MIL-DTL-917F(SH)
h.
Part attachment and mounting shall be in accordance with IPC-2221 except as follows:
(1) Parts for mounting on circuit boards shall be such that the part's operating surface temperature does
not exceed 212 °F (100 °C) under the printed wiring assembly worst case uncoated operating conditions.
(2) Axial-leaded parts attached to standoff terminals shall be mounted in accordance with IPC-2221 and
the following: Parts having axial pigtail leads and not requiring body clamps shall be secured between solder-type
terminals. The distance between terminals (center-to-center) shall be equal to, or greater than, the distance equal to
the sum of, (a) the maximum size (including tolerance) of the part, (b) the shank diameter of the terminal, and
(c) 3/8 of an inch. Unless otherwise required to achieve component lead stress relief, parts shall be centered between
terminals in accordance with good workmanship; where terminal spacing approaches the minimum clearance, parts
shall be centered between the terminals to ±1/32 inch. Guidance for provisions for stress relief and component lead
bends and lead radii can be found in MIL-HDBK-454 and shall be made on all conductors.
(3) Transistors and integrated circuits with pigtail leads having one or more leads terminating at standoff
terminals shall be held in place by means of clamps. Clamps shall also be provided if the device surface from which
the leads project is not parallel to and toward the board surface.
3.13.27 Non-repairable assemblies. A group of electrical or electronic parts may be packaged as a
non-repairable assembly upon compliance with the requirements herein. A non-repairable assembly is intended to
be discarded in case of failure. All parts of non-repairable assemblies shall meet the specifications set forth herein.
3.13.27.1 Non-repairable assemblies with printed wiring. When non-repairable assemblies have printed
wiring, the requirements of 3.13.26a through 3.13.26d shall apply, except for the marking of circuit part
designations, polarities, and connection points.
3.13.28 Springs. Compression and extension type helical springs (including garter springs) shall be
manufactured in accordance with SAE-AS13572.
3.13.29 Magnetic brakes. Magnetic brakes shall be in accordance with MIL-B-16392.
3.14 Processes.
3.14.1 Treatment and processing of metals for corrosion resistance. Parts made of ferrous metal (except
corrosion-resistant metal listed in 3.3.2.3) or of aluminum shall be treated, coated, plated, and painted, as applicable
in accordance with tables XXI and XXII. Treatment and processing shall not adversely affect the parts for the uses
intended. All fabricating operations, such as welding, machining, drilling, and tapping shall have been
accomplished prior to treating, coating, plating, or painting except that paint may be removed from tapped holes.
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