MIL-DTL-83503C
3.3.3.3.1 Localized finish (selective plating). Selectively plated contacts must have a transition area
between the Au and Sn-Pb of nickel to avoid overlap and resultant embrittlement.
3.3.3.3.1.1 Contact mating area. Contact mating area shall be gold in accordance with ASTM B488,
type II, code C, class 1.25 (50 micro-inches) minimum thickness (see 3.3.1), over nickel 30 to 150 micro-
3.3.3.3.1.2 Insulation displacement contact (IDC) - wire termination area. Shall be gold in accordance
with ASTM B488, type II, code C, class 1.27 (50 micro-inches, or ASTM B488, type II, code C, class 0.25
10 micro-inches minimum thickness (see 3.3.3.2 for purity and hardness), or tin-lead in accordance with
SAE-AMS-P-81728, 100 micro-inches (2.54 µm) thick minimum (see 3.1).
3.3.3.3.1.3 Termination area.
3.3.3.3.1.3.1 Solderless wrappost. Shall be gold in accordance with ASTM B488, type II, code C, class
1.27 (50 micro-inches) minimum thickness (see 3.3.3.1), or tin-lead in accordance with
SAE-AMS-P-81728, 100 micro-inches (2.54 µm) inch thick minimum (5 percent minimum lead) (see 3.1).
3.3.3.3.1.3.2 Solder tail. Shall be gold in accordance with ASTM B488, type II, code C, class 1.27 (50
micro-inches (2.54 µm) thick minimum (5 percent minimum lead) (see 3.1).
3.3.3.3.1.4 Terminations intended for socket contact engagement. Shall be gold in accordance with
3.3.3.3.1.5 Nonfunctional areas. Any portion of the contact other than the contact or termination area
shall be gold, tin/lead (50 to 95 percent minimum tin), or nickel plated 30 to 150 micro-inches (0.76 to
3.3.4 Grommets and seals. Sealing materials shall be of a resilient dielectric material capable of
meeting the performance requirements of this specification.
3.3.5 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall
not be employed in intimate contact with each other in connector or in mated pairs of connectors
conforming to this specification. Dissimilar metals are defined in MIL-STD-889.
3.3.6 Inserts. Insert material shall be of a suitable high grade dielectric material capable of meeting the
performance requirements of this specification.
3.3.7 Hardware. Mounting and mating hardware shall be corrosion resistance steel in accordance with
3.4 Design and construction. Connectors shall be of the design, physical dimensions, and construction
specified to withstand the handling and maintenance expected in installation and normal service use and
to comply with the requirements specified herein (see 3.1).
3.4.1 Contacts. The contacts shall be designed to prevent damage to the active member if improperly
mated. The contact shall incorporate a wiping action.
3.4.2 Inserts. Inserts shall be designed and constructed with proper sections and radii so that they will
not chip, or break in assembly or in normal service. Insert shall be designed so as to positively retain
contacts.
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