Hourglass Spacers 5/16inID x 1inOD x 1-1/2

The Hourglass Spacers 5/16inID x 1inOD x 1-1/2 from ALLSTAR PERFORMANCE are precision-engineered aluminum standoffs designed for engine builders, suspension technicians, and performance mechanics who demand accuracy in component spacing. These hourglass-profile spacers excel in high-vibration environments where conventional washers fail, maintaining consistent clearance between fastened parts under thermal cycling and mechanical stress. Whether you're assembling a race engine, installing accessory brackets, or spacing suspension components, these spacers deliver the rigidity and reliability that serious automotive work demands.

The 5/16-inch inner diameter accommodates standard 5/16-inch fasteners, while the 1-inch outer diameter provides substantial bearing surface to distribute load without crushing delicate housings or composite materials. The 1-1/2-inch length gives you flexibility in spacing applications where intermediate clearance is critical, such as between engine block and bracket assemblies or within suspension geometry adjustments. The hourglass profile—wider at both ends, narrower at the center—maximizes structural rigidity while minimizing weight, a design principle proven across thousands of championship race builds and OEM performance applications. Aluminum construction resists corrosion without sacrificing strength, and the precise machining ensures zero runout when installed with proper torque.

Professional mechanics and engine builders rely on these spacers for crankshaft girdle systems, accessory drive mounting, and any application requiring vibration-damped standoff spacing. The compact 0.13-pound weight makes them ideal for weight-conscious performance builds without compromising load capacity. Sold as individual units, you can build custom spacing solutions for multiple fastening points—essential when fabricating custom engine mounts or multi-point bracket systems. Pair them with appropriate fasteners and apply consistent torque to achieve optimal clamping force while preventing fastener rotation or micro-movement that degrades mechanical integrity over extended operation.