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High-Speed Quadrax Contacts

Amphenol Aerospace High-Speed Quadrax Contacts are made up of an outer contact with four inner contacts spaced to form two 100Ω or 150Ω controlled impedance differential pairs. Both contacts, when used in Amphenol MIL-DTL-38999 III and ARINC connectors, provide an excellent alternative for harsh environment applications. These applications include Ethernet 100 Base-T 100Ω, Gigabit Ethernet 1000 Base-T 100Ω, Fibre Channel 150Ω, IEEE1394B FireWire 110Ω. Amphenol Aerospace High-Speed Quadrax Contacts are gold-plated with crimp terminations. They offer low power consumption and EMI compatibility.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (PEN) Filter the results in the table by unit price based on your quantity.	Qty.	RoHS
Circular MIL Spec Contacts QUADRAX PI 21-033470-111 Amphenol Aerospace 1: S/ 988.85 49In Stock	Mfr. Part # 21-033470-111 Mouser Part # 654-21-033470-111	Amphenol Aerospace	Circular MIL Spec Contacts QUADRAX PI Learn More about Amphenol Aerospace quadrax contacts	Datasheet	49In Stock	S/ 988.85	Min.: 1 Mult.: 1
Circular MIL Spec Contacts 38999 I III PC Twinax 21-033456-001 Amphenol Aerospace 1: S/ 870.40 14In Stock	Mfr. Part # 21-033456-001 Mouser Part # 654-21-033456-001	Amphenol Aerospace	Circular MIL Spec Contacts 38999 I III PC Twinax	Datasheet	14In Stock	S/ 870.40 S/ 767.76 View S/ 740.24 S/ 734.79 Quote	Min.: 1 Mult.: 1
Circular MIL Spec Contacts PIN SZ 8 TWINAX ARINC600 140675 Amphenol Socapex 1: S/ 641.87 20In Stock	Mfr. Part # 140675 Mouser Part # 523-140675	Amphenol Socapex	Circular MIL Spec Contacts PIN SZ 8 TWINAX ARINC600 Learn More about Amphenol Socapex amphenol high speed contacts	Datasheet	20In Stock	S/ 641.87 S/ 589.09 View S/ 566.44 S/ 547.52 Quote	Min.: 1 Mult.: 1
Circular MIL Spec Contacts 38999 I II III CON 12 COAX PIN 21-033122-541 Amphenol Aerospace 1: S/ 155.78 16In Stock	Mfr. Part # 21-033122-541 Mouser Part # 654-21-033122-541	Amphenol Aerospace	Circular MIL Spec Contacts 38999 I II III CON 12 COAX PIN Learn More about Amphenol Aerospace quadrax contacts		16In Stock	S/ 155.78 S/ 135.46 View S/ 129.58 S/ 125.42 S/ 121.21 S/ 114.56 Quote	Min.: 1 Mult.: 1
Circular MIL Spec Contacts 38999 I III 8 DIFF TWX SKT CON 21-033388-071 Amphenol Aerospace 1: S/ 722.29 6In Stock	Mfr. Part # 21-033388-071 Mouser Part # 654-21-033388-071	Amphenol Aerospace	Circular MIL Spec Contacts 38999 I III 8 DIFF TWX SKT CON	Datasheet	6In Stock	S/ 722.29 View S/ 623.62 S/ 601.27 S/ 596.88 Quote	Min.: 1 Mult.: 1
Circular MIL Spec Contacts 38999 III 8 SKT CONCNTRC TWIN 21-033191-071 Amphenol Aerospace 1: S/ 1,861.94 3In Stock	Mfr. Part # 21-033191-071 Mouser Part # 654-21-033191-071	Amphenol Aerospace	Circular MIL Spec Contacts 38999 III 8 SKT CONCNTRC TWIN Learn More about Amphenol Aerospace quadrax contacts	Datasheet	3In Stock	S/ 1,861.94 View S/ 1,447.93	Min.: 1 Mult.: 1
Circular MIL Spec Contacts PIN SZ 8 TWINAX 600612 Amphenol Socapex 1: S/ 385.32 3In Stock	Mfr. Part # 600612 Mouser Part # 523-600612	Amphenol Socapex	Circular MIL Spec Contacts PIN SZ 8 TWINAX Learn More about Amphenol Socapex amphenol high speed contacts	Datasheet	3In Stock	S/ 385.32 View S/ 351.38 S/ 337.87 S/ 326.58 S/ 308.68 Quote	Min.: 1 Mult.: 1
Circular MIL Spec Contacts 8P 100 OHMS PIN 21-033387-131 Amphenol Aerospace 1: S/ 460.05 1In Stock	Mfr. Part # 21-033387-131 Mouser Part # 654-21-033387-131	Amphenol Aerospace	Circular MIL Spec Contacts 8P 100 OHMS PIN	Datasheet	1In Stock	S/ 460.05 View S/ 419.53 S/ 403.38 S/ 389.91 S/ 368.50 Quote	Min.: 1 Mult.: 1
Circular MIL Spec Tools, Hardware & Accessories TV 8 QDRAX METAL SEAL PLUG PCB 21-033899-8Q2 Amphenol Aerospace 1: S/ 57.38 53In Stock 105Expected 11/9/2026	Mfr. Part # 21-033899-8Q2 Mouser Part # 654-21-033899-8Q2	Amphenol Aerospace	Circular MIL Spec Tools, Hardware & Accessories TV 8 QDRAX METAL SEAL PLUG PCB Learn More about Amphenol Aerospace quadrax contacts	Datasheet	53In Stock 105Expected 11/9/2026	S/ 57.38 S/ 50.87 S/ 48.93 S/ 46.52 View S/ 44.34 S/ 40.44 S/ 37.84 S/ 33.59	Min.: 1 Mult.: 1
Circular MIL Spec Contacts JT Series MIL-DTL-38999 II 10-407863-342 Amphenol Aerospace 1: S/ 355.19 9In Stock	Mfr. Part # 10-407863-342 Mouser Part # 654-10-407863-342	Amphenol Aerospace	Circular MIL Spec Contacts JT Series MIL-DTL-38999 II	Datasheet	9In Stock	S/ 355.19 S/ 316.38 S/ 310.27 S/ 306.42 View S/ 295.67 Quote	Min.: 1 Mult.: 1	No
Circular MIL Spec Contacts 8P 100 OHMS PIN 21-033387-051 Amphenol Aerospace 1: S/ 1,281.10 1In Stock	Mfr. Part # 21-033387-051 Mouser Part # 654-21-033387-051	Amphenol Aerospace	Circular MIL Spec Contacts 8P 100 OHMS PIN	Datasheet	1In Stock	S/ 1,281.10 View S/ 1,165.26 S/ 1,123.49	Min.: 1 Mult.: 1
Circular MIL Spec Contacts CONTACT QUADRAX 21-033471-111 Amphenol Aerospace 1: S/ 1,341.94 44In Stock	Mfr. Part # 21-033471-111 Mouser Part # 654-21-033471-111	Amphenol Aerospace	Circular MIL Spec Contacts CONTACT QUADRAX Learn More about Amphenol Aerospace quadrax contacts	Datasheet	44In Stock	S/ 1,341.94 S/ 1,220.42 S/ 1,171.91	Min.: 1 Mult.: 1
Circular MIL Spec Contacts TWINAX CONTACT 21-033908-025 Amphenol Aerospace 1: S/ 829.57 3In Stock	Mfr. Part # 21-033908-025 Mouser Part # 654-21-033908-025	Amphenol Aerospace	Circular MIL Spec Contacts TWINAX CONTACT Learn More about Amphenol Aerospace quadrax contacts	Datasheet	3In Stock	S/ 829.57	Min.: 1 Mult.: 1	No
Fiber Optic Connectors CONTACT, FIBERQUAD, 10G, ROSA CF-170900-F01 Amphenol Aerospace 1: S/ 2,987.26 4In Stock	Mfr. Part # CF-170900-F01 Mouser Part # 654-CF170900F01	Amphenol Aerospace	Fiber Optic Connectors CONTACT, FIBERQUAD, 10G, ROSA Learn More about Amphenol Aerospace amphenol fiberquad quadrax contacts	Datasheet	4In Stock	S/ 2,987.26 View S/ 2,628.02	Min.: 1 Mult.: 1
Circular MIL Spec Contacts CONTACT 21-033384-031 Amphenol Aerospace 1: S/ 808.36 4In Stock	Mfr. Part # 21-033384-031 Mouser Part # 654-21-033384-031	Amphenol Aerospace	Circular MIL Spec Contacts CONTACT Learn More about Amphenol Aerospace quadrax contacts	Datasheet	4In Stock	S/ 808.36 View S/ 713.03 S/ 687.45 S/ 682.59 Quote	Min.: 1 Mult.: 1	No
Fiber Optic Connectors CONTACT, FIBERQUAD, 10G, TOSA CF-170900-E01 Amphenol Aerospace 1: S/ 3,340.58 2In Stock	Mfr. Part # CF-170900-E01 Mouser Part # 654-CF170900E01	Amphenol Aerospace	Fiber Optic Connectors CONTACT, FIBERQUAD, 10G, TOSA Learn More about Amphenol Aerospace amphenol fiberquad quadrax contacts	Datasheet	2In Stock	S/ 3,340.58	Min.: 1 Mult.: 1
Circular MIL Spec Contacts PIN SZ 8 TWINAX 600611 Amphenol Socapex 1: S/ 781.07 50In Stock	Mfr. Part # 600611 Mouser Part # 523-600611	Amphenol Socapex	Circular MIL Spec Contacts PIN SZ 8 TWINAX Learn More about Amphenol Socapex amphenol high speed contacts	Datasheet	50In Stock	S/ 781.07 S/ 688.97 S/ 664.29 S/ 659.51 View Quote	Min.: 1 Mult.: 1
Circular MIL Spec Contacts Bushing 21-033321-009 Amphenol Aerospace 1: S/ 277.38 75In Stock	Mfr. Part # 21-033321-009 Mouser Part # 654-21-033321-009	Amphenol Aerospace	Circular MIL Spec Contacts Bushing Learn More about Amphenol Aerospace quadrax contacts	Datasheet	75In Stock	S/ 277.38 S/ 246.59 S/ 237.09 S/ 229.19 View S/ 216.54 Quote	Min.: 1 Mult.: 1
Circular MIL Spec Contacts D38999/20MC35AN W/ PC CON 10-565997-440N Amphenol Aerospace 1: S/ 501.55 6In Stock	Mfr. Part # 10-565997-440N Mouser Part # 654-10-565997-440N	Amphenol Aerospace	Circular MIL Spec Contacts D38999/20MC35AN W/ PC CON		6In Stock	S/ 501.55 View S/ 495.09 S/ 492.28 S/ 489.95 Quote	Min.: 1 Mult.: 1
Circular MIL Spec Contacts 8P Pin use with Cbl PIC E6A3824 21-032904-021 Amphenol Aerospace 1: S/ 1,399.82 128In Stock 1Expected 12/7/2026	Mfr. Part # 21-032904-021 Mouser Part # 654-21-032904-021	Amphenol Aerospace	Circular MIL Spec Contacts 8P Pin use with Cbl PIC E6A3824 Learn More about Amphenol Aerospace amphenol octonet contacts	Datasheet	128In Stock 1Expected 12/7/2026	S/ 1,399.82 S/ 1,343.85	Min.: 1 Mult.: 1
Circular MIL Spec Contacts 8P Socket use W/ Cbl PIC E6A3824 21-032905-021 Amphenol Aerospace 1: S/ 2,771.58 46In Stock	Mfr. Part # 21-032905-021 Mouser Part # 654-21-032905-021	Amphenol Aerospace	Circular MIL Spec Contacts 8P Socket use W/ Cbl PIC E6A3824 Learn More about Amphenol Aerospace amphenol octonet contacts	Datasheet	46In Stock	S/ 2,771.58	Min.: 1 Mult.: 1
Circular MIL Spec Contacts Socket Contact 21-033101-027 Amphenol Aerospace 1: S/ 990.84 75In Stock	Mfr. Part # 21-033101-027 Mouser Part # 654-21-033101-027	Amphenol Aerospace	Circular MIL Spec Contacts Socket Contact Learn More about Amphenol Aerospace quadrax contacts		75In Stock	S/ 990.84 S/ 934.82 S/ 922.44	Min.: 1 Mult.: 1
Circular MIL Spec Contacts 38999 I III CON 8 PIN COAX 21-033102-041 Amphenol Aerospace 1: S/ 1,282.38 7In Stock	Mfr. Part # 21-033102-041 Mouser Part # 654-21-033102-041	Amphenol Aerospace	Circular MIL Spec Contacts 38999 I III CON 8 PIN COAX Learn More about Amphenol Aerospace quadrax contacts		7In Stock	S/ 1,282.38 View S/ 1,166.47 S/ 1,124.62	Min.: 1 Mult.: 1	No
RF Connectors / Coaxial Connectors CONTACT 21-033591-001 Amphenol Aerospace 1: S/ 730.12 206In Stock	Mfr. Part # 21-033591-001 Mouser Part # 654-21-033591-001	Amphenol Aerospace	RF Connectors / Coaxial Connectors CONTACT Learn More about Amphenol Aerospace quadrax contacts	Datasheet	206In Stock	S/ 730.12 S/ 660.79 S/ 645.07 S/ 630.08 View Quote	Min.: 1 Mult.: 1
RF Connectors / Coaxial Connectors COAX CONTACT 21-033592-001 Amphenol Aerospace 1: S/ 593.61 389In Stock 364Expected 11/4/2026	Mfr. Part # 21-033592-001 Mouser Part # 654-21-033592-001	Amphenol Aerospace	RF Connectors / Coaxial Connectors COAX CONTACT Learn More about Amphenol Aerospace quadrax contacts	Datasheet	389In Stock 364Expected 11/4/2026	S/ 593.61 S/ 569.82	Min.: 1 Mult.: 1

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