| FASTENER LENGTH | 0.814 INCHES MINIMUM AND 0.820 INCHES MAXIMUM |
| HARDNESS RATING | 320.0 BRINELL STANDARD MINIMUM AND 360.0 BRINELL STANDARD MAXIMUM OVERALL |
| HEAD HEIGHT | 0.375 INCHES MINIMUM AND 0.378 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| INTERNAL THREAD CLASS | 3B CONCENTRIC HOLE |
| INTERNAL THREAD DIRECTION | RIGHT-HAND CONCENTRIC HOLE |
| INTERNAL THREAD LENGTH | 1.192 INCHES NOMINAL CONCENTRIC HOLE |
| MATERIAL DOCUMENT AND CLASSIFICATION | AISI 4340 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4340 OVERALL |
| NOMINAL THREAD DIAMETER | 0.750 INCHES |
| NOMINAL THREAD SIZE | 0.312 INCHES CONCENTRIC HOLE |
| WIDTH BETWEEN FLATS | 1.000 INCHES NOMINAL |
| STYLE DESIGNATOR | CONCENTRIC HOLE THREADED |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | TT-C-490 TY 1 ASSN STD 1ST TREATMENT RESPONSE OR DOD-P-132 TY M CL 1 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE ZINC OR PHOSPHATE MANGANESE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.617 INCHES MINIMUM AND 0.633 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 10 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) CONCENTRIC HOLE |
| THREADS PER INCH | 18 CONCENTRIC HOLE |