| FASTENER LENGTH | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM |
| HEAD HEIGHT | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| NONSTANDARD THREAD PITCH DIAMETER | +0.3299 TO 0.3344 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.083 INCHES MINIMUM AND 0.103 INCHES MAXIMUM |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| SECONDARY WASHER MATERIAL THICKNESS | 0.083 INCHES MINIMUM AND 0.103 INCHES MAXIMUM |
| SECONDARY WASHER OUTSIDE DIAMETER | 0.997 INCHES MINIMUM AND 1.103 INCHES MAXIMUM |
| SECONDARY WASHER RELATIONSHIP TO PRIMARY WASHER | NOT IDENTICAL |
| SECONDARY WASHER STYLE | FLAT |
| WASHER QUANTITY | 2 |
| WIDTH BETWEEN FLATS | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM |
| SURFACE TREATMENT | CADMIUM OR ZINC OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.770 INCHES MINIMUM AND 0.776 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 20 |