| FASTENER LENGTH | 1.120 INCHES NOMINAL |
| GROOVE DIAMETER | 0.191 INCHES MINIMUM AND 0.201 INCHES MAXIMUM |
| HARDNESS RATING | 33.0 ROCKWELL C NOMINAL OVERALL |
| HEAD DIAMETER | 0.390 INCHES MINIMUM AND 0.400 INCHES MAXIMUM |
| HEAD HEIGHT | 0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM |
| HEAD STYLE | PAN |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | AISI 4340 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| WIDTH ACROSS FLATS | 0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 2A |
| THREAD LENGTH | 0.260 INCHES MAXIMUM |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNF |