Spacers — Nas43

are precision-engineered mechanical fasteners designed to provide specific clearance gaps and alignment between components in high-stress assemblies. As a staple of the National Aerospace Standards (NAS), these spacers are universally recognized for their reliability, traceability, and strict adherence to geometric tolerances. What are NAS43 Spacers?

In an aircraft assembly, thousands of parts are bolted together. Engineers calculate the exact "grip length" of a bolt to ensure the fastener is tight but not over-stressed. A standard hardware store washer might vary in thickness by a few thousandths of an inch. A NAS43 spacer is manufactured to a precise thickness. Using them ensures that the structural stack-up remains exactly as the engineers intended. nas43 spacers

The following tables provide detailed specifications for NAS43 spacers: In an aircraft assembly, thousands of parts are

A NAS43 spacer is an unthreaded, round "sleeve" or "bushing" style spacer. Unlike standoffs, which have internal or external threads, NAS43 spacers feature a clear, smooth through-hole. They are typically used with a screw or bolt that passes through the center to hold two parts at a fixed distance. A NAS43 spacer is manufactured to a precise thickness