MIL-DTL-2710C
records shall be made available for inspection and shall include time and temperature,
quenching, stress relieving, and cooling method.
3.4 Mechanical properties. The unmachined C-link and coupling plate samples shall be
sectioned for determination of the tensile strength specified in 3.3. If it is impracticable to take
specimens from finished components, the specimens may be taken from stock of the same heat
or melt of steel.
3.5 Brinell hardness - C-link and right and left hand coupling plates. The Brinell
hardness shall be established for a first article sample of the C-link and coupling plates in
accordance with 4.5.6.
3.6 Brinell hardness - taper pin. The finished taper pin surface shall have a Brinell
hardness of 350 (minimum) (see 4.5.5).
3.7 Dimensions. Dimensions and tolerance for type I and type II detachable link
components shall be in accordance with the drawings specified below (see 4.4.1):
a. Type I, class 1 and class 2 - Drawing 803-860062.
b. Type I, class 3 - Drawing 803-921790.
c. Type II - Drawing 803-6397316.
3.7.1 Pull draft angles, C-link and coupling plates. All pull draft angles of C-links and
coupling plates of detachable links shall be measured in accordance with 4.4.1.1. The pull draft
angle limits shall be 3 degrees minimum and 10 degrees maximum. Draft angles greater than
10 degrees will not be acceptable and the link shall be rejected.
3.8 C-link and coupling plate surfaces. Flashing, burrs, irregularities, and rough edges
shall be contour ground to a fair surface. No surface shall be ground after proof test of the
detachable link. The forgings shall be free from surface irregularities, dents, and undercutting in
excess of the amounts specified in table II (see 4.4.2).
TABLE II. Allowable surface defects of forgings.
Detachable link size
Allowable surface
defect
Type I
Type II
(inches)
(inches)
(size no.)
3/4 to 1-1/2
1/32
Numbers 2 to 4
1-5/8 to 2-1/2
1/16
Numbers 5 and 6
2-5/8 to 3-1/2
3/32
Numbers 7 and 8
1/8
3-5/8 to 4
-
-
5/32
4-3/4
3.9 Taper pin surface. The taper pin machine surface quality shall be in accordance with
the applicable drawing specified in 3.7 (see 4.4.3).
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