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 (CAD) 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: $273.57 117In Stock	Mfr. Part # D38999/20FJ35PA Mouser Part # 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	$273.57 $188.45 $176.26 $165.76 $160.34	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: $252.82 98In Stock	Mfr. Part # D38999/26FJ35PA Mouser Part # 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	$252.82 $218.30 $212.62 $208.89	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: $346.25 101In Stock	Mfr. Part # D38999/26WG35SA Mouser Part # 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	$346.25 $241.65 $232.98 $226.70	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: $1,044.30 36In Stock 80Expected 2026-10-16	Mfr. Part # D38999/26WG75PN Mouser Part # 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	36In Stock 80Expected 2026-10-16	$1,044.30 $805.56 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 37P RCPT SZ 15 PIN WL MNT D38999/20FD35PA Amphenol Aerospace 1: $97.78 101In Stock	Mfr. Part # D38999/20FD35PA Mouser Part # 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	101In Stock	$97.78 $93.25	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 10P; SZ 13 ST PLUG STRT PLUG D38999/26FC98PA Amphenol Aerospace 1: $179.22 97In Stock	Mfr. Part # D38999/26FC98PA Mouser Part # 654-D38999/26FC98PA	Amphenol Aerospace	Circular MIL Spec Connector 10P; SZ 13 ST PLUG STRT PLUG Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	97In Stock	$179.22 $114.93	Min.: 1 Mult.: 1		10 Position	Pin (Male)	13-98	Plugs	13	Straight	MIL-DTL-38999 III	Crimp	Cable	7.5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 19P RCPT SZ 25 PIN WL MNT D38999/20FJ19PN Amphenol Aerospace 1: $152.21 110In Stock	Mfr. Part # D38999/20FJ19PN Mouser Part # 654-D38999/20FJ19PN	Amphenol Aerospace	Circular MIL Spec Connector 19P RCPT SZ 25 PIN WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	110In Stock	$152.21 $146.61	Min.: 1 Mult.: 1		19 Position	Pin (Male)	25-19	Receptacles	25	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	23 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 5P SIZE 15 WALL MOUNT RECEPTACLE SKT D38999/20FD5SN Amphenol Aerospace 1: $163.87 102In Stock	Mfr. Part # D38999/20FD5SN Mouser Part # 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	$163.87 $103.15 $82.57	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: $178.53 93In Stock	Mfr. Part # D38999/20FH21SN Mouser Part # 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	93In Stock	$178.53	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 MS/TRI-START ALUMINUM D38999/26FD18SN Amphenol Aerospace 1: $143.48 107In Stock	Mfr. Part # D38999/26FD18SN Mouser Part # 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	107In Stock	$143.48 $129.25 $121.58 $117.89 View $112.64 Quote	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: $386.06 88In Stock	Mfr. Part # D38999/26FH55SN Mouser Part # 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	88In Stock	$386.06 $226.24 $219.87	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 PLG SZ 19 SKT CBL MNT D38999/26JF35SN Amphenol Aerospace 1: $260.04 73In Stock	Mfr. Part # D38999/26JF35SN Mouser Part # 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	$260.04 $250.06	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 22P RCPT SZ 13 PIN WL MNT D38999/20WC35PB Amphenol Aerospace 1: $103.41 126In Stock	Mfr. Part # D38999/20WC35PB Mouser Part # 654-D38999/20WC35PB	Amphenol Aerospace	Circular MIL Spec Connector 22P RCPT SZ 13 PIN WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	126In Stock	$103.41 $89.65 $86.16 $82.35 $82.34	Min.: 1 Mult.: 1	No	22 Position	Pin (Male)	13-35	Receptacles	13	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 32P RCPT SZ 19 SKT PNL MNT D38999/24FF32SN Amphenol Aerospace 1: $182.79 109In Stock	Mfr. Part # D38999/24FF32SN Mouser Part # 654-D38999/24FF32SN	Amphenol Aerospace	Circular MIL Spec Connector 32P RCPT SZ 19 SKT PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	109In Stock	$182.79 $130.55	Min.: 1 Mult.: 1		32 Position	Socket (Female)	19-32	Receptacles	19	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	7.5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 19P PLG SZ 15 PIN CBL MNT D38999/26WD19PA Amphenol Aerospace 1: $224.68 98In Stock	Mfr. Part # D38999/26WD19PA Mouser Part # 654-D38999/26WD19PA	Amphenol Aerospace	Circular MIL Spec Connector 19P PLG SZ 15 PIN CBL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	98In Stock	$224.68 $144.99 $129.21	Min.: 1 Mult.: 1	No	19 Position	Pin (Male)	15-19	Plugs	15	Straight	MIL-DTL-38999 III	Crimp	Cable	7.5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 6P FM SZ 9 SKT PNL MNT D38999/24WA35SA Amphenol Aerospace 1: $131.49 99In Stock 2On Order	Mfr. Part # D38999/24WA35SA Mouser Part # 654-D38999/24WA35SA	Amphenol Aerospace	Circular MIL Spec Connector 6P FM SZ 9 SKT PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	99In Stock 2On Order	$131.49 $91.24	Min.: 1 Mult.: 1		6 Position	Socket (Female)	09-35	Receptacles	9	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	5 A	Gold	Copper Alloy	38999 Aluminum	Bulk
Circular MIL Spec Connector KJA SERIES III D38999/24WJ61PN Amphenol Aerospace 1: $202.88 91In Stock	Mfr. Part # D38999/24WJ61PN Mouser Part # 654-D38999/24WJ61PN	Amphenol Aerospace	Circular MIL Spec Connector KJA SERIES III Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	91In Stock	$202.88 $163.21	Min.: 1 Mult.: 1		61 Position	Pin (Male)	25-61	Receptacles	25	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	7.5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 61P SIZE 25 STRAIGHT PLUG PIN D38999/26WJ61PA Amphenol Aerospace 1: $202.51 85In Stock	Mfr. Part # D38999/26WJ61PA Mouser Part # 654-D38999/26WJ61PA	Amphenol Aerospace	Circular MIL Spec Connector 61P SIZE 25 STRAIGHT PLUG PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	85In Stock	$202.51 $185.85 $178.70 $172.74 $163.17	Min.: 1 Mult.: 1	No	61 Position	Pin (Male)	25-61	Plugs	25	Straight	MIL-DTL-38999 III	Crimp	Cable	7.5 A	Gold	Copper Alloy	38999 Aluminum	Bulk
Circular MIL Spec Connector 22P WALL MOUNT RECEP PIN CRIMP SZ 13 D38999/20WC35PC Amphenol Aerospace 1: $97.26 115In Stock	Mfr. Part # D38999/20WC35PC Mouser Part # 654-D38999/20WC35PC	Amphenol Aerospace	Circular MIL Spec Connector 22P WALL MOUNT RECEP PIN CRIMP SZ 13 Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	115In Stock	$97.26 $81.59 $76.65 $73.54 $71.99	Min.: 1 Mult.: 1	No	22 Position	Pin (Male)	13-35	Receptacles	13	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 61P RCPT SZ 25 PIN PNL MNT D38999/24FJ61PN Amphenol Aerospace 1: $204.98 90In Stock	Mfr. Part # D38999/24FJ61PN Mouser Part # 654-D38999/24FJ61PN	Amphenol Aerospace	Circular MIL Spec Connector 61P RCPT SZ 25 PIN PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	90In Stock	$204.98 $188.06 $180.78	Min.: 1 Mult.: 1		61 Position	Pin (Male)	25-61	Receptacles	25	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	7.5 A	Gold	Copper Alloy	38999 Aluminum	Bulk
Circular MIL Spec Connector 11P RCPT SZ 19 SKT WL MNT D38999/20WF11SN Amphenol Aerospace 1: $140.89 86In Stock	Mfr. Part # D38999/20WF11SN Mouser Part # 654-D38999/20WF11SN	Amphenol Aerospace	Circular MIL Spec Connector 11P RCPT SZ 19 SKT WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	86In Stock	$140.89 $122.73 $113.92 $107.06	Min.: 1 Mult.: 1	No	11 Position	Socket (Female)	19-11	Receptacles	19	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	13 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 23P SZ 17 PLUG CBL MNT PIN D38999/26FE99PN Amphenol Aerospace 1: $177.13 86In Stock	Mfr. Part # D38999/26FE99PN Mouser Part # 654-D38999/26FE99PN	Amphenol Aerospace	Circular MIL Spec Connector 23P SZ 17 PLUG CBL MNT PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	86In Stock	$177.13 $158.90 $147.74 $137.82 View $132.06 Quote	Min.: 1 Mult.: 1		23 Position	Pin (Male)	17-99	Plugs	17	Straight	MIL-DTL-38999 III	Crimp	Cable	7.5 A, 13 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 4P ST PLUG SZ 13 D38999/26WC4SA Amphenol Aerospace 1: $126.91 95In Stock	Mfr. Part # D38999/26WC4SA Mouser Part # 654-D38999/26WC4SA	Amphenol Aerospace	Circular MIL Spec Connector 4P ST PLUG SZ 13 Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	95In Stock	$126.91 $122.83 $114.49	Min.: 1 Mult.: 1		4 Position	Socket (Female)	13-04	Plugs	13	Straight	MIL-DTL-38999 III	Crimp	Cable	13 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 8P PLG SZ 13 PIN CBL MNT D38999/26WC8PA Amphenol Aerospace 1: $185.49 100In Stock	Mfr. Part # D38999/26WC8PA Mouser Part # 654-D38999/26WC8PA	Amphenol Aerospace	Circular MIL Spec Connector 8P PLG SZ 13 PIN CBL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	100In Stock	$185.49 $122.41 $117.71 $113.77 View $107.54 Quote	Min.: 1 Mult.: 1	No	8 Position	Pin (Male)	13-08	Plugs	13	Straight	MIL-DTL-38999 III	Crimp	Cable	7.5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 128P SIZE 25 STRAIGHT PLUG SKT D38999/26WJ35SA Amphenol Aerospace 1: $164.12 29In Stock	Mfr. Part # D38999/26WJ35SA Mouser Part # 654-D38999/26WJ35SA	Amphenol Aerospace	Circular MIL Spec Connector 128P SIZE 25 STRAIGHT PLUG SKT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	29In Stock	$164.12	Min.: 1 Mult.: 1		128 Position	Socket (Female)	25-35	Plugs	25	Straight	MIL-DTL-38999 III	Crimp	Cable	5 A	Gold	Copper Alloy	38999 Aluminum