AIA NAS988:2021

This document provides the aerospace industry with the uniform standard for the procurement of precision double-margin carbide twist drills. Utilization of the specified drills in accordance with recommended applications will ensure the performance of precision close-tolerance drilling tasks with optimum quality, reliability, and economy. Included in the standard are ordering requirements, drill design parameters, pertinent nomenclature, and point geometries, suggested areas of application, acceptable carbide materials, and a Glossary of Terms defining relative terminology.