Drawings.pdf
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- Attached to
- Headspace Gauges
- Solicitation number
- N0016426Q0079
About this file
This document contains technical specifications and gauge drawings for shoulder-breeching and belt-breeching centerfire rifle headspace gauges used in firearm manufacturing and quality control.
The document provides detailed specifications for nine cartridge types including 6.5 Creedmoor, 7.62x39, 7.62x51 (NATO), 300 AAC Blackout, 300 Norma Magnum, 300 Winchester Magnum, 338 Norma Magnum, 5.56mm (NATO, ARMY), and 277 Fury. For each cartridge, the specifications include "F" (GO-MINIMUM) measurements, "F" (NO-GO MAXIMUM) measurements in inches with tolerances of ±.0002 inches, and an "M" dimension. The document contains two primary technical drawings: Figure I illustrating shoulder-breeching centerfire rifle headspace gauges with detailed dimensional callouts, material specifications (SAE4340 steel or equivalent), heat treatment requirements (to Rc 60-64), and surface finish specifications; and Figure II depicting belt-breeching centerfire rifle headspace gauges with similar material and processing requirements. Both figures include notes regarding inspection procedures, datum definitions, and tolerance specifications. The technical drawings reference NATO standards for certain cartridges and include SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) specifications for belted cartridges. This document serves as a technical specification and quality control reference for manufacturers producing firearms and ammunition components.
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Text version
CARTRIDGE
“F” (GO- MINIMUM)) +.0002
(inches)
“F” (NO-GO MAXIMUM)) -.0002
(inches)
M
6.5 Creedmoor
1.541
1.551
.400
7.62 x 39
1.252
1.262
.3662
7.62x51 (NATO)*
1.6300
1.6400
300 AAC Blackout
1.0789
1.0889
.351
300 Norma Magnum
2.036
2.046
.455
300 Winchester Magnum** .220 .227 .533
338 Norma Magnum
2.0101
2.0201
.475
5.56mm (NATO, ARMY)*
1.4646
1.4730
.330
277 Fury
1.6800
1.6870
*NATO Reference drawings attached after table.
** 300 Winchester Magnum is belted see Belt-Breeching SAAMI drawing.
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