| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM |
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER | 1.312 INCHES NOMINAL |
| FASTENER LENGTH | 1.927 INCHES MINIMUM AND 1.947 INCHES MAXIMUM |
| FEATURES PROVIDED | CASEHARDENED |
| FIRST DIAMETER FROM HEAD | 0.278 INCHES MINIMUM AND 0.280 INCHES MAXIMUM |
| HEAD HEIGHT | 0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM |
| HEAD DIAMETER | 0.577 INCHES MINIMUM AND 0.579 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | BS HRS NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE |
| MATERIAL | STEEL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SECOND DIAMETER FROM HEAD | 0.190 INCHES MINIMUM AND 0.195 INCHES MAXIMUM |
| SPECIAL FEATURES | HEAD W/3 SLOTS AND 3 SCALLOPS, HEAD MARKED HT';52 HEAD STYLE |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.605 INCHES MINIMUM AND 0.645 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNF |