MIL-DTL-2710C
a. Fit of right and left hand coupling plates on C-link examination.
b. Taper pin engagement examination.
c. Hairpin fit examination.
4.3.1.4 Conformance inspection of each detachable link. After satisfactory completion
of inspections specified in 4.3.1.3, each detachable link of the lot shall be subjected to a proof
test (see 4.5.3) and a finish (paint) inspection (see 4.4.9).
4.3.1.5 Conformance inspection of sample detachable links and components. An extra
detachable link, with hairpin when specified (see 6.2), and plug installed shall be furnished for
each lot for the breaking load test (see 4.5.2). In addition to the extra detachable link for the
breaking load test, an extra C-link and coupling plate (left or right hand) or stock (see 3.4) shall
be furnished for a component specimen tensile test (see 4.5.4).
4.3.1.6 Disposition of chain samples. Test samples and unused samples shall be either
shipped and the finished detachable link retained at the manufacturing facility, or scrapped at the
discretion of the contracting officer. If retention or shipping is desired, each sample shall be
identified.
4.4 Examination methods.
4.4.1 Dimension conformance of detachable link components. The dimensions of each
detachable link component (C-link, coupling plates, taper pin, plug, and hairpin (when specified
see 6.2)) shall be measured. The measurements of each detachable link component shall be as
specified on the applicable drawing specified in 3.7. The C-link and right and left hand coupling
plates shall be remeasured after proof testing. The detachable link shall be rejected if any one of
its components does not conform to the dimensional requirements of 3.7. The plug or hairpin
shall be rejected if it does not conform to the dimensional requirements of 3.7.
4.4.1.1 Measurement of pull draft angles. The measurements of pull draft angles of
C-links and coupling plates of 3/4 through 1-1/2 inch detachable links shall be carried out with
an optical comparator to comply with the requirements in 3.7.1. The pull draft angles of 1-5/8
through 4-3/4 inch detachable links shall be performed with a template capable of measuring pull
draft angles of a maximum of 10 degrees. All measurements of pull draft angles will be made at
90 degree increments.
4.4.2 Surface examination of C-link and right and left hand coupling plates. After
cleaning all surfaces and before proof testing, all surfaces shall be visually examined. After
proof testing and before painting, the surfaces shall be completely inspected using the magnetic
particle method of examination in accordance with ASTM A275/A275M and MIL-STD-2035. If
a surface irregularity, dent, or undercut exceeding the criteria of 3.8 is found on the C-link or
coupling plates surfaces, the detachable link shall be rejected.
4.4.3 Surface examination of taper pin. After cleaning the taper pin, the machine surface
quality of the taper shall be visually examined and compared to a machine surface roughness
gauge made from pure nickel. If the taper pin machine surface quality is less than the
requirement of 3.9, the taper pin shall be rejected.
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