Circular MIL Spec Connector

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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 1000V_RMS. These rugged and highly reliable circular connectors are ideally suited for industrial, commercial air, military, C4ISR, and space applications.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (EUR) Filter the results in the table by unit price based on your quantity.	Qty.	RoHS	Number of Positions	Contact Gender	Insert Arrangement	Product	Shell Size	Shell Style	MIL Type	Termination Style	Mounting Style	Current Rating	Contact Plating	Contact Material	Series	Packaging
Circular MIL Spec Connector 128P RCPT SZ 25 PIN WL MNT D38999/20FJ35PA Amphenol Aerospace 1: €174.79 117In Stock	Mfr. Part No. D38999/20FJ35PA Mouser Part No 654-D38999/20FJ35PA	Amphenol Aerospace	Circular MIL Spec Connector 128P RCPT SZ 25 PIN WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	117In Stock	€174.79 €106.97 €102.09	Min.: 1 Mult.: 1		128 Position	Pin (Male)	25-35	Receptacles	25	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector TRI-START ALUMINUM D38999/26FJ35PA Amphenol Aerospace 1: €150.99 98In Stock	Mfr. Part No. D38999/26FJ35PA Mouser Part No 654-D38999/26FJ35PA	Amphenol Aerospace	Circular MIL Spec Connector TRI-START ALUMINUM Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	98In Stock	€150.99 €130.37 €126.77 €120.73	Min.: 1 Mult.: 1		128 Position	Pin (Male)	25-35	Plugs	25	Straight	MIL-DTL-38999 III	Crimp	Cable	5 A	Gold	Copper Alloy	38999 Aluminum	Bulk
Circular MIL Spec Connector 79P SIZE 21 STRAIGHT PLUG SKT D38999/26WG35SA Amphenol Aerospace 1: €178.74 101In Stock	Mfr. Part No. D38999/26WG35SA Mouser Part No 654-D38999/26WG35SA	Amphenol Aerospace	Circular MIL Spec Connector 79P SIZE 21 STRAIGHT PLUG SKT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	101In Stock	€178.74 €135.38 Quote Quote	Min.: 1 Mult.: 1	No	79 Position	Socket (Female)	21-35	Plugs	21	Straight	MIL-DTL-38999 III	Crimp	Cable	5 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 4P PLG SZ 21 PIN CBL MNT D38999/26WG75PN Amphenol Aerospace 1: €821.45 38In Stock 80Expected 16/10/2026	Mfr. Part No. D38999/26WG75PN Mouser Part No 654-D38999/26WG75PN	Amphenol Aerospace	Circular MIL Spec Connector 4P PLG SZ 21 PIN CBL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	38In Stock 80Expected 16/10/2026	€821.45 €526.50 Quote Quote	Min.: 1 Mult.: 1	No	4 Position	Pin (Male)	21-75	Plugs	21	Straight	MIL-DTL-38999 III	Crimp	Cable	46 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 55P RCPT SZ 17 PIN PNL MNT D38999/24FE35PN Amphenol Aerospace 1: €89.79 353In Stock	Mfr. Part No. D38999/24FE35PN Mouser Part No 654-D38999/24FE35PN	Amphenol Aerospace	Circular MIL Spec Connector 55P RCPT SZ 17 PIN PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	353In Stock	€89.79 €81.73 €78.35	Min.: 1 Mult.: 1		55 Position	Pin (Male)	17-35	Receptacles	17	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector TRI-START ALUMINUM D38999/20WH35SA Amphenol Aerospace 1: €173.60 98In Stock	Mfr. Part No. D38999/20WH35SA Mouser Part No 654-D38999/20WH35SA	Amphenol Aerospace	Circular MIL Spec Connector TRI-START ALUMINUM Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	98In Stock	€173.60 €149.89 €144.73	Min.: 1 Mult.: 1	No	100 Position	Socket (Female)	23-35	Receptacles	23	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 22P RCPT SZ 13 SKT PNL MNT D38999/24FC35SA Amphenol Aerospace 1: €82.79 202In Stock	Mfr. Part No. D38999/24FC35SA Mouser Part No 654-D38999/24FC35SA	Amphenol Aerospace	Circular MIL Spec Connector 22P RCPT SZ 13 SKT PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	202In Stock	€82.79	Min.: 1 Mult.: 1		22 Position	Socket (Female)	13-35	Receptacles	13	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	5 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 3P SZ 9 PLUG CBL MNT PIN D38999/26FA98PB Amphenol Aerospace 1: €170.50 92In Stock	Mfr. Part No. D38999/26FA98PB Mouser Part No 654-D38999/26FA98PB	Amphenol Aerospace	Circular MIL Spec Connector 3P SZ 9 PLUG CBL MNT PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	92In Stock	€170.50 €78.65 €75.71	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
Circular MIL Spec Connector MS/TRI-START ALUMINUM D38999/26FD18SN Amphenol Aerospace 1: €96.88 110In Stock	Mfr. Part No. D38999/26FD18SN Mouser Part No 654-D38999/26FD18SN	Amphenol Aerospace	Circular MIL Spec Connector MS/TRI-START ALUMINUM Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	110In Stock	€96.88 €84.37 €77.30 €73.26 €69.81	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	38999 Aluminum
Circular MIL Spec Connector 55P SIZE 23 STRAIGHT PLUG SKT D38999/26FH55SN Amphenol Aerospace 1: €208.21 95In Stock	Mfr. Part No. D38999/26FH55SN Mouser Part No 654-D38999/26FH55SN	Amphenol Aerospace	Circular MIL Spec Connector 55P SIZE 23 STRAIGHT PLUG SKT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	95In Stock	€208.21 €135.11 €129.92 €125.58 €112.10	Min.: 1 Mult.: 1		55 Position	Socket (Female)	23-55	Plugs	23	Straight	MIL-DTL-38999 III	Crimp	Cable	7.5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 66P RCPT SZ 19 PIN PNL MNT D38999/24FF35PN Amphenol Aerospace 1: €85.63 55In Stock	Mfr. Part No. D38999/24FF35PN Mouser Part No 654-D38999/24FF35PN	Amphenol Aerospace	Circular MIL Spec Connector 66P RCPT SZ 19 PIN PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	55In Stock	€85.63	Min.: 1 Mult.: 1		66 Position	Pin (Male)	19-35	Receptacles	19	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 37P SIZE 15 JAM NUT RECEPTACLE PIN D38999/24FD35PB Amphenol Aerospace 1: €84.00 23In Stock	Mfr. Part No. D38999/24FD35PB Mouser Part No 654-D38999/24FD35PB	Amphenol Aerospace	Circular MIL Spec Connector 37P SIZE 15 JAM NUT RECEPTACLE PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	23In Stock	€84.00 €77.75 €72.32	Min.: 1 Mult.: 1		37 Position	Pin (Male)	15-35	Receptacles	15	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 128P FM SZ 25 SCKT WL MNT D38999/20JJ35SA Amphenol Aerospace 1: €216.81 61In Stock	Mfr. Part No. D38999/20JJ35SA Mouser Part No 654-D38999/20JJ35SA	Amphenol Aerospace	Circular MIL Spec Connector 128P FM SZ 25 SCKT WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	61In Stock	€216.81	Min.: 1 Mult.: 1	No	128 Position	Socket (Female)	25-35	Receptacles	25	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	5 A	Gold	Copper Alloy	Composite 38999
Circular MIL Spec Connector 37P RCPT SZ 15 PIN WL MNT D38999/20FD35PA Amphenol Aerospace 1: €59.59 102In Stock	Mfr. Part No. D38999/20FD35PA Mouser Part No 654-D38999/20FD35PA	Amphenol Aerospace	Circular MIL Spec Connector 37P RCPT SZ 15 PIN WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	102In Stock	€59.59	Min.: 1 Mult.: 1		37 Position	Pin (Male)	15-35	Receptacles	15	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 5P RCPT SZ 15 SKT PNL MNT D38999/24FD5SN Amphenol Aerospace 1: €88.84 96In Stock	Mfr. Part No. D38999/24FD5SN Mouser Part No 654-D38999/24FD5SN	Amphenol Aerospace	Circular MIL Spec Connector 5P RCPT SZ 15 SKT PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	96In Stock	€88.84	Min.: 1 Mult.: 1		5 Position	Socket (Female)	15-05	Receptacles	15	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	13 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 53P RCPT SZ 23 SKT WL MNT D38999/20FH53SN Amphenol Aerospace 1: €121.80 36In Stock	Mfr. Part No. D38999/20FH53SN Mouser Part No 654-D38999/20FH53SN	Amphenol Aerospace	Circular MIL Spec Connector 53P RCPT SZ 23 SKT WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	36In Stock	€121.80	Min.: 1 Mult.: 1		53 Position	Socket (Female)	23-53	Receptacles	23	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	7.5 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 128P FM SZ 25 SKT WL MNT D38999/20JJ35SN Amphenol Aerospace 1: €229.90 58In Stock	Mfr. Part No. D38999/20JJ35SN Mouser Part No 654-D38999/20JJ35SN	Amphenol Aerospace	Circular MIL Spec Connector 128P FM SZ 25 SKT WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	58In Stock	€229.90 €216.81	Min.: 1 Mult.: 1	No	128 Position	Socket (Female)	25-35	Receptacles	25	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	5 A	Gold	Copper Alloy	Composite 38999
Circular MIL Spec Connector 5P SIZE 15 WALL MOUNT RECEPTACLE SKT D38999/20FD5SN Amphenol Aerospace 1: €105.85 102In Stock	Mfr. Part No. D38999/20FD5SN Mouser Part No 654-D38999/20FD5SN	Amphenol Aerospace	Circular MIL Spec Connector 5P SIZE 15 WALL MOUNT RECEPTACLE SKT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	102In Stock	€105.85 €72.03 €62.22 €53.42	Min.: 1 Mult.: 1		5 Position	Socket (Female)	15-05	Receptacles	15	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	13 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 21P RCPT SZ 23 SKT WL MNT D38999/20FH21SN Amphenol Aerospace 1: €137.52 96In Stock	Mfr. Part No. D38999/20FH21SN Mouser Part No 654-D38999/20FH21SN	Amphenol Aerospace	Circular MIL Spec Connector 21P RCPT SZ 23 SKT WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	96In Stock	€137.52 €116.38 View Quote	Min.: 1 Mult.: 1		21 Position	Socket (Female)	23-21	Receptacles	23	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	13 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 66P PLG SZ 19 SKT CBL MNT D38999/26JF35SN Amphenol Aerospace 1: €161.77 73In Stock	Mfr. Part No. D38999/26JF35SN Mouser Part No 654-D38999/26JF35SN	Amphenol Aerospace	Circular MIL Spec Connector 66P PLG SZ 19 SKT CBL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	73In Stock	€161.77	Min.: 1 Mult.: 1	No	66 Position	Socket (Female)	19-35	Plugs	19	Straight	MIL-DTL-38999 III	Crimp	Cable	5 A	Gold	Copper Alloy	Composite 38999
Circular MIL Spec Connector 100P SIZE 23 WALL MOUNT RECEPTACLE PIN D38999/20FH35AB Amphenol Aerospace 1: €75.53 44In Stock	Mfr. Part No. D38999/20FH35AB Mouser Part No 654-D38999/20FH35AB	Amphenol Aerospace	Circular MIL Spec Connector 100P SIZE 23 WALL MOUNT RECEPTACLE PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	44In Stock	€75.53	Min.: 1 Mult.: 1		100 Position	Without Pin Contacts	23-35	Receptacles	23	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 37P SIZE 15 JAM NUT RECEPTACLE SKT D38999/24FD35SA Amphenol Aerospace 1: €121.79 109In Stock	Mfr. Part No. D38999/24FD35SA Mouser Part No 654-D38999/24FD35SA	Amphenol Aerospace	Circular MIL Spec Connector 37P SIZE 15 JAM NUT RECEPTACLE SKT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	109In Stock	€121.79 €108.00 €91.23	Min.: 1 Mult.: 1		37 Position	Socket (Female)	15-35	Receptacles	15	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 39P FM SZ 21 PIN PNL MNT D38999/24WG39PN Amphenol Aerospace 1: €240.96 7In Stock	Mfr. Part No. D38999/24WG39PN Mouser Part No 654-D38999/24WG39PN	Amphenol Aerospace	Circular MIL Spec Connector 39P FM SZ 21 PIN PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	7In Stock	€240.96 €188.87	Min.: 1 Mult.: 1	No	39 Position	Pin (Male)	21-39	Receptacles	21	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	7.5 A, 13 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 41P st plug soc SZ 21 D38999/26WG41SA Amphenol Aerospace 1: €120.09 16In Stock	Mfr. Part No. D38999/26WG41SA Mouser Part No 654-D38999/26WG41SA	Amphenol Aerospace	Circular MIL Spec Connector 41P st plug soc SZ 21 Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	16In Stock	€120.09 €91.33	Min.: 1 Mult.: 1	No	41 Position	Socket (Female)	21-41	Plugs	21	Straight	MIL-DTL-38999 III	Crimp	Cable	7.5 A	Gold	Copper Alloy	38999 Aluminum	Bulk
Circular MIL Spec Connector 53P SIZE 23 STRAIGHT PLUG SKT D38999/26WH53SN Amphenol Aerospace 1: €150.38 81In Stock 17Expected 05/10/2026	Mfr. Part No. D38999/26WH53SN Mouser Part No 654-D38999/26WH53SN	Amphenol Aerospace	Circular MIL Spec Connector 53P SIZE 23 STRAIGHT PLUG SKT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	81In Stock 17Expected 05/10/2026	€150.38 €138.25 €132.90 €106.17	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	38999 Aluminum