257-255
Jam Nut Mount Hermetic Receptacle
with Crimp Removable Socket Contacts,
MIL-DTL-38999 Series I Type
MIL-DTL
38999 Type
Basic
Number
Shell Size
Table I
Alternate Key
Position
A, B, C, D, E
(N = Normal)
B
257-255
Z1
9
-
35 N
Insert Arrangement
Per MIL-STD-1560
Material and Finish
Z1
- CRES, Passivated
Pin contact
interferance
Master
key
B dia
.920
.910
1.695 max
O-
Ring
5
90° 185°
C
D
flat
120° typ
H
thread
A
thread
C
Jam nut
E
.125 max
panel
.219
min
APPLICATION NOTES
1.
2.
3.
4.
Assembly identified with manufacturer’s name and part number,
space permitting.
Insert arrangements in accordance with MIL-STD-1560.
Glenair 257-255 receptacle connector is designed to mate with any
QPL manufacturer’s MIL-DTL-38999 Series I plug connector having
the same insert arrangement & polarization.
Material/finish:
Shell, jam nut—CRES/passivated
5.
6.
Pin contacts—nickel-iron alloy 52/gold
Socket contacts—copper alloy/gold
Insulator—fused vitreous glass/N.A.
Insulators—high grade rigid dielectric/ N.A.
Seals—pure fluorosilicone rubber/ N.A.
Supplied crimp removal socket contacts conform to
M39029/57
Metric Dimensions (mm) are indicated in parentheses.
© 2009 Glenair, Inc.
www.glenair.com
CAGE CODE 06324
Printed in U.S.A.
E-Mail: sales@glenair.com
GLENAIR, INC.
•
1211 AIR WAY
•
GLENDALE, CA 91201-2497
•
818-247-6000
•
FAX 818-500-9912
B-18
with Crimp Removable Socket Contacts,
MIL-DTL-38999 Series I Type
F
dia
HERMETIC LEAK RATE MOD CODES
Designator
–585A
–585B
–585C
Required Leak Rate
1 x 10
-10
cc’s Helium per second
1 x 10
-9
cc’s Helium per second
1 x 10
-8
cc’s Helium per second
G
Recommended Panel Cut-Out
TABLE I: CONNECTOR DIMENSIONS
SHELL
SIZE
9
11
13
15
17
19
21
23
25
A THREAD
CLASS 2A
.6875-24 UNEF
.8125-20 UNEF
1.000-20 UNEF
1.125-18 UNEF
1.250-18 UNEF
1.375-18 UNEF
1.500-18 UNEF
1.625-18 UNEF
1.750-18 UNS
B DIA
±.016(0.4)
1.188(30.2)
1.375(34.9)
1.500(38.1)
1.625(41.3)
1.750(44.5)
1.938(49.2)
2.062(52.4)
2.188(55.6)
2.312(58.7)
C FLATS
±.016(0.4)
1.062(27.0)
1.250(31.8)
1.375(34.9)
1.500(38.1)
1.625(41.3)
1.812(46.0)
1.938(49.2)
2.062(52.4)
2.188(55.6)
D FLAT
±.005(0.1)
.650(16.5)
.750(19.1)
.937(23.8)
1.061(26.9)
1.186(30.1)
1.311(33.3)
1.436(36.5)
1.561(39.6)
1.686(42.8)
TABLE I (CONTINUED): CONNECTOR DIMENSIONS
SHELL
SIZE
9
11
13
15
17
19
21
23
25
E DIA
±.016(0.4)
.109(2.8)
.109(2.8)
.109(2.8)
.109(2.8)
.140(3.6)
.140(3.6)
.140(3.6)
.140(3.6)
.140(3.6)
F DIA
±.005(0.1)
.705(17.9)
.827(21.0)
1.012(25.7)
1.139(28.9)
1.264(32.1)
1.389(35.3)
1.512(38.4)
1.639(41.6)
1.764(44.8)
G
±.005(0.1)
.665(16.9)
.764(19.4)
.950(24.1)
1.079(27.4)
1.203(30.6)
1.328(33.7)
1.454(36.9)
1.579(40.1)
1.704(43.3)
H THREAD
CLASS 2A
.4375-28 UNEF
.5625-24 UNEF
.6875-24 UNEF
.8125-20 UNEF
.9375-20 UNEF
1.0625-18 UNEF
1.1875-18 UNEF
1.3125-18 UNEF
1.4375-18 UNEF
© 2009 Glenair, Inc.
www.glenair.com
CAGE CODE 06324
Printed in U.S.A.
E-Mail: sales@glenair.com
GLENAIR, INC.
•
1211 AIR WAY
•
GLENDALE, CA 91201-2497
•
818-247-6000
•
FAX 818-500-9912
B-19
MIL-DTL
38999 Type
257-255
Jam Nut Mount Hermetic Receptacle
B
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