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 $146.15 $145.06 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: $207.84 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	$207.84 $174.26 $110.34 $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: $95.67 A tariff of 8% may be applied if shipping to the United States. 342In 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	342In Stock	$95.67 $88.06 $83.79 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 8P FM SZ 13 PIN PNL MNT D38999/24WC8PN Amphenol Aerospace 1: $73.20 358In Stock	Mfr. Part # D38999/24WC8PN Mouser Part # 654-D38999/24WC8PN	Amphenol Aerospace	Circular MIL Spec Connector 8P FM SZ 13 PIN PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	358In Stock	$73.20 $64.66 $59.52 $56.12 Quote Quote	Min.: 1 Mult.: 1	No	8 Position	Pin (Male)	13-08	Receptacles	13	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	7.5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector TRI-START ALUMINUM D38999/20WH35SA Amphenol Aerospace 1: $201.86 96In 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	96In Stock	$201.86 $174.29 $169.35	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 79P SIZE 21 STRAIGHT PLUG SKT D38999/26WG35SA Amphenol Aerospace 1: $346.92 99In 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	99In Stock	$346.92 $320.50 $303.56 $183.09	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: $753.00 A tariff of 8% may be applied if shipping to the United States. 35In Stock 80On Order	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	35In Stock 80On Order	$753.00 $523.60 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 79P RCPT SZ 21 PIN PNL MNT D38999/24FG35PN Amphenol Aerospace 1: $129.65 122In Stock	Mfr. Part # D38999/24FG35PN Mouser Part # 654-D38999/24FG35PN	Amphenol Aerospace	Circular MIL Spec Connector 79P RCPT SZ 21 PIN PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	122In Stock	$129.65 $116.11 $111.32	Min.: 1 Mult.: 1		79 Position	Pin (Male)	21-35	Receptacles	21	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 11P SZ 21 WALL MOUNT SOCKET D38999/20FG11SA Amphenol Aerospace 1: $101.66 89In Stock	Mfr. Part # D38999/20FG11SA Mouser Part # 654-D38999/20FG11SA	Amphenol Aerospace	Circular MIL Spec Connector 11P SZ 21 WALL MOUNT SOCKET Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	89In Stock	$101.66	Min.: 1 Mult.: 1		11 Position	Socket (Female)	21-11	Receptacles	21	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	23 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 19P RCPT SZ 25 PIN WL MNT D38999/20FJ19PN Amphenol Aerospace 1: $100.15 A tariff of 8% may be applied if shipping to the United States. 108In 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	108In Stock	$100.15 $92.98 A tariff of 8% may be applied if shipping to the United States.	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 53P RCPT SZ 23 SKT WL MNT D38999/20FH53SN Amphenol Aerospace 1: $183.08 30In 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	30In Stock	$183.08 $151.08 $99.41	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 TRI-START ALUMINUM D38999/26FB35SB Amphenol Aerospace 1: $123.73 A tariff of 8% may be applied if shipping to the United States. 96In Stock 3Expected 11/9/2026	Mfr. Part # D38999/26FB35SB Mouser Part # 654-D38999/26FB35SB	Amphenol Aerospace	Circular MIL Spec Connector TRI-START ALUMINUM Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	96In Stock 3Expected 11/9/2026	$123.73 $115.49 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1		13 Position	Socket (Female)	11-35	Plugs	11	Straight	MIL-DTL-38999 III	Crimp	Cable	5 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 55P SIZE 23 WALL MOUNT RECEPTACLE PIN D38999/20FH55PN Amphenol Aerospace 1: $169.41 16In Stock	Mfr. Part # D38999/20FH55PN Mouser Part # 654-D38999/20FH55PN	Amphenol Aerospace	Circular MIL Spec Connector 55P SIZE 23 WALL MOUNT RECEPTACLE PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	16In Stock	$169.41 $161.75 $161.71	Min.: 1 Mult.: 1		55 Position	Pin (Male)	23-55	Receptacles	23	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	7.5 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 3P SZ 9 PLUG CBL MNT PIN D38999/26FA98PB Amphenol Aerospace 1: $101.03 A tariff of 8% may be applied if shipping to the United States. 91In 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	91In Stock	$101.03 $91.72 $88.51 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 55P SIZE 23 STRAIGHT PLUG SKT D38999/26FH55SN Amphenol Aerospace 1: $330.83 A tariff of 8% may be applied if shipping to the United States. 78In 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	78In Stock	$330.83 $158.63 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 37P SIZE 15 JAM NUT RECEPTACLE PIN D38999/24FD35PB Amphenol Aerospace 1: $87.12 21In 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	21In Stock	$87.12 $78.04 $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 128P FM SZ 25 SCKT WL MNT D38999/20JJ35SA Amphenol Aerospace 1: $267.29 A tariff of 8% may be applied if shipping to the United States. 58In 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	58In Stock	$267.29 $253.67 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 66P PLG SZ 19 SKT CBL MNT D38999/26JF35SN Amphenol Aerospace 1: $189.28 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	$189.28 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 5P RCPT SZ 15 SKT PNL MNT D38999/24FD5SN Amphenol Aerospace 1: $153.63 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	$153.63 $72.17 $70.71 Quote Quote	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 100P SIZE 23 STRAIGHT PLUG PIN D38999/26JH35PA Amphenol Aerospace 1: $278.15 A tariff of 8% may be applied if shipping to the United States. 60In Stock	Mfr. Part # D38999/26JH35PA Mouser Part # 654-D38999/26JH35PA	Amphenol Aerospace	Circular MIL Spec Connector 100P SIZE 23 STRAIGHT PLUG PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	60In Stock	$278.15 $243.87 $215.44 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	No	100 Position	Pin (Male)	23-35	Plugs	23	Straight	MIL-DTL-38999 III	Crimp	Cable	5 A	Gold	Copper Alloy	Composite 38999
Circular MIL Spec Connector 12P SZ 15 PANEL MOUNT PIN D38999/24WD97PA Amphenol Aerospace 1: $136.75 17In Stock	Mfr. Part # D38999/24WD97PA Mouser Part # 654-D38999/24WD97PA	Amphenol Aerospace	Circular MIL Spec Connector 12P SZ 15 PANEL MOUNT PIN Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	17In Stock	$136.75 $96.00	Min.: 1 Mult.: 1	No	12 Position	Pin (Male)	15-97	Receptacles	15	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	7.5 A, 13 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 11P FM SZ 21 PIN PNL MNT D38999/24WG11PA Amphenol Aerospace 1: $122.47 A tariff of 8% may be applied if shipping to the United States. 88In Stock	Mfr. Part # D38999/24WG11PA Mouser Part # 654-D38999/24WG11PA	Amphenol Aerospace	Circular MIL Spec Connector 11P FM SZ 21 PIN PNL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	88In Stock	$122.47 $111.14 $108.58 $108.35 View Quote A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	No	11 Position	Pin (Male)	21-11	Receptacles	21	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	23 A	Gold	Copper Alloy	38999 Aluminum
Circular MIL Spec Connector 4P JAM NUT RECPT SZ 21 D38999/24WG75AN Amphenol Aerospace 1: $305.00 37In Stock	Mfr. Part # D38999/24WG75AN Mouser Part # 654-D38999/24WG75AN	Amphenol Aerospace	Circular MIL Spec Connector 4P JAM NUT RECPT SZ 21 Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	37In Stock	$305.00 $221.44	Min.: 1 Mult.: 1	No	4 Position	Without Pin Contacts	21-75	Receptacles	21	Jam Nut	MIL-DTL-38999 III	Crimp	Panel	46 A	Gold	Copper Alloy	38999 Aluminum	Each
Circular MIL Spec Connector 4P ST PLUG SZ 13 D38999/26WC4SA Amphenol Aerospace 1: $87.90 A tariff of 8% may be applied if shipping to the United States. 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	$87.90 $79.51 A tariff of 8% may be applied if shipping to the United States.	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 23P RCPT SZ 17 SCKT WL MNT D38999/20WE99SN Amphenol Aerospace 1: $130.71 A tariff of 8% may be applied if shipping to the United States. 46In Stock	Mfr. Part # D38999/20WE99SN Mouser Part # 654-D38999/20WE99SN	Amphenol Aerospace	Circular MIL Spec Connector 23P RCPT SZ 17 SCKT WL MNT Learn More about Amphenol Aerospace amphenol mil dtl 38999 iii connectors	Datasheet	46In Stock	$130.71 $102.56 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	No	23 Position	Socket (Female)	17-99	Receptacles	17	Wall Mount	MIL-DTL-38999 III	Crimp	Wall Mount	7.5 A, 13 A	Gold	Copper Alloy	38999 Aluminum