MIL-DTL-6458 Chain Assemblies, Single Leg, Aircraft Cargo Tie DownThis specification covers two types of flight safety critical aircraft cargo tie down chain assemblies. The chains described in this specification are to be used in conjunction with the tie down tensioners described in MIL-DTL-25959, where the Type I chain assembly is to be used with the Type I \(styles A and B\) and Type III tie down tensioners, and the Type II chain assembly is to be used with the Type II \(styles A and B\) and Type IV tie down tensioners.

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MIL-DTL-6458G

3.9 Identification of product. The chain assembly shall be identified by a 2 dimensional

data matrix applied to the hook portion assembly in such a manner as to minimize the potential

for abrasion. The data matrix element shall be a machine-readable information (MRI) marking

that is fully readable by either a fixed or portable reader, and when read by the reader will

provide as a minimum in a clear text display, part number, national stock number (NSN),

contract number and manufacturer's commercial and government entity (CAGE) code. The

information need not be in a Unique Identification (UID) format unless serialization is required.

The data matrix shall be affixed with a quality grade and size as deemed appropriate by the

manufacturer to provide the required information and show no signs of corrosion or abrasion

after being subjected to the salt fog (see 4.5.5), abrasion (see 4.5.6) and the sand and dust testing

(see 4.5.7). (NOTE: Users of this specification should reference MIL-STD-130 for an in-depth

understanding of identification marking and the MRI technology.)

3.10 Workmanship. The chain assembly shall be free from injurious imperfections that

may impair appearance and serviceability. The welded chain shall be free from all surface

discontinuities in accordance with AWS B1.11. Dimensions and tolerances not specified shall

be consistent with standard industry practice.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are

classified as follows:

a. First article inspection (see 4.3).

b. Conformance inspection (see 4.4).

4.2 Test conditions. Unless otherwise specified, all tests required by this specification

shall be made at standard ambient conditions in accordance with MIL-STD-810.

4.3 First article inspection.

4.3.1 First article sample. The first article test sample shall consist of two chain

assemblies of the type required that are representative of the production chain assemblies. The

test samples shall undergo all of the tests specified in section 4.5 at a laboratory designated by

the manufacturer under the supervision of the procuring activity.

4.4 Conformance inspection. Conformance inspection shall be in accordance with

ANSI / ASQ Z1.4 and shall consist of the individual tests (see 4.4.1) for each unit produced, as

well as the periodic sampling tests (see 4.4.2) if required by the procuring activity (see 6.2).

a. Individual tests.

b. Periodic sampling tests.

4.4.1 Individual tests. Each chain assembly shall be subjected to the examination of

product and proof load test (see 4.5.1 and 4.5.2).