| FASTENER LENGTH | 1.250 INCHES NOMINAL |
| HARDNESS RATING | 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.218 INCHES MINIMUM AND 0.226 INCHES MAXIMUM |
| HEAD HEIGHT | 0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| MINIMUM YIELD STRENGTH | 155000 POUNDS PER SQUARE INCH |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.138 INCHES |
| NONDEFINITIVE SPEC/STD DATA | 6 TYPE |
| WIDTH ACROSS FLATS | 0.109 INCHES NOMINAL |
| SURFACE FINISH | 32.0 MICROINCHES THREADS |
| SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| SURFACE FINISH | 63.0 MICROINCHES GRIP |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 3A |
| THREAD LENGTH | 0.813 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNC |
| THREAD QUANTITY PER INCH | 32 |