257-410
Metal or Composite Ground Plane Twinax Connector
8GA • MIL-DTL-38999 Series III Type
Twinax and
Quadrax
Connectors
Basic Part Number
257-410
-
D38999 Series III Type
Twinax Connector
Finish Material
(See Table II)
Ground Plane
Option
G
= Outer Contacts
Grounded to Shell
––
= Standard Insulated
Contacts
Shell
Size
Insert Designator
P
= Pin Insert
S
= Socket
A
= Less Pin Contacts/
Grommet Followers
B
= Less Socket Contacts/
Grommet Followers
257-410
XM
06
-
25
-
G
08
P
N
Connector Style
06
= Plug
Insert Arrangement
Dash Number
(See Page D-37)
(N for Normal)
Alternate Key
Position
A, B, C, D, or E
Knurl Mfg's Option
Master Key
Blue Color Band
(See Note 5)
See Note 2
1.220 (31.0)
Max
Grommet Follower For
M17/176-00002 Cable
(See P/N Development)
Ref: Jacket OD.129 ±.005
E
See Notes 3 and 4
Ø A Max
Ø B Max
C Thread
2.000 (50.8) Max
25-8 Only
APPLICATION NOTES
1.
Material/Finishes:
Plug barrel/Coupling nut - See Table II.
(Composite coupling is unplated).
Insulator - Aluminum alloy/Conductive plate
or high-grade thermoplastic.
Contact retainer clips - HT BeCu/Conductive plate.
Seals - Fluorosilicone/N.A.
Assembly to be identified with Glenair’s name, partnumber
and date code, space permitting.
Insert arrangements are in accordance with MIL-STD-1560
(See page D-37).
4.
5.
6.
7.
Insert arrangement shown is for reference only.
Blue color band indicates rear release retention system.
Ground plane performance: per Table II, between outer
contact and plug barrel (see part number development).
For P and S, plug is supplied with contacts P/N M39029/90-
529 (Pin) or M39029/91-530 (Socket) and Grommet Follower
P/N 687-643-8-1 (No spares/sealing plugs provided).
Metric dimensions (mm)are in parentheses.
2.
3.
8.
© 2010 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
E-2
8GA • MIL-DTL-38999 Series III Type
TABLE I: SHELL SIZE
Shell
Size
09
21
23
25
A Dia
Max
.811 (20.6)
1.594 (40.5)
1.720 (43.7)
1.843 (46.8)
B Dia
Max
.858 (21.8)
1.642 (41.7)
1.768 (44.9)
1.890 (48.0)
C Thread
M12 x 1.0-6g 0.100R
M31 x 1.0-6g 0.100R
M34 x 1.0-6g 0.100R
M37 x 1.0-6g 0.100R
TABLE II: MATERIAL/FINISH and GROUND PLANE
Sym
M
NF
XM
XW
Material
Aluminum
Composite
Finish
Electroless Nickel
Cadmium O.D. Over Electroless Nickel
Electroless Nickel
Cadmium O.D. over Electroless Nickel
Consult Factory for Additional Plating Options
Ground Plane
1 mV
2.5 mV
3.0 mV
3.0 mV
© 2010 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
E-3
Twinax and
Quadrax
Connectors
257-410
Metal or Composite Ground Plane Twinax Connector
E
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