| FASTENER LENGTH | 0.680 INCHES NOMINAL |
| HARDNESS RATING | 50.0 ROCKWELL D MINIMUM AND 56.0 ROCKWELL D MAXIMUM OVERALL |
| HEAD HEIGHT | 0.122 INCHES MINIMUM AND 0.127 INCHES MAXIMUM |
| HEAD LENGTH | 0.697 INCHES MINIMUM AND 0.700 INCHES MAXIMUM |
| HEAD STYLE | TEE NO. 3 |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A-322 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A-331 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A-322 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A-331 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A-322 ASSN STD 3RD MATERIAL RESPONSE OR ASTM A-331 ASSN STD 3RD MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4140 OR STEEL COMP 8640 OR STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| SPECIAL FEATURES | UNTHREADED LENGTH 0.38 IN. DIA |
| WIDTH BETWEEN FLATS | 0.480 INCHES MINIMUM AND 0.490 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-P-16232 TYPE M CLASS 1 MIL SPEC 1ST TREATMENT RESPONSE OR MIL-P-16232 TYPE Z CLASS 1 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE MANGANESE OR PHOSPHATE ZINC OVERALL |
| THREAD CLASS | 3A |
| THREAD LENGTH | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES DESIGNATOR | UNF |