A-A-55617C
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
brake disengaged. The test 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).
4. PRODUCT CONFORMANCE PROVISIONS.
4.1 Product conformance. The products provided shall meet the salient characteristics of this commercial item
description, conform to the producer's own drawings, specifications, standards, and the quality assurance practices,
and be the same product offered for sale in the commercial market. The government reserves the right to require
proof of such conformance.
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