Circular MIL Spec Connector – Mouser Puerto Rico

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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 (USD) 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 TRI-START ALUMINUM D38999/26FJ35PA Amphenol Aerospace 1: $175.57 A tariff of 8% may be applied if shipping to the United States. 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	$175.57 $151.59 $147.41 $139.49 Quote Quote A tariff of 8% may be applied if shipping to the United States.	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 128P RCPT SZ 25 PIN WL MNT D38999/20FJ35PA Amphenol Aerospace 1: $203.24 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	$203.24 $124.38 $114.15 $109.58	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 55P RCPT SZ 17 PIN PNL MNT D38999/24FE35PN Amphenol Aerospace 1: $104.41 A tariff of 8% may be applied if shipping to the United States. 353In Stock	Mfr. Part # D38999/24FE35PN Mouser Part # 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	$104.41 $95.03 $91.10 A tariff of 8% may be applied if shipping to the United States.	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 79P SIZE 21 STRAIGHT PLUG SKT D38999/26WG35SA Amphenol Aerospace 1: $207.84 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	$207.84 $157.42 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: $955.17 A tariff of 8% may be applied if shipping to the United States. 38In Stock 80Expected 10/16/2026	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	38In Stock 80Expected 10/16/2026	$955.17 $612.21 Quote Quote A tariff of 8% may be applied if shipping to the United States.	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 TRI-START ALUMINUM D38999/20WH35SA Amphenol Aerospace 1: $201.86 98In Stock	Mfr. Part # D38999/20WH35SA Mouser Part # 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	$201.86 $174.29 $168.29	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: $96.27 202In Stock	Mfr. Part # D38999/24FC35SA Mouser Part # 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	$96.27	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 5P RCPT SZ 15 SKT PNL MNT D38999/24FD5SN Amphenol Aerospace 1: $103.30 96In Stock	Mfr. Part # D38999/24FD5SN Mouser Part # 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	$103.30	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: $141.63 36In Stock	Mfr. Part # D38999/20FH53SN Mouser Part # 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	$141.63	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 66P RCPT SZ 19 PIN PNL MNT D38999/24FF35PN Amphenol Aerospace 1: $92.75 A tariff of 8% may be applied if shipping to the United States. 55In Stock	Mfr. Part # D38999/24FF35PN Mouser Part # 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	$92.75 $91.92 A tariff of 8% may be applied if shipping to the United States.	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 RCPT SZ 15 PIN WL MNT D38999/20FD35PA Amphenol Aerospace 1: $67.40 A tariff of 8% may be applied if shipping to the United States. 102In 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	102In Stock	$67.40 $63.97 A tariff of 8% may be applied if shipping to the United States.	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 37P SIZE 15 JAM NUT RECEPTACLE PIN D38999/24FD35PB Amphenol Aerospace 1: $97.68 23In Stock	Mfr. Part # D38999/24FD35PB Mouser Part # 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	$97.68 $90.41 $77.64	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 3P SZ 9 PLUG CBL MNT PIN D38999/26FA98PB Amphenol Aerospace 1: $198.25 A tariff of 8% may be applied if shipping to the United States. 92In Stock	Mfr. Part # D38999/26FA98PB Mouser Part # 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	$198.25 $91.45 $88.03 A tariff of 8% may be applied if shipping to the United States.	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: $112.65 A tariff of 8% may be applied if shipping to the United States. 110In 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	110In Stock	$112.65 $98.11 $89.88 $85.19 View $78.22 Quote A tariff of 8% may be applied if shipping to the United States.	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: $242.10 A tariff of 8% may be applied if shipping to the United States. 95In 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	95In Stock	$242.10 $157.11 $151.07 $146.02 Quote Quote A tariff of 8% may be applied if shipping to the United States.	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 5P SIZE 15 WALL MOUNT RECEPTACLE SKT D38999/20FD5SN Amphenol Aerospace 1: $123.08 A tariff of 8% may be applied if shipping to the United States. 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	$123.08 $83.76 $72.35 $58.62 A tariff of 8% may be applied if shipping to the United States.	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: $159.91 96In 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	96In Stock	$159.91 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: $173.65 A tariff of 8% may be applied if shipping to the United States. 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	$173.65 A tariff of 8% may be applied if shipping to the United States.	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 128P FM SZ 25 SCKT WL MNT D38999/20JJ35SA Amphenol Aerospace 1: $239.92 A tariff of 8% may be applied if shipping to the United States. 61In Stock	Mfr. Part # D38999/20JJ35SA Mouser Part # 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	$239.92 $232.73 A tariff of 8% may be applied if shipping to the United States.	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 128P FM SZ 25 SKT WL MNT D38999/20JJ35SN Amphenol Aerospace 1: $267.32 A tariff of 8% may be applied if shipping to the United States. 58In Stock	Mfr. Part # D38999/20JJ35SN Mouser Part # 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	$267.32 $243.79 $235.10 A tariff of 8% may be applied if shipping to the United States.	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 22P WALL MOUNT RECEP PIN CRIMP SZ 13 D38999/20WC35PC Amphenol Aerospace 1: $72.50 A tariff of 8% may be applied if shipping to the United States. 116In 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	116In Stock	$72.50 $57.05 $53.53 $51.60 View $48.96 Quote A tariff of 8% may be applied if shipping to the United States.	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: $354.57 A tariff of 8% may be applied if shipping to the United States. 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	$354.57 $275.83 $197.02 $119.79 View $119.76 Quote A tariff of 8% may be applied if shipping to the United States.	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 79P SIZE 21 STRAIGHT PLUG SKT D38999/26FG35SB Amphenol Aerospace 1: $521.04 30In Stock	Mfr. Part # D38999/26FG35SB Mouser Part # 654-D38999/26FG35SB	Amphenol Aerospace	Circular MIL Spec Connector 79P SIZE 21 STRAIGHT PLUG SKT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	30In Stock	$521.04 $464.49 View Quote	Min.: 1 Mult.: 1		79 Position	Socket (Female)	21-35	Plugs	21	Straight	MIL-DTL-38999 III	Crimp	Cable	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 53P PLG SZ 23 PIN CBL MNT D38999/26FH53PN Amphenol Aerospace 1: $216.51 A tariff of 8% may be applied if shipping to the United States. 87In Stock	Mfr. Part # D38999/26FH53PN Mouser Part # 654-D38999/26FH53PN	Amphenol Aerospace	Circular MIL Spec Connector 53P PLG SZ 23 PIN CBL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	87In Stock	$216.51 $175.91 $148.14 $127.93 $106.13 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1		53 Position	Pin (Male)	23-53	Plugs	23	Straight	MIL-DTL-38999 III	Crimp	Cable	7.5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 11P RCPT PIN D38999/26WG11PA Amphenol Aerospace 1: $260.17 A tariff of 8% may be applied if shipping to the United States. 96In Stock	Mfr. Part # D38999/26WG11PA Mouser Part # 654-D38999/26WG11PA	Amphenol Aerospace	Circular MIL Spec Connector 11P RCPT PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	96In Stock	$260.17 $211.39 $178.02 $153.74 $89.38 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	No	11 Position	Pin (Male)	21-11	Plugs	21	Straight	MIL-DTL-38999 III	Crimp	Cable	23 A	Gold	Copper Alloy	38999 Aluminum