| FASTENER LENGTH | 4.000 INCHES NOMINAL |
| HARDNESS RATING | 60.0 ROCKWELL B MINIMUM OVERALL |
| HEAD HEIGHT | 0.195 INCHES MINIMUM AND 0.235 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL | STEEL OVERALL |
| MINIMUM TENSILE STRENGTH | 55000 POUNDS PER SQUARE INCH |
| NONMACHINE NOMINAL THREAD DIAMETER | 0.312 INCHES |
| NONMACHINE THREAD STYLE | GIMLET POINT (TYPE A, AB OR BA) |
| SHOULDER DIAMETER | 0.298 INCHES MINIMUM AND 0.324 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.125 INCHES MINIMUM OVERALL |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| WIDTH BETWEEN FLATS | 0.484 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM A153-60 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |