7. Drawing - 6656402.pdf

This technical drawing is a detailed engineering specification for a Naval Surface Warfare Center 138 Norma Headspace Gage Set (Part Number 6656402), depicting a precision-machined cylindrical tool made of tool steel (AISI Type G1 or G2, per ASTM A681-08). The document provides comprehensive dimensional drawings with multiple cross-sectional views, including precise measurements with tight tolerances ranging from 45° angles to specific diameter specifications.

The drawing includes a comprehensive part number table listing multiple versions of the component (versions G0 through REJECT), with varying dimensional tolerances specified to thousandths of an inch. Heat treatment is specified as RC 57-62, and the drawing notes that the 20.063 max feature is optional and may be omitted from finished part design. The technical specification appears to be for a specialized measurement or calibration instrument likely used in naval engineering or precision manufacturing contexts, with intricate machining requirements and multiple potential configuration variations.