| MATERIAL | STEEL COMP 8640 OR |
| STEEL COMP 8740 OR |
| STEEL COMP 4140 |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A322 ASSN STD 1ST MATERIAL RESPONSE OR |
| ASTM A331 ASSN STD 1ST MATERIAL RESPONSE OR |
| ASTM A322 ASSN STD 2ND MATERIAL RESPONSE OR |
| ASTM A331 ASSN STD 2ND MATERIAL RESPONSE OR |
| SAE ASSN STD 3RD MATERIAL RESPONSE OR |
| AISI ASSN STD 3RD MATERIAL RESPONSE |
| SURFACE TREATMENT | CADMIUM OVERALL |
| OVERALL LENGTH | 1.560 INCHES NOMINAL |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |
| UNS STUD THREAD |
| NOMINAL THREAD SIZE | 0.312 INCHES NUT THREAD |
| 0.312 INCHES STUD THREAD |
| THREAD CLASS | 3A NUT THREAD |
| THREAD QUANTITY PER INCH | 24 NUT THREAD |
| 18 STUD THREAD |
| THREAD PITCH DIAMETERS | 0.2894 TO 0.2909 INCHES STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.690 INCHES MINIMUM NUT THREAD |
| 0.680 INCHES MINIMUM STUD THREAD |
| HARDNESS RATING | 28.0 ROCKWELL C MINIMUM AND |
| 34.0 ROCKWELL C MAXIMUM |