| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 24 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.500 INCHES MINIMUM AND |
| 0.580 INCHES MAXIMUM |
| FASTENER LENGTH | 1.420 INCHES MINIMUM AND |
| 1.440 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND |
| 32.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | FILLISTER |
| HEAD DIAMETER | 0.580 INCHES MINIMUM AND |
| 0.590 INCHES MAXIMUM |
| HEAD HEIGHT | 0.070 INCHES MINIMUM AND |
| 0.090 INCHES MAXIMUM |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| SHOULDER DIAMETER | 0.407 INCHES MINIMUM AND |
| 0.408 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.810 INCHES MINIMUM AND |
| 0.840 INCHES MAXIMUM FIRST SHOULDER |
| RIB QUANTITY | 40 |
| RIB MAJOR DIAMETER | 0.415 INCHES MINIMUM AND |
| 0.419 INCHES MAXIMUM |
| RIB LENGTH | 0.140 INCHES MINIMUM AND |
| 0.200 INCHES MAXIMUM |
| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.050 INCHES MINIMUM AND |
| 0.070 INCHES MAXIMUM |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.310 INCHES MINIMUM AND |
| 1.350 INCHES MAXIMUM FIRST HOLE |
| SHANK UNTHREADED HOLE DIAMETER | 0.088 INCHES MAXIMUM FIRST HOLE |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 77445 |
| DESIGN CONTROL REFERENCE | 128466P30 |