| FASTENER LENGTH | 1.490 INCHES MINIMUM AND 1.510 INCHES MAXIMUM |
| HEAD DIAMETER | 1.090 INCHES MINIMUM AND 1.110 INCHES MAXIMUM |
| HEAD HEIGHT | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM |
| HEAD STYLE | ROUND W/WRENCH FLATS CHAMFERED |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| NOMINAL THREAD DIAMETER | 0.497 INCHES |
| SHOULDER DIAMETER | 0.495 INCHES MINIMUM AND 0.500 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER DIAMETER | 0.580 INCHES NOMINAL SECOND SHOULDER |
| SHOULDER LENGTH | 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER SHAPE | ROUND ALL SHOULDERS |
| SHOULDER LENGTH | 0.625 INCHES MINIMUM AND 0.660 INCHES MAXIMUM SECOND SHOULDER |
| SPECIAL FEATURES | FURNISHED WITH UNDERCUT 0.424 IN. MIN. 0.429 IN. MAX DIA; 0.125 IN. NOM LENGTH |
| WIDTH BETWEEN FLATS | 0.780 INCHES MINIMUM AND 0.785 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.515 INCHES MINIMUM AND 0.550 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNJS |