Header Bolt Kit - 6pt. 5/16-18 x 7/8 (20)

The Header Bolt Kit - 6pt. 5/16-18 x 7/8 (20) by STAGE 8 FASTENERS is a precision-engineered fastener set designed for high-performance engine builds, custom automotive applications, and demanding mechanical assemblies. Each kit contains 20 six-point bolts that meet strict tolerances required in motorsports, firearms platforms, and professional mechanical work. This is the fastener choice when standard hardware fails to deliver the reliability and consistency that mission-critical applications demand.

Six-point socket geometry distributes load more evenly across fastener flats than twelve-point designs, significantly reducing rounding and stripping—a critical advantage under vibration and thermal cycling. The 5/16-18 thread specification (5/16-inch diameter, 18 threads per inch) provides fine-pitch engagement ideal for applications requiring repeatable, controlled clamping force without over-torque risk. At 7/8-inch length, these bolts suit header applications, manifold work, and precision machinery where standard fasteners compromise performance. Stage 8 Fasteners' manufacturing tolerances ensure consistent head geometry and thread quality across all 20 units, eliminating the weak links common in bulk hardware.

Professional mechanics, engine builders, and tactical equipment manufacturers depend on this kit for header bolt replacement, custom AR-15 upper receiver builds, and equipment assembly where bolt integrity directly affects safety and function. The compact kit weight of 0.76 lbs makes it logistics-friendly for field technicians and armorers maintaining inventory. Verify thread pitch compatibility with your specific application before installation, as the 18 TPI specification differs from standard coarse-pitch fasteners. This is professional-grade hardware—no compromise components.