MIL-DTL-83505B
S P R IN G C O N T A C T
IN S ID E S U R F A C E O F
BEVELLED,
C O N T A C T (IN T E R F A C E
CHAMFERED OR
W IT H C O M P O N E T L E A D )
TAPERED EN TR Y
.0 2 0 M IN G O L D
R E T E N T IO N M E A N S
(D E S IG N O P T IO N A L )
S E E D E T A IL A
O U TER SLEEVE
.0 2 0 M IN G O L D
CO M PLETE G O LD
CO VERAGE
D E T A IL A
T E R M IN A L
(1 T IN E )
FIGURE 2. General configuration.
3.3.3.2 Spring contact finish. The spring contact finish shall be gold in accordance with ASTM B488, type 2, code C, class 0.76
(30 microinch) minimum thickness. Finish shall be applied over a nickel, in accordance with AMS-QQ-N-290, underplate
thickness 30 - 150 microinch (0.76 - 3.81 µm). The spring contact finish shall be applied overall or localized (see 3.3). When
contacts are provided in strip form, the absence of plating in the area where the contact was removed from the strip is acceptable,
provided it is a non-functional area and any corrosion formed as a result of salt spray testing does not creep into the contact
engaging area. When a localized finish is used the finish and underplate shall be as specified above but the location of the finish
shall conform to detail A of figure 2 (see 3.1 and 3.3.2).
3.3.3.3 Outer sleeve (including termination). The sleeve and termination portion of the socket shall be made of brass in
accordance with ASTM B16 or copper in accordance with Copper Development Association Alloy C11000.
3.3.3.4 Outer sleeve (including termination) finish. The finish for the sleeve shall be one of the following as specified (see 3.1).
a Gold plating shall be in accordance with ASTM B 488, type 2, code C, class 0.51 (20 microinch) minimum thickness, over
nickel, in accordance with QQ-N-290, thickness 30 - 150 microinches (0.76 - 3.81 µm) (see 3.3).
b. Tin-lead in accordance with AMS-P-81728, minimum thickness of 180 microinches (4.57 µm) over nickel, in accordance with
AMS-QQ-N-290, thickness of 30 -150 microinches (0.76 - 3.81 µm), or copper. For printed circuit termination's (type II), the
tin-lead finish shall be 50 to 70 percent tin; for all other termination's, the tin-lead finish shall be 5 percent minimum lead. For
tin-lead finished copper sleeves, nickel or copper underplate is not required (see 3.3).
3.4 Design and construction. Sockets shall be of the design, construction, and physical dimensions specified (see 3.1). The entry
to the socket shall be beveled, chamfered or tapered to facilitate the engagement of the component lead into the socket, except type
VI socket. The lead socket sleeve and terminal shall be of machined one-piece construction. The material shall be brass in
accordance with ASTM B16. The body shall provide a means of retention to a mounting board as specified (see 3.1) and figure 2.
3.4.1 Temperature rating. Part or Identifying Number (PIN) applicable to tin finishes shall have a temperature rating of -40°C to
+105°C. Unless otherwise specified (see 3.1) PIN's applicable to gold finish (plating or inlay) contact engagement area shall have a
temperature rating of -55°C to +125°C.
3.4.2 Wire termination. Unless otherwise specified wire terminations shall conform to figure 1 and shall be as specified (see 3.1).
3.4.2.1 Solderable terminals. Terminals intended for soldering shall be designed so that there shall be no solder wicking into the
lead engagement chamber.
3.4.2.2 Solderless wrappost geometry (type I). The solderless geometry shall be in accordance with figures 3 and 4.
4
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