| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.437 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.520 INCHES NOMINAL |
| FASTENER LENGTH | 1.750 INCHES NOMINAL |
| MATERIAL | STEEL COMP 4340 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 40.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| STYLE DESIGNATOR | COUNTERBORE UNTHREADED |
| SHOULDER DIAMETER | 0.5607 INCHES MINIMUM AND |
| 0.5616 INCHES MAXIMUM |
| SHOULDER LENGTH | 1.230 INCHES NOMINAL |
| CONCENTRIC HOLE DEPTH | 1.718 INCHES MINIMUM AND |
| 1.750 INCHES MAXIMUM |
| COUNTERBORE DIAMETER | 0.125 INCHES MINIMUM AND |
| 0.126 INCHES MAXIMUM |
| COUNTERBORE DEPTH | 0.156 INCHES MINIMUM AND |
| 0.187 INCHES MAXIMUM |
| CONCENTRIC HOLE DIAMETER | 0.092 INCHES MINIMUM AND |
| 0.097 INCHES MAXIMUM |
| HEAD STYLE | ROUND W/WRENCH FLATS |
| HEAD DIAMETER | 0.937 INCHES NOMINAL |
| HEAD HEIGHT | 0.187 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.745 INCHES MINIMUM AND |
| 0.755 INCHES MAXIMUM |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 0.625 INCHES NOMINAL FIRST HOLE |
| SHANK UNTHREADED HOLE DIAMETER | 0.061 INCHES MINIMUM AND |
| 0.066 INCHES MAXIMUM FIRST HOLE |
| SPECIAL FEATURES | SHOULDER EXTERNALLY RELIEVED 0.250 IN. W BY 0.031 IN DEEP LOCATED 0.500 IN. FROM HEAD BEARING SURFACE |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 79RG9 |
| DESIGN CONTROL REFERENCE | 123AMM12136-5 |