| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.675 INCHES MINIMUM AND |
| 0.690 INCHES MAXIMUM |
| FASTENER LENGTH | 3.900 INCHES NOMINAL |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | JH 153,FSCM 81205 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OR |
| CHROMIUM OR |
| CHROMATE ZINC HEAD |
| CHROMATE ZINC GRIP |
| CADMIUM OR |
| CHROMATE ZINC THREADS |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | JH115,FSCM 77272 MFR REF 1ST TREATMENT RESPONSE OR |
| QQ-C-320,CLASS 2 FED SPEC 2ND TREATMENT RESPONSE HEAD |
| QQ-C-320,CLASS 2 FED SPEC 2ND TREATMENT RESPONSE GRIP |
| JH115,FSCM 77272 MFR REF 1ST TREATMENT RESPONSE OR |
| QQ-C-320,CLASS 2 FED SPEC 2ND TREATMENT RESPONSE THREADS |
| MINIMUM TENSILE STRENGTH | 240000 POUNDS PER SQUARE INCH |
| STYLE DESIGNATOR | CONCENTRIC HOLE UNTHREADED |
| SHOULDER DIAMETER | 0.8740 INCHES MINIMUM AND |
| 0.8745 INCHES MAXIMUM |
| SHOULDER LENGTH | 3.170 INCHES MINIMUM AND |
| 3.175 INCHES MAXIMUM |
| CONCENTRIC HOLE DEPTH | 2.990 INCHES MINIMUM AND |
| 3.010 INCHES MAXIMUM |
| CONCENTRIC HOLE DIAMETER | 0.540 INCHES MINIMUM AND |
| 0.560 INCHES MAXIMUM |
| HEAD STYLE | DEE |
| HEAD DIAMETER | 1.490 INCHES MINIMUM AND |
| 1.510 INCHES MAXIMUM |
| HEAD HEIGHT | 0.190 INCHES MINIMUM AND |
| 0.210 INCHES MAXIMUM |
| DISTANCE FROM CENTERLINE TO FLAT | 0.605 INCHES MINIMUM AND |
| 0.625 INCHES MAXIMUM |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 3.785 INCHES MINIMUM AND |
| 3.805 INCHES MAXIMUM FIRST HOLE |
| SHANK UNTHREADED HOLE DIAMETER | 0.030 INCHES MINIMUM AND |
| 0.040 INCHES MAXIMUM FIRST HOLE |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 77272 |
| DESIGN CONTROL REFERENCE | 114L1057-1 |