K-MOTOR PERFORMANCE M12x1.25 Banjo Bolt Kit — M12 banjo fitting with 1/8" NPT port and crush washers

K-MOTOR PERFORMANCE M12x1.25 banjo bolt kit is a compact, versatile fitting that lets you route fuel, oil, coolant, water or air through a banjo-style connection with a sealed, 1/8" NPT-access port.

This banjo bolt assembly is engineered to fit standard 12mm banjo adapters and offers a universal solution for fluid and gas lines across automotive, motorcycle, marine and industrial applications. The bolt’s M12 x 1.25 threads and the upper 1/8" NPT port provide a secure mechanical connection while allowing pressure-sensing or auxiliary tapping through the NPT opening. The kit ships with two crush washers to ensure a leak-resistant seal when installed.

How does this banjo bolt work with common fuel and oil systems?

The banjo bolt passes fluid through a hollow center and radiating holes into the joined fitting, creating a low-profile, leak-minimizing connection ideal for tight spaces. The included 1/8" NPT upper port accepts sensors, bleeders, or small tubing for additional plumbing or pressure monitoring. Installation is straightforward and uses standard 12mm banjo adapter geometry.

• Hollow M12 bolt body routes fluid through the banjo fitting
• Upper 1/8" NPT port allows tapping for sensors or auxiliary lines
• Two crush washers included to ensure a sealed joint
• Works with fuel, oil, coolant, water and compressed air

What are the exact thread and compatibility specifications?

The bolt uses an M12 x 1.25 external thread, matching most 12mm banjo adapters and fittings. The top-facing hole is threaded to 1/8" NPT, giving you an industry-standard female port for small fittings or sensor adapters. Check your component thread pitches; this kit is tailored for M12 x 1.25 systems.

• External thread: M12 x 1.25 for banjo adapter compatibility
• Upper access port: 1/8" NPT for sensors and fittings
• Suitable for most 12mm banjo-style adapters and assemblies
• Includes two washers sized for reliable crush sealing

How do I install it and avoid leaks?

Installation requires seating the bolt through the banjo fitting with one crush washer on each side and tightening to the manufacturer’s torque spec for a crush seal. Use the 1/8" NPT port for accessory plumbing before final torque if adding sensors or bleed lines. Inspect the washers for proper compression and retighten after initial heat cycles if necessary.

• Place one washer on each side of the banjo fitting before tightening
• Tighten to the vehicle or component manufacturer’s torque spec
• Fit sensors or tubing to the 1/8" NPT port prior to final torque if needed
• Recheck for leaks after first run and after heating/cooling cycles

Who this is for: technicians, DIY mechanics, performance hobbyists and fabricators who need a compact, multi-fluid banjo fitting with an auxiliary 1/8" NPT access point. If you work on fuel injection lines, oil feeds, coolant bypasses, or custom pneumatic circuits and require a reliable M12 x 1.25 banjo solution with easy sensor or secondary line attachment, this K-MOTOR PERFORMANCE kit is designed to simplify plumbing and reduce leak risk while maintaining compatibility with common 12mm banjo hardware.