| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.875 INCHES MINIMUM |
| FASTENER LENGTH | 4.250 INCHES NOMINAL |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | GM255-M FSCM 24617 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OR |
| ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | 4252-M MFR REF SINGLE TREATMENT RESPONSE OR |
| 4252-M FSCM 24617 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 95.0 ROCKWELL B MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 55000 POUNDS PER SQUARE INCH |
| MINIMUM YIELD STRENGTH | 40000 POUNDS PER SQUARE INCH |
| HEAD STYLE | BUTTON |
| HEAD DIAMETER | 0.688 INCHES MINIMUM AND |
| 0.719 INCHES MAXIMUM |
| HEAD HEIGHT | 0.156 INCHES MINIMUM AND |
| 0.176 INCHES MAXIMUM |
| NECK LENGTH | 0.156 INCHES MINIMUM AND |
| 0.187 INCHES MAXIMUM |
| NECK WIDTH | 0.307 INCHES MINIMUM AND |
| 0.324 INCHES MAXIMUM |