MS3476L22-21P PLUG CONNECTOR

MS3476A22-21P — 21-Way Black Hard-Anodised Aluminium MS3476 Plug Connector (Pin (Male))

The MS3476A22-21P is a 21-way black hard-anodised aluminium MS3476 circular mil-spec plug connector with pin (male) contacts, manufactured to MIL-DTL-26482 Series II standard. The MS3476 is the cable-mount plug counterpart to the MS3470 flanged receptacle, forming the mobile half of a panel or bulkhead circular connector pair. At 21 circuits, this connector handles the majority of ECU zone connector, main harness bulkhead, and PDM interface circuit requirements encountered in professional motorsport harness design.

MS3476 vs MS3470 — Plug and Receptacle Roles

The MS3476 and MS3470 are complementary halves of the same MIL-DTL-26482 Series II threaded-coupling connector system. The MS3476 is the cable-mount plug — it is wired to the harness and carries the male or female contact insert that engages with the mating MS3470 receptacle when assembled. The MS3470 is the panel or bulkhead-mount receptacle — it is fixed to the chassis, panel, or equipment body using its flanged mount and nut plate. Together, the MS3476 plug and MS3470 receptacle form a complete circular connector assembly with a threaded coupling that provides secure, vibration-resistant mating for all semi-permanent harness junction points in a race car or performance vehicle.

Threaded Coupling — Series II Connection Security

The MIL-DTL-26482 Series II threaded coupling mechanism provides a highly secure mated connection that resists accidental unmating under vibration, shock loads, and sustained high-G cornering. This makes the MS3476 and MS3470 the preferred choice for semi-permanent harness connections — engine block bulkhead feedthroughs, transmission tunnel connectors, chassis-to-body harness interfaces, and any junction point that remains mated throughout a race event and is only disconnected during service. For connectors requiring rapid pit lane engagement and disengagement, the bayonet-coupling MS3474/MS3471 Series I pairing may be more appropriate.

Shell Size 22 — Insert Arrangement -21P

Shell size 22 is suited to maximum-density large harness bulkhead connectors, primary ECU connectors, and full vehicle harness junction points. The -21P insert defines the exact contact pattern and gender. At 21 circuits, this connector handles the majority of ECU zone connector, main harness bulkhead, and PDM interface circuit requirements encountered in professional motorsport harness design. Always cross-reference the insert arrangement against the harness schematic before crimping to confirm the pin-out assignment matches the design intent.

Finish — Black Hard-Anodised Aluminium

The black hard-anodised finish provides the same corrosion resistance and mechanical durability as the traditional olive-drab treatment while delivering a visually distinctive appearance popular in professional motorsport harness builds. Both finish variants accept identical contact accessories and tooling.

Contact Type — Pin (Male)

Pin (male) contacts project from the insert face. Appropriate dust caps should protect exposed pin contacts during unmated storage and transport between service intervals. Contacts for this insert are size 16 or size 20 depending on the specific arrangement — consult the connector datasheet to confirm the correct contact part number and crimp die for the wire gauge in use.

Available from Arctic Performance Parts

Arctic Performance Parts stocks MS3476 circular plug connectors across all standard shell sizes and insert arrangements in both olive-drab and black anodised finishes, supporting professional motorsport harness builders and race car fabricators across Norway, Sweden, and Denmark. Lead time 1–2 weeks for quantities beyond current stock.