| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.062 INCHES NOMINAL |
| FASTENER LENGTH | 1.188 INCHES NOMINAL |
| HARDNESS RATING | 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.188 INCHES NOMINAL |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 1330H OR STEEL COMP 4130H OR STEEL COMP 5120H OVERALL |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| RIB LENGTH | 0.156 INCHES NOMINAL |
| RIB MAJOR DIAMETER | 0.417 INCHES MINIMUM AND 0.425 INCHES MAXIMUM |
| SHOULDER DIAMETER | 0.396 INCHES MINIMUM AND 0.400 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.219 INCHES NOMINAL FIRST SHOULDER |
| SHOULDER SHAPE | RIBBED FIRST SHOULDER |
| SPECIAL FEATURES | SHOULDER TAPERED 0.188 IN. LG TO NOMINAL DIA OF THREADS |
| WIDTH BETWEEN FLATS | 0.562 INCHES NOMINAL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.625 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES DESIGNATOR | UNF |