12-Hole Flange Gasket

The JAZ 12-hole flange gasket (MPN 850-301-01) is a precision-engineered sealing component purpose-built for fuel cell mounting applications, particularly in high-performance and racing vehicles where reliability is non-negotiable. This gasket serves as the critical interface between a fuel cell's 12-bolt flange connection and the vehicle's fuel system or bulkhead, preventing fuel leakage and maintaining system integrity under vibration and pressure cycling. Whether you're building a dedicated race car, restoring a classic performance vehicle, or upgrading a street machine with an aftermarket fuel cell, this component is essential for safe, leak-free operation.

Designed specifically for 12-bolt flange configurations, this gasket delivers consistent sealing performance across the fastener pattern while accommodating the slight surface irregularities inherent in cast aluminum or steel flanges. The compact dimensions of 6.15 x 6.35 inches and minimal thickness ensure proper flange clamping without excessive preload on bolt threads, while the lightweight construction at 0.05 lbs adds virtually nothing to your vehicle's mass. Gasket materials used in fuel cell applications must resist both fuel permeation and thermal cycling, and this JAZ component meets those demands with materials specifically formulated to maintain elasticity and seal integrity across operating temperature ranges and ethanol-blended fuel exposure.

Professionals installing aftermarket fuel cells—including road racers, autocrossers, and vintage hot rod builders—specify JAZ components for their proven compatibility with industry-standard flange designs and their ability to withstand sustained vibration without relaxation or creep. Installation is straightforward: position the gasket between the fuel cell flange and mounting surface, apply even bolt torque across all 12 fastener points to ensure uniform compression, and verify no fuel weeping occurs during system pressurization. This gasket is a one-piece, each-unit offering, making it ideal for initial fuel cell installation or as a replacement component when refurbishing an existing system.