RR-S-550 Sockets, Wire RopeThis specification covers mechanical sockets for mechanical wire ropes use in rigging, hoisting, towing, stowage excavating, logging and stump removing equipment, and marine applications.

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RR-S-550E

4.7.3 First article samples. Samples shall be random and representative of the construction, workmanship, components, and materials to be used during production. When a manufacturer is in continuous production of the shackles from one contract to another, submission of additional first article samples for a new contract may be waived at the discretion of the acquiring activity (see 6.2).

4.7.3.1 First article information. Upon completion of first article inspection, the Government activity responsible for conducting the inspection program (see 6.2), shall report the results of the inspection, with appropriate recommendation, to the contracting officer. Approval of the first article samples or the waiving of first article inspection does not preclude the requirements for performing conformance inspection.

4.7.3.2 Disposition of samples. First article samples shall be furnished to the Government as directed by the contracting officer (see 6.2).

4.8. Successful manufacturers. Manufacturers that have successfully passed first article inspections and are continuously producing shackles to this specification, on going inspections shall consist of conformance inspection (see table lX). If first article is waived due to prior successful first article inspection  the manufacturer's in-house inspection procedures shall continue to be used. Results may be requested by government as part of a contract.

TABLE lX. Conformance.

4.8.1 Inspection lot.

4.8.1.1 Lot and sample. The inspection lot shall be product selected at random from the production lot without regard to quality and shall be the sample size specified in table X.

TABLE X. Lot and sample size.

4.8.2 Tests.

4.8.2.1 Visual and mechanical. Perform a visual and dimensional check in accordance with 3.7

4.8.2.2 Magnetic particle inspection.  All type A and B, finish 1, class 2 sockets shall be magnetic particle inspected in accordance with 3.6.

4.8.2.3 Chemical analysis certification. Manufacturers shall supply certification of material supplied in accordance with 3.4

4.8.2.4 Tensile  test. The preparation of the test specimens and the testing methods shall be conducted in accordance with the requirements of ASTM A370. Failure of one test specimen to conform to the required tensile strength as required in 3.1.1 shall be cause for rejection of lot.

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