| FASTENER LENGTH | 1.375 INCHES MINIMUM AND 1.391 INCHES MAXIMUM |
| HARDNESS RATING | 28.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.625 INCHES NOMINAL |
| HEAD HEIGHT | 0.182 INCHES MINIMUM AND 0.192 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4140 OVERALL |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| RIB LENGTH | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM |
| RIB MAJOR DIAMETER | 0.429 INCHES MINIMUM AND 0.434 INCHES MAXIMUM |
| SHOULDER DIAMETER | 0.429 INCHES MINIMUM AND 0.434 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| SHOULDER LENGTH | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM FIRST SHOULDER |
| 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 | 0.875 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES DESIGNATOR | UNF |