| FASTENER LENGTH | 3.750 INCHES NOMINAL |
| HARDNESS RATING | 95.0 ROCKWELL B MAXIMUM OVERALL |
| HEAD HEIGHT | 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM |
| HEAD DIAMETER | 1.032 INCHES MINIMUM AND 1.094 INCHES MAXIMUM |
| HEAD STYLE | BUTTON |
| NECK LENGTH | 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM |
| NECK WIDTH | 0.492 INCHES MINIMUM AND 0.515 INCHES MAXIMUM |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| MATERIAL DOCUMENT AND CLASSIFICATION | GM 255M,GENERAL MOTORS CORP MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| MINIMUM TENSILE STRENGTH | 55000 POUNDS PER SQUARE INCH |
| MINIMUM YIELD STRENGTH | 40000 POUNDS PER SQUARE INCH |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.250 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 13 |
| THREAD SERIES DESIGNATOR | UNC |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | 4252-M,FSCM 24617 MFR REF ALL TREATMENT RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL OR ZINC OVERALL |