| MATERIAL | STEEL COMP 8640 |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS A322 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS A331 ASSN STD SINGLE MATERIAL RESPONSE |
| SURFACE TREATMENT | PHOSPHATE MANGANESE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-16232,TY 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| OVERALL LENGTH | 2.438 INCHES NOMINAL |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |
| UNS STUD THREAD |
| NOMINAL THREAD SIZE | 0.438 INCHES NUT THREAD |
| 0.438 INCHES STUD THREAD |
| THREAD CLASS | 3A NUT THREAD |
| THREAD QUANTITY PER INCH | 20 NUT THREAD |
| 14 STUD THREAD |
| THREAD PITCH DIAMETERS | 0.3949 TO 0.3969 INCHES STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 1.125 INCHES MINIMUM NUT THREAD |
| 0.750 INCHES MINIMUM STUD THREAD |
| HARDNESS RATING | 27.0 ROCKWELL C MINIMUM AND |
| 32.0 ROCKWELL C MAXIMUM |