MIL-DTL-38999 Series III Connectors

Amphenol MIL-DTL-38999 Series III Circular Connectors deliver high-performance capabilities for demanding general duty and harsh environment applications. Developed to operate under severe high temperature and vibration, the connectors feature rapid coupling via a Tri-Start™ thread, shell-to-shell, or metal-to-metal bottoming. Amphenol designed these connectors to provide an EMI shielding capability of 65dB minimum at 10GHz and corrosion resistance of up to 500-hour salt spray exposure. Amphenol MIL-DTL-38999 Series III Circular Connectors offer a rated current range of 1.5A to 5A, a temperature range of -65°C to +175°C, minimum insulation resistance of 5000MΩ, and a dielectric withstanding voltage of 1000VRMS. These rugged and highly reliable circular connectors are ideally suited for industrial, commercial air, military, C4ISR, and space applications.

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Qty. RoHS ECAD Model Number of Positions
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Amphenol Aerospace Circular MIL Spec Connector 56P RCPT SZ 25 SCKT WL MNT
Datasheet
6In Stock
Min.: 1
Mult.: 1
No
56 Position Socket (Female) 25-04 Receptacles 25 Wall Mount MIL-DTL-38999 III Crimp Wall Mount 7.5 A, 13 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 4P SZ 21 PLUG CBL MNT SKT
Datasheet
17In Stock
Min.: 1
Mult.: 1
4 Position Socket (Female) 21-75 Plugs 21 Straight MIL-DTL-38999 III Crimp Cable 46 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 55P SIZE 17 STRAIGHT PLUG PIN
Datasheet
17In Stock
18Expected 9/29/2026
Min.: 1
Mult.: 1
No
55 Position Pin (Male) 17-35 Plugs 17 Straight MIL-DTL-38999 III Crimp Cable 5 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 5P WL MNT SOC SZ 15
Datasheet
20In Stock
Min.: 1
Mult.: 1
No
5 Position Socket (Female) 15-05 Receptacles 15 Wall Mount MIL-DTL-38999 III Crimp Wall Mount 13 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 10P; SZ 13 JAM NUT PIN
Datasheet
33In Stock
Min.: 1
Mult.: 1
No
10 Position Pin (Male) 13-98 Receptacles 13 Jam Nut MIL-DTL-38999 III Crimp Panel 7.5 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 18P SIZE 15 SOCKET CABLE MOUNT PLUG
Datasheet
8In Stock
Min.: 1
Mult.: 1

18 Position Socket (Female) 15-18 Plugs 15 Straight MIL-DTL-38999 III Crimp Cable 7.5 A Gold Copper Alloy Stainless 38999 Bulk
Amphenol Aerospace Circular MIL Spec Connector 79P jam nut soc sz 21
Datasheet
10In Stock
Min.: 1
Mult.: 1

79 Position Without Socket Contacts 21-35 Receptacles 21 Jam Nut MIL-DTL-38999 III Crimp Panel 5 A Gold Copper Alloy 38999 Aluminum Each
Amphenol Aerospace Circular MIL Spec Connector 100P SZ 23WALL MOUNT SOCKET
Datasheet
12In Stock
Min.: 1
Mult.: 1

100 Position Without Socket Contacts 23-35 Receptacles 23 Wall Mount MIL-DTL-38999 III Crimp Wall Mount 5 A Gold Copper Alloy 38999 Aluminum Each
Amphenol Aerospace Circular MIL Spec Connector 26P SIZE 17 STRAIGHT PLUG PIN
Datasheet
7In Stock
Min.: 1
Mult.: 1
No
26 Position Pin (Male) 17-26 Plugs 17 Straight MIL-DTL-38999 III Crimp Cable 7.5 A Gold Copper Alloy Composite 38999
Amphenol Aerospace Circular MIL Spec Connector 53P PLG SZ 23 SKT CBL MNT
Datasheet
5In Stock
Min.: 1
Mult.: 1

53 Position Socket (Female) 23-53 Plugs 23 Straight MIL-DTL-38999 III Crimp Cable 7.5 A Gold Copper Alloy Stainless 38999
Amphenol Aerospace Circular MIL Spec Connector 22P SZ 13 PLUG CBL MNT PIN
Datasheet
2In Stock
Min.: 1
Mult.: 1
No
22 Position Pin (Male) 13-35 Plugs 13 Straight MIL-DTL-38999 III Crimp Cable 5 A Gold Copper Alloy Composite 38999
Amphenol Aerospace Circular MIL Spec Connector 19P ST PLUG PIN SZ 25
Datasheet
5In Stock
Min.: 1
Mult.: 1
No
19 Position Pin (Male) 25-19 Plugs 25 Straight MIL-DTL-38999 III Crimp Cable 23 A Gold Copper Alloy Composite 38999
Amphenol Aerospace Circular MIL Spec Connector 8P SZ 17 PANEL MOUNT SOCKET
Datasheet
7In Stock
Min.: 1
Mult.: 1
8 Position Socket (Female) 17-08 Receptacles 17 Jam Nut MIL-DTL-38999 III Crimp Panel 13 A Gold Copper Alloy Stainless 38999
Amphenol Aerospace Circular MIL Spec Connector 100P SIZE 23 STRAIGHT PLUG SKT
Datasheet
5In Stock
Min.: 1
Mult.: 1

100 Position Socket (Female) 23-35 Plugs 23 Straight MIL-DTL-38999 III Crimp Cable 5 A Gold Copper Alloy Composite 38999
Amphenol Aerospace Circular MIL Spec Connector 8P PLG SZ 25 SKT CBL MNT
Datasheet
3In Stock
Min.: 1
Mult.: 1
No
8 Position Without Socket Contacts 25-08 Plugs 25 Straight MIL-DTL-38999 III Crimp Cable 46 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 8P SIZE 25 STRAIGHT PLUG PIN
Datasheet
8Stock Available
More Info Available
Min.: 100
Mult.: 1
No
8 Position Pin (Male) 25-08 Plugs 25 Straight MIL-DTL-38999 III Crimp Cable 46 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 56P st plug sz 25
Datasheet
5In Stock
Min.: 1
Mult.: 1
No
56 Position Socket (Female) 25-04 Plugs 25 Straight MIL-DTL-38999 III Crimp Cable 7.5 A, 13 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 6P ST WL MNT SZ 11
Datasheet
26In Stock
Min.: 1
Mult.: 1

6 Position Socket (Female) 11-98 Receptacles 11 Wall Mount MIL-DTL-38999 III Crimp Wall Mount 7.5 A Gold Copper Alloy 38999 Aluminum Each
Amphenol Aerospace Circular MIL Spec Connector 3P SZ 9 PLUG CBL MNT PIN
Datasheet
98In Stock
Min.: 1
Mult.: 1

3 Position Pin (Male) 09-98 Plugs 9 Straight MIL-DTL-38999 III Crimp Cable 7.5 A Gold Copper Alloy 38999 Aluminum
Amphenol Aerospace Circular MIL Spec Connector 18P ST PLUG SOC SZ 15
Datasheet
5In Stock
Min.: 1
Mult.: 1
No
18 Position Socket (Female) 15-18 Plugs 15 Straight MIL-DTL-38999 III Crimp Cable 7.5 A Gold Copper Alloy Composite 38999 Each
Amphenol Aerospace Circular MIL Spec Connector 4P FM SZ 21 PIN WL MNT
Datasheet
5In Stock
Min.: 1
Mult.: 1

4 Position Without Pin Contacts 21-75 Receptacles 21 Wall Mount MIL-DTL-38999 III Crimp Wall Mount 46 A Gold Copper Alloy Composite 38999 Each
Amphenol Aerospace Circular MIL Spec Connector 61P ST PLUG SOC SZ 25
Datasheet
5In Stock
Min.: 1
Mult.: 1
No
61 Position Socket (Female) 25-61 Plugs 25 Straight MIL-DTL-38999 III Crimp Cable 7.5 A Gold Copper Alloy Composite 38999
Amphenol Aerospace Circular MIL Spec Connector 128P PLG SZ 25 SKT CBL MNT
Datasheet
18In Stock
Min.: 1
Mult.: 1
No
128 Position Socket (Female) 25-35 Plugs 25 Straight MIL-DTL-38999 III Crimp Cable 5 A Gold Copper Alloy Composite 38999
Amphenol Aerospace Circular MIL Spec Connector 61P PLG SZ 25 SKT CBL MNT
Datasheet
20In Stock
Min.: 1
Mult.: 1
No
61 Position Socket (Female) 25-61 Plugs 25 Straight MIL-DTL-38999 III Crimp Cable 7.5 A Gold Copper Alloy Composite 38999
Amphenol Aerospace Circular MIL Spec Connector 128P PLG SZ 25 PIN CBL MNT
Datasheet
18In Stock
Min.: 1
Mult.: 1

128 Position Pin (Male) 25-35 Plugs 25 Straight MIL-DTL-38999 III Crimp Cable 5 A Gold Copper Alloy Composite 38999