| FASTENER LENGTH | 1.050 INCHES NOMINAL |
| HARDNESS RATING | 248.0 BRINELL STANDARD MINIMUM AND 321.0 BRINELL STANDARD MAXIMUM |
| HEAD HEIGHT | 0.170 INCHES MINIMUM AND 0.175 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | BS S80 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| MINIMUM TENSILE STRENGTH | 123200 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| SPECIAL TEST FEATURES | NPPO(AIR)/508522/401A DATED 21/09/00 |
| WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.650 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES DESIGNATOR | UNF |