MIL-DTL-12883/3E
Inches
mm
Inches
mm
Inches
mm
Inches
mm
Inches
mm
11.89
.468
3.18
.125
26.29
1.035
1.09
.043
0.05
.002
.563
3.96
.156
28.53
1.125
14.30
1.19
.047
0.13
.005
.625
4.78
.188
30.18
1.188
15.88
1.57
.062
0.25
.010
.745
9.53
.375
35.71
1.406
18.92
2.39
.094
0.36
.014
.940
11.13
.438
23.88
2.77
.109
0.79
.031
NOTES:
1. Dimensions are in inches.
2. Metric equivalents are given for general information only.
3. Unless otherwise specified, tolerance is + .016 inch (0.41 mm) and + ½º on angles.
4. Nine contact cavities equally spaced throughout 288º of arc, and each cavity located within ½º of
true position, shall be established along the pin circle.
5. Each contact tab shall have either:
a. 2 wire holes of .040 inch (1.02 mm) minimum width and .075 inch (1.91 mm) minimum length.
b. 1 hole of .040 inch (1.02 mm) minimum width and .125 inch (3.18 mm) minimum length.
The hole, or holes shall lie on the longitudinal centerline of the contact tab within + .008 inch (0.20
mm).
6. An orientation slot or tongue, or other suitable means to serve as a guide for proper positioning of an
applicable electron tube in the socket contacts, shall be placed on the shield mounting between
contacts 1 and 9.
7. The design of bosses and the shape of barrier, when used, are optional. When present, barriers
shall have a maximum height of .062 inch (1.57 mm).
8. Clearance between the cavity wall and the contact, with the contact in any position, shall be no
greater than .018 inch (0.46 mm).
9. Material thickness of mounting flange shall be measured in an area where burring or dishing of the
mounting hole is not present.
FIGURE 1. Socket configuration Continued.
REQUIREMENTS:
Dimensions and configurations: See figure 1 and table I.
Insulating material: Ceramic, Diallyl Ortho-Phthalate in accordance with ASTM PS 15 type, SDG-F,
GDI-30F, or mineral-filled Phenolic resin in accordance with ASTM D5948 type MFE, see table I.
Contact cavities: One shape only, either D-shaped or circular, at option of the manufacturer.
Float: With a pin of .041 inch (1.04 mm) diameter and .271 inch (6.88 mm) minimum length fully
inserted in a socket contact, the contact shall be capable of free movement (float) within the contact
cavity.
Saddle (with shield base): The saddle shall be integral with the shield base. The method of attaching
the saddle (with shield base) to the insulator body, and the shape of the saddle (with shield base)
where attachment is effected, are optional.
2
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