| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.450 INCHES MINIMUM AND 0.470 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.010 INCHES MINIMUM AND 0.015 INCHES MAXIMUM |
| FASTENER LENGTH | 1.640 INCHES MINIMUM AND 1.660 INCHES MAXIMUM |
| HARDNESS RATING | 35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.880 INCHES MINIMUM AND 0.900 INCHES MAXIMUM |
| HEAD HEIGHT | 0.115 INCHES NOMINAL |
| HEAD STYLE | FLAT EXTENDED WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 8740 OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| RIB INCLUDED ANGLE | 45.0 DEGREES NOMINAL |
| RIB LENGTH | 0.340 INCHES NOMINAL |
| RIB MAJOR DIAMETER | 0.279 INCHES MINIMUM AND 0.281 INCHES MAXIMUM |
| RIB MINOR DIAMETER | 0.260 INCHES MINIMUM AND 0.266 INCHES MAXIMUM |
| RIB QUANTITY | 35 |
| SHOULDER DIAMETER | 0.279 INCHES MINIMUM AND 0.281 INCHES MAXIMUM SECOND SHOULDER |
| SHOULDER DIAMETER | 0.285 INCHES MINIMUM AND 0.295 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.060 INCHES NOMINAL FIRST SHOULDER |
| SHOULDER LENGTH | 0.340 INCHES NOMINAL SECOND SHOULDER |
| SHOULDER SHAPE | RIBBED SECOND SHOULDER |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.490 INCHES MINIMUM AND 0.570 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 28 |