| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 3.055 INCHES MINIMUM AND 3.115 INCHES MAXIMUM FIRST HOLE |
| FASTENER LENGTH | 3.225 INCHES MINIMUM AND 3.265 INCHES MAXIMUM |
| HEAD HEIGHT | 0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | NAS621,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MINIMUM TENSILE STRENGTH | 160000 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 | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 2.860 INCHES MINIMUM AND 2.880 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.440 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.266 INCHES MINIMUM AND 0.306 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNF |