| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 1.638 INCHES MINIMUM AND 1.668 INCHES MAXIMUM |
| GRIP DIAMETER | 0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM |
| GRIP LENGTH | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM |
| HEAD DIAMETER | 0.464 INCHES MINIMUM AND 0.506 INCHES MAXIMUM |
| HEAD STYLE | FLAT COUNTERSUNK |
| INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) |
| MATERIAL | |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, FLUSH HEAD |
| SURFACE TREATMENT | |
| THREAD LENGTH | 0.378 INCHES MINIMUM AND 0.428 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |