| 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 HEIGHT | 0.182 INCHES MINIMUM AND 0.192 INCHES MAXIMUM |
| HEAD DIAMETER | 0.688 INCHES MINIMUM AND 0.750 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4140 OVERALL |
| MINIMUM TENSILE STRENGTH | 120000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| RIB LENGTH | 0.287 INCHES MINIMUM AND 0.329 INCHES MAXIMUM |
| RIB MAJOR DIAMETER | 0.405 INCHES MINIMUM AND 0.410 INCHES MAXIMUM |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OR ZINC AND CHROMATE OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.859 INCHES MINIMUM AND 0.891 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES DESIGNATOR | UNF |