent wheel rotation from a horizontal
pulling force equal to 103 percent (%) of the force required to initiate movement of the equipment under rated
load with brakes disengaged. The test results shall be conducted on a level concrete floor by applying a
horizontal pulling force on a rated load evenly distributed over four (4) casters, two of which will have the
brakes engaged. The test should be repeated a minimum of four (4) times.
2.3.4 Electrical Conductivity Test. For caster furnished with electrical conductive tread, the wheel shall be
tested while supporting a load equal to 25 percent (%) of its rated load. The caster to be tested shall be rolled
onto a clean, dry, flat metal plate. The metal plate and the metal parts of the caster shall form the electrodes
for the test. If the caster is tested while supporting equipment, all other casters under the equipment shall be
insulated from the floor on which the metal electrode plate is placed. The resistance between the electrodes
shall be measured by any resistance measuring apparatus of suitable range, which has an open circuit direct
voltage (D.C.) of approximately 500 volts. For the safety of the operator, the maximum current, which can be
delivered by the apparatus through a resistance of 500 ohms, should be less than 10 milliamperes.
Measurements shall be made with 5 separate areas of the tire successively in contact with the plate, and the
average and the maximum values shall be determined.
3. REGULATORY REQUIREMENTS.
3.1 The offerer/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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