R2X Racing Battery Bulkhead Connector 3/8" Post Black & Red — 440A Weatherproof Pass-Through

R2X Racing's heavy-duty bulkhead connector is a weatherproof 12V pass-through terminal with a 3/8" nickel-plated post, reinforced silicone gasket, and insulated boot—rated for continuous 440A and short-term 550A use.

This bulkhead connector is built to move large currents through panels and bulkheads without sacrificing corrosion resistance or sealing. Designed for marine, solar, and car audio installations, it combines a copper-core conductor and nickel-plated 3/8" post with a glass-filled nylon body and fiberglass-reinforced silicone gasket to keep moisture and debris out. The connector meets common industry safety expectations and is manufactured in the United States.

How does this connector keep water and dust out of my electrical panel?

The unit uses a reinforced silicone flange gasket and an IP65-rated insulator boot to prevent water spray and dust from reaching the terminal area. Screws or bolts through the flange and a threaded hex nut on the back side create a secure mechanical seal, minimizing movement that can break the weather barrier.

• IP65-rated insulator boot resists water spray and dust ingress
• Fiberglass-reinforced silicone gasket seals flange to panels up to 13/32" (0.40") thick
• Four flange holes allow additional mechanical fastening to prevent rotation

Can this connector handle high current for my battery or audio system?

Yes — the solid copper core and nickel-plated steel post are sized for heavy-duty current transfer. The connector is continuously rated at 440 amps at 12V and can carry up to 550 amps for short intervals (up to 12 minutes at an 80% duty cycle). Its construction tolerates higher torque during installation without the failure modes common to softer metal shafts.

• Continuous rating: 440A at 12VDC
• Peak short-term rating: 550A (up to 12 minutes, 80% duty cycle)
• Max voltage rating: 48VDC for broader system compatibility

Will this be easy to install and secure in my panel or hull?

Installation is simple: drill a 1.375" hole, feed the connector through, and tighten the large hex nut on the rear. The flange’s four holes accept screws or bolts to fix the connector in place and stop rotation when attaching heavy-gauge cable. The reinforced gasket keeps the interface sealed even when mounting to uneven surfaces.

• Requires 1.375" panel hole for pass-through
• Large hex nut secures connection from the backside
• Four flange mounting holes for added mechanical stability

What materials and standards are used in the connector?

The connector body is molded from glass-filled nylon for strength and heat resistance, while the electrical path uses a copper core with a nickel-plated 3/8" post for corrosion resistance. The gasket is fiberglass-reinforced silicone and the insulator boot meets IP65 weatherproofing and common USCG/ISO/ABYC expectations for exposed, energized terminals.

• Glass-filled nylon body for structural durability
• Solid copper core with nickel-plated steel post for high torque and corrosion resistance
• Fiberglass-reinforced silicone gasket and IP65-rated boot for environmental protection

Who this is for: installers, boat owners, solar technicians, and car audio enthusiasts who need a rugged, weatherproof battery pass-through terminal that carries heavy current and resists corrosion. If you require a reliable feed-through that can be bolted to a panel or bulkhead, survive marine environments, and accept high-torque terminations while remaining Made in the USA, this connector is a practical choice.