| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.030 INCHES MINIMUM AND 0.090 INCHES MAXIMUM |
| DISTANCE FROM CENTERLINE TO FLAT | 0.156 INCHES MINIMUM AND 0.176 INCHES MAXIMUM |
| FASTENER LENGTH | 1.270 INCHES MINIMUM AND 1.300 INCHES MAXIMUM |
| HARDNESS RATING | 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.624 INCHES NOMINAL |
| HEAD HEIGHT | 0.188 INCHES NOMINAL |
| HEAD STYLE | DEE |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 1335 OR STEEL COMP 1541 OVERALL |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| RIB LENGTH | 0.260 INCHES NOMINAL |
| RIB MAJOR DIAMETER | 0.317 INCHES MINIMUM AND 0.321 INCHES MAXIMUM |
| RIB MINOR DIAMETER | 0.303 INCHES MINIMUM AND 0.307 INCHES MAXIMUM |
| RIB QUANTITY | 33 |
| SHOULDER DIAMETER | 0.303 INCHES MINIMUM AND 0.307 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.320 INCHES NOMINAL FIRST SHOULDER |
| SHOULDER SHAPE | RIBBED FIRST SHOULDER |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.830 INCHES MINIMUM AND 0.860 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 24 |