MIL-DTL-28731F
3.3.5.2.2 Solder terminations. Solder terminations shall be tin-lead plated in accordance with
SAE-AMS-P-81728, .00010 inch (0.0025 mm) minimum thickness, over a nickel underplate in accordance
with SAE-AMS-QQ-N-290, class 2, 50 microinches (1.27 μm) minimum.
3.3.5.2.3 Crimp terminations. Crimp terminations shall be gold plated, 50 microinches (1.27 μm)
minimum over a nickel underplate in accordance with SAE-AMS-QQ-N-290, class 2, 50 microinches
(1.27 μm) minimum.
3.3.6 Connector shields and clamps. Shields and clamps shall be die-cast aluminum or corrosion-
resistant steel. Die-cast aluminum, if used, shall be in accordance with composition number 13, A13,
A380, or 360 or ASTM B85, and workmanship in accordance with ASTM B85. Sheet metal shall be in
accordance with SAE-AMS-STD-66. All shields and clamps (except nylon strap) shall be plated in
accordance with finish number M225 of MIL-F-14072.
3.3.7 Engaging hardware. All stress bearing hardware shall be type 303 or 416 corrosion-resistant
steel in accordance with ASTM A484/A484M and ASTM A582/A582M. All hardware shall be passivated
in accordance with finish number E300 of MIL-F-14072. Actuating hardware shall be dry film lubricated.
3.3.8 Other hardware. Nonstress bearing hardware shall be type 303 or 416 corrosion resisting steel in
accordance with ASTM A484/A484M and ASTM A582/A582M, or noncorrosion resisting metal parts which
shall be plated with cadmium in accordance with SAE-AMS-QQ-P-416, class 3, type II. All finishes shall
be conductive unless otherwise specified (see 3.1).
3.3.9 Insert material. Unless otherwise specified (see 3.1), insert material shall be a diallyl phthalate in
accordance with ASTM D5948, type SDG-F, GDI-30F, or polyester thermoplastic in accordance with
MIL-M-24519, (reground material shall not be used).
3.4 Design, construction, and physical dimensions.
3.4.1 Connectors (see 3.1). Connectors shall be of the design, construction, and physical dimensions
specified. The temperature range shall be from -65°C to +125°C. The connector shall permit individual
insertion and removal of the contacts with the insertion and removal tools in accordance with 3.4.2.3. Wire
conductors shall be attached to the applicable contacts by crimping, soldering, or wrapping as specified
herein.
3.4.1.1 Insert design. Inserts shall be on one-piece construction and shall be such that they will not
crack, chip, or break in normal service or assembly. Split or hollow inserts glued or bonded together shall
not be used. The insert dimensions and contact hole shall be as specified on the individual specification
sheet. Contacts when assembled in the male or female plug shall be recessed a minimum of .020 inch
(0.51 mm) below the outer protective flange. Contacts when assembled in the female or male receptacle
shall be recessed a minimum of .020 inch (0.51 mm) below the face of the plastic insert.
3.4.2 Contacts. Contact configuration shall be as specified (see 3.1).
3.4.2.1 Contact design. Contact design shall provide for crimp, solder, or wrappost terminations and
shall be designed so they will not be damaged by mating or unmating with the connectors. The contact,
for use in both the plug and receptacle, shall be of the formed blade, fork type. Mating contacts shall be
90° to each other when assembled and provide for positive spring contact wiping action. Each contact
shall contain a means of firmly locking itself when installed in the insert. The locking feature shall be such
that insertion and removable of the contact may be accomplished using tools as specified in 3.4.2.3.
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