MIL-DTL-62567D(AT)
3.2.2.3 Surface finish. The surface texture of a torsion bar shall be as specified on
Drawing 12292010 (see 4.6.3).
3.2.2.4 Preset. The torsion bar shall be preset to the requirements of Drawing 12292010
by twisting one end of the bar in the direction indicated a minimum of three times while
restraining the opposite end. The bar shall be held stationary at full windup for not less than 10
seconds during each preset cycle. The last twist shall result in a change of set angle of not
greater than 1.0 degree from the preceding twist. The degrees of permanent set shall be not
greater than the amount specified on Drawing 12292010 (see 4.6.4).
3.2.2.5 Straightness. Straightness of the torsion bar body shall be controlled as specified
on Drawing 12292010. Stock or bars may be straightened at any time during the machining
sequence as required to meet the drawing requirements for as-machined straightness prior to any
cold working. Note that the drawing straightness control for as-machined torsion bars is tighter
than the final straightness requirement. Bars shall be straightened at a temperature below the
tempering temperature. Care shall be exercised to avoid damage to the surface of the bar during
the straightening operation.
3.2.3 Surface protection.
3.2.3.1 Cleaning. Prior to the application of any protective coating, bars shall be cleaned
in accordance with Drawing 12369003, method I or method II, with no film thickness specified.
3.2.3.2 Priming. The body of the torsion bar shall be primed with primer coating
conforming to Drawing 12369003 with no film thickness specified.
3.2.3.3 Protective covering. A protective covering shall be applied to the body of the bar
in the area shown on Drawing 12292010. This covering shall prevent damage from handling or
shipping such as scratches, nicks or abrasions (see 6.6).
3.2.4 Dimensions. Dimensions and tolerances of the torsion bar shall be as specified on
Drawing 12292010.
3.2.5 Endurance. The torsion bar shall demonstrate a minimum life of 45,000 cycles and
an average life of 80,000 cycles with an angular creep of not greater than 4 degrees and torsional
deflection as specified in table I (see 4.6.5).
TABLE I. Endurance.
Part number
Torsional deflection
12292010
(degrees)
-1, -2
12-71
-7, -8
12-69
4
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