| CONCENTRIC HOLE DEPTH | 1.250 INCHES NOMINAL |
| CONCENTRIC HOLE DIAMETER | 0.312 INCHES NOMINAL |
| FASTENER LENGTH | 6.062 INCHES NOMINAL |
| HARDNESS RATING | 22.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.625 INCHES NOMINAL |
| HEAD STYLE | HEXAGON |
| INTERNAL THREAD CLASS | 2B CONCENTRIC HOLE |
| INTERNAL THREAD DIRECTION | RIGHT-HAND COUNTERBORE |
| INTERNAL THREAD LENGTH | 0.875 INCHES MINIMUM COUNTERBORE |
| MATERIAL | STEEL COMP 1035 OR STEEL COMP 1045 OVERALL |
| NOMINAL THREAD SIZE | 0.375 INCHES COUNTERBORE |
| NOMINAL THREAD DIAMETER | 0.750 INCHES |
| SHOULDER DIAMETER | 0.990 INCHES MINIMUM AND 1.000 INCHES MAXIMUM |
| SHOULDER LENGTH | 4.795 INCHES MINIMUM AND 4.830 INCHES MAXIMUM |
| SPECIAL FEATURES | SHOULDER CHAMFERED 0.219 IN. LG ON END TO 0.875 IN. DIA |
| WIDTH BETWEEN FLATS | 1.469 INCHES MINIMUM AND 1.500 INCHES MAXIMUM |
| STYLE DESIGNATOR | COUNTERBORE THREADED |
| 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 CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.028 INCHES MINIMUM AND 1.095 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD SERIES | UNC COUNTERBORE |
| THREAD QUANTITY PER INCH | 16 |
| THREADS PER INCH | 16 COUNTERBORE |