| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| FASTENER LENGTH | 0.85 INCHES NOMINAL |
| MATERIAL | STEEL COMP 303 OR |
| STEEL COMP 304 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTMA582 ASSN STD SINGLE MATERIAL RESPONSE OR |
| ASTMA276 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTMA967 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HEAD STYLE | FLAT COUNTERSUNK UNDERCUT |
| HEAD DIAMETER | 0.560 INCHES NOMINAL |
| HEAD HEIGHT | 0.62 INCHES NOMINAL |
| CHAMFER ANGLE | 45.0 DEGREES NOMINAL |
| INTERNAL DRIVE STYLE | SLOT |
| SHOULDER SHAPE | ROUND ALL SHOULDERS |
| SHOULDER DIAMETER | 0.437 INCHES NOMINAL FIRST SHOULDER |
| 0.312 INCHES NOMINAL SECOND SHOULDER |
| SHOULDER LENGTH | 0.162 INCHES NOMINAL FIRST SHOULDER |
| 0.260 INCHES NOMINAL SECOND SHOULDER |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SHOULDER SCREW |