SAMMI Drawings.pdf

This document is a technical specification image containing detailed engineering drawings for firearm cartridge headspace gauges.

Figure I illustrates shoulder-breaching centerfire rifle headspace gauges with dimensional specifications including critical measurements such as B = 0.0 (0.029), K = .210 (0.25), and various tolerance parameters. The gauge design includes a partial view of the extraction clearance feature and notes referencing millimeters, basic dimensions, and center points for inspection datum definition. Material specifications indicate SAE4140 or equivalent steel heat treated to Rc 62-65, with specific tolerances and surface finish requirements noted.

Figure II presents belt-breaching centerfire rifle headspace gauges with comparable technical specifications. Key dimensions include B = .050 (0.25), K = .090 (0.25), and E1 = .0006 (0.0035). This design features a sharp corner with no radius grinding noted as optional, and includes a partial view of the extractor clearance feature. Material requirements are identical to Figure I, specified as SAE4140 or equivalent steel heat treated to Rc 62-65, with all tolerances ± 0.002 (0.05) except as noted and surface finish specifications applied uniformly. Both figures provide comprehensive dimensional data essential for manufacturing precision firearm inspection and measurement equipment.