| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 2.275 INCHES MINIMUM AND 2.325 INCHES MAXIMUM FIRST HOLE |
| FASTENER LENGTH | 2.463 INCHES MINIMUM AND 2.493 INCHES MAXIMUM |
| HEAD HEIGHT | 0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE |
| SHOULDER DIAMETER | 0.3090 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| SHOULDER LENGTH | 2.010 INCHES MINIMUM AND 2.025 INCHES MAXIMUM FIRST SHOULDER |
| WIDTH BETWEEN FLATS | 0.490 INCHES MINIMUM AND 0.502 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.367 INCHES MINIMUM AND 0.448 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |