Hourglass Spacers 5/16inID x 1inOD x 1/4in

The Hourglass Spacers 5/16inID x 1inOD x 1/4in from ALLSTAR PERFORMANCE are precision aluminum spacers designed for high-performance engine and chassis applications where precise spacing and alignment are critical. These hourglass-profile spacers serve as load-distributing components in suspension systems, bearing assemblies, and drivetrain assemblies, protecting fasteners and distributing clamping force evenly across mating surfaces. They are essential for builders who demand tight tolerances and reliable performance in racing, restoration, and heavy-duty mechanical work.

Machined from aluminum in a natural finish, these spacers feature a distinctive hourglass geometry that centralizes load bearing and reduces stress concentration at bearing surfaces. The 5/16-inch inner diameter accommodates standard fasteners, while the 1-inch outer diameter provides a wide bearing surface for maximum load distribution. At 1/4-inch thick, they maintain structural rigidity while keeping overall assembly height compact. This design is particularly effective in rod ends, clevis joints, and suspension components where side loads and dynamic movement create wear patterns that standard flat washers cannot adequately manage.

These spacers are sold as a pair, making them ideal for symmetric applications such as dual-rod suspension systems, universal joints, or paired bearing assemblies common in custom racing chassis and high-performance vehicle builds. Installation is straightforward—simply position the spacer between the fastener head and the component being secured, or between mating surfaces requiring precise separation. The universal design works across aluminum, steel, and cast-iron components, and the natural aluminum finish resists corrosion while remaining compatible with both wet and dry environments. Builders and mechanics who prioritize alignment accuracy and fastener longevity consistently specify ALLSTAR PERFORMANCE spacers.