MIL-DTL-6458G
4.4.2 Periodic sampling tests. The periodic sampling tests shall be in addition to the
individual tests and shall consist of the tests specified in 4.5.3 and 4.5.4. The manufacturer shall
select the type of sampling plan in accordance with ANSI /ASQ Z1.4. The sample size shall be
selected in accordance with general inspection level I.
4.4.3 Rejection and retest. Failure of any item being tested and inspected will postpone
final acceptance until the cause of rejection has been investigated and corrected for the entire
contract quantity. Other than marking and minor workmanship issues as determined by the
Government, items that have been tested and failed shall be discarded and not be reworked or
delivered as part of any end item lot. If a new production lot is required, the lot will be tested
using a tightened sample size in accordance with general inspection level II of ANSI / ASQ Z1.4.
4.5 Test methods.
4.5.1 Examination of product. Each chain assembly shall be inspected to determine
compliance with the requirements specified herein with respect to material, dimensions, weight,
protective coating, weld quality, marking and workmanship.
4.5.2 Proof load test. Each chain assembly shall be tested with the static load specified
in 3.6.1 applied to the grab hook and chain links for 30 seconds without permanent deformation
or damage when wrapped around a 6-inch diameter bar with the hook fastened into a link
maintaining an included angle of 30 ± 5 degrees.
4.5.3 Ultimate load test. Each sample chain assembly shall be subjected to the design
strength test in accordance with the procedure in 4.5.2, except that the static load requirements
shall be as specified in 3.6.2.
4.5.4 Hook test. Each sample chain assembly of the same type shall be joined as
specified in 3.4 and subjected to a load equivalent to the design strength. The hook and
adjoining links shall be examined under full load for positive engagement. There shall be no
evidence of slippage or impending failure of the hook, coupling link, or chain.
4.5.5 Salt fog (spray) test. The first article sample chain assembly shall be subjected to
salt fog (spray) test in accordance with MIL-STD-810. After completion of the test, the chain
assembly shall show no evidence of rust or corrosion as specified in 3.6.3.
4.5.6 Abrasion test. The first article sample chain assembly and hook shall be subjected
to being dragged across a concrete surface constructed using Portland Cement in accordance
with ASTM C150/C150M. The dragging shall be conducted by securing the chain end of the
assembly and pulling the hook end across the surface continuously at various angles and speeds
including twists and turns for 30 minutes. The chain assembly and hook shall then be dragged
through a sand pit in a similar manner as over the concrete floor for another 30 minutes. The
sand composition shall be silica sand in accordance with MIL-STD-810 Method 510.5 and size
No. 40 or larger in accordance with ASTM C-778. At the conclusion of the test, the 2
dimensional data matrix shall show no evidence of damage or abrasion and shall be readable by
both the portable and fixed readers.
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