Jack Bolt Collar 1-1/8in-12 10pk

The ALLSTAR PERFORMANCE Jack Bolt Collar 1-1/8in-12 10-pack is a specialized fastening component designed for engine builders and technicians who require precision in critical assembly areas. These collars are specifically engineered to fit 1-1/8 inch diameter fastener applications with a 12 threads-per-inch (TPI) specification, ensuring proper load distribution and alignment around jack bolts.

The collars serve as spacers and alignment tools, preventing fastener pull-through when applying high clamping force to engine blocks, cylinder heads, or structural components. Their design allows for even pressure distribution across the bolt head shoulder, minimizing the risk of surface damage or thread stripping that can occur with direct head contact.

Ideal for small-block or big-block assembly work, the 10-pack quantity ensures that mechanics have enough collars for multi-stage builds or shop repairs. Each collar is manufactured to ALLSTAR PERFORMANCE standards, guaranteeing dimensional consistency and reliable performance across repeated use cycles typical in racing and restoration environments.