| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.080 INCHES MINIMUM AND 0.100 INCHES MAXIMUM |
| FASTENER LENGTH | 0.690 INCHES MINIMUM AND 0.710 INCHES MAXIMUM |
| FIRST DIAMETER FROM HEAD | 0.178 INCHES MINIMUM AND 0.182 INCHES MAXIMUM |
| HARDNESS RATING | 23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.306 INCHES MINIMUM AND 0.310 INCHES MAXIMUM |
| HEAD HEIGHT | 0.300 INCHES MINIMUM AND 0.320 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-764,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 416 OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SPECIAL FEATURES | 0.130 IN. MIN 0.135 IN. MAX DISTANCE FROM CTR 0F HEAD TO CTR LINE OF SHANK |
| WIDTH ACROSS FLATS | 0.188 INCHES MINIMUM AND 0.190 INCHES MAXIMUM |
| SURFACE FINISH | 63.0 MICROINCHES SIDES OF HEAD |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-13924,CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | OXIDE OVERALL |
| THREAD CLASS | 2A |
| THREAD LENGTH | 0.270 INCHES MINIMUM AND 0.330 INCHES MAXIMUM |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNF |