Shim Washer - 1.0 OD x 5/8 ID x .045

The Shim Washer – 1.0 OD x 5/8 ID x .045 is a precision-engineered spacer component designed for firearms assembly, equipment mounting, and tactical gear construction. Originally specified by T AND D MACHINE, this shim washer serves as a critical alignment and spacing element in bolt-together assemblies where dimensional accuracy directly impacts function and safety. Whether you're building custom AR platforms, assembling suppressor mounts, or repairing duty weapons, proper shimming prevents binding, ensures correct headspace, and maintains zero-shift on optics and accessories.

This shim washer features a 1.0-inch outer diameter with a 5/8-inch inner diameter and a .045-inch nominal thickness—specifications that align with standard mil-spec and commercial firearm component tolerances. The .045 thickness sits between common .040 and .050 shim stock, making it ideal for fine-tuning alignment in tight tolerance assemblies where single-shim solutions would leave gaps or double-shim stacking would create preload issues. At 0.01 pounds, the minimal weight ensures it introduces no functional burden to recoil systems or mounting hardware while maintaining the dimensional precision required for repeatable accuracy and consistent performance.

Armorer's, gunsmiths, and maintenance personnel rely on precision shims for muzzle device timing, scope base leveling, and bolt carrier group fit within upper receivers. This washer's nominal .045-inch thickness pairs well with standard fastener hardware in the 5/8-inch bore range, making it compatible with most common military and civilian firearm assembly protocols. Stock this component in your maintenance kit for field adjustments, custom builds, or warranty repairs where out-of-spec tolerances demand corrective shimming without full component replacement.