MIL-DTL-2710C
TABLE I. C-link and coupling plates material.
Detachable link classification
ASTM A322, grade
Type I, Class 3
8637
3/4 inch through and including 1-1/2 inch
or
4340
Type II
Number 2 and number 3
Type I, class 1
1-7/8 inch and over
Type I, class 2
4340
2-3/4 inch, 3 inch, and 3-1/2 inch
or
8640
Type I, class 3
1-5/8 inch and 1-3/4 inch
Type II
Number 4 through and including number 8
3.2.3 Plug. The plug shall be cast from antimony alloy and lead.
3.2.3.1 Plug material chemical composition. The chemical composition of the plug shall
be 8 ±0.5 percent antimony alloy and the remaining element shall be lead (see 4.5.1).
3.2.4 Hairpin. The hairpin, when specified (see 6.2), shall be formed from stainless
steel wire, type 304 or 303, condition A, conforming to ASTM A580/A580M or
ASTM A581/A581M, respectively.
3.2.4.1 Hairpin material chemical composition. The chemical composition of the
stainless steel of the hairpin shall conform to the chemical composition of type 304 of
A580/A580M or type 303 of ASTM A581/A581M (see 4.5.1).
3.2.5 Recovered materials. Unless otherwise specified herein, materials incorporated in
the products covered by this specification shall be new and may be fabricated using materials
produced from recovered materials to the maximum extent practicable without jeopardizing the
intended use. The term "recovered materials" means materials which have been collected or
recovered from solid waste and reprocessed to become a source of raw materials as opposed to
virgin raw materials. None of the above shall be interpreted to mean that the use of used or
rebuilt products is allowed under this specification unless otherwise expressly specified.
3.3 Heat treatment. C-link and coupling plates shall be heat treated above the upper
transformation temperature, at a combination of temperature and time to produce a fine grain
structure throughout the component and produce a minimum tensile strength of 170,000 pounds
per square inch (lb/inČ) (Brinell hardness 341 to 375, or direct equivalent in accordance with
ASTM A370 (see 6.4)). The components shall not be heated more than twice. Heat treatment
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