| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FF-S-107 |
| NONMACHINE THREAD STYLE | DOUBLE FLUTE (TYPE F) |
| NONMACHINE NOMINAL THREAD DIAMETER | 0.312 INCHES |
| FASTENER LENGTH | 0.470 INCHES NOMINAL |
| MATERIAL | STEEL COMP 1020 OR |
| STEEL COMP 1021 OR |
| STEEL COMP 1022 OR |
| STEEL COMP 1023 OR |
| STEEL COMP 1524 OVERALL |
| SURFACE TREATMENT | ZINC AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B633 TY 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND |
| 50.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | HEXAGON EXTENDED WASHER |
| HEAD HEIGHT | 0.264 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.500 INCHES NOMINAL |
| EXTENDED WASHER DIAMETER | 0.624 INCHES MINIMUM AND |
| 0.676 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.035 INCHES MINIMUM AND |
| 0.055 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| FEATURES PROVIDED | CASEHARDENED |
| NONDEFINITIVE SPEC/STD DATA | F TYPE |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |