MIL-DTL-24251/6E
TABLE 1. Characteristics.
Dash
Heat dissipation
A
B
C dia
Weight
Tube envelope
Tube
±.015
no.
temp. reduction
-.062
grams
socket
Style
Length
in °C (minimum)
(1.57)
Max
max
ref
2/
nom
(0.38)
1
25
1.500
1.625
.875
11.0
T-5 1/2
1.125
(38.10)
(41.28)
(22.23)
(28.58)
MIL-DTL-12883/2
2
40
2.000
2.125
.875
15.0
T-5 1/2
1.500
(50.80)
(53.98)
(22.23)
(38.10)
3
45
2.500
2.625
.875
19.0
T-5 1/2
2.000
(63.50)
(66.68)
(22.23)
(50.80)
4
25
1.500
1.625
1.000
12.0
T-6 1/2
1.125
MIL-DTL-12883/3
(38.10)
(41.28)
(25.40)
(28.58)
5
55
2.000
2.125
1.000
16.0
T-6 1/2
1.562
(50.80)
(53.98)
(25.40)
(39.67)
6
45
2.500
2.625
1.000
20.0
T-6 1/2
2.000
(63.50)
(66.68)
(25.40)
(50.80)
7 1/
45
2.750
2.875
1.000
22.0
T-6 1/2
2.812
(69.85)
(73.03)
(25.40)
(71.42)
1/ This shield is for use with noval tubes which are longer than usual tubes.
2/ Not recommended for new design.
REQUIREMENTS:
The shield, locking mechanism, liner, and other parts shall be designed to meet the requirements in MIL-DTL-
24251, and to fit the tube envelope and tube socket specified in table I.
Dimensions and configuration: See figure 1 and table I. No special retainer (base) or adapter will be permitted.
Material:
Spring (when used): Beryllium copper, ASTM-B194, ASTM-B196/B196M and ASTM-B197/B197M.
Shell: Aluminum alloy, SAE-AMS-QQ-A-250 (aerospace and unspecified applications), or ASTM-B209 (non-
aerospace applications).
Liner: Beryllium copper, ASTM-B194.
Finish:
Spring (when used): Black cadmium plate, SAE-AMS-QQ-P-416, class 1, type II.
Shell: Black anodize, type II in accordance with MIL-A-8625, black matte in accordance with MIL-DTL-5541,
optional finish: Henderlube or equal.
Liner: Black cadmium plate, SAE-AMS-QQ-P-416, class 3, type II, optional finish: Henderlube or equal.
Construction: The spring shall be held in place by friction or by mechanical means if the maximum diameter is
smaller than the inside diameter of the shield. The tension shall be such as will insure maximum compression
of .125 inch (3.18 mm) over seated tube. The force required to compress spring to .375 inch (9.53 mm) shall be
within 1.5 to 2.5 pounds. Spirals shall not touch each other. The end of the coil spring shall not contact the
electron tube envelope.
Installation force shall not exceed 20 pounds.
Engaging torque: 20 inch-pounds maximum.
2