| MATERIAL | STEEL COMP 8740 OR |
| STEEL COMP 4140 OR |
| STEEL COMP 4340 |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6322 ASSN STD 1ST MATERIAL RESPONSE OR |
| AMS 6382 ASSN STD 2ND MATERIAL RESPONSE OR |
| AMS 6415 ASSN STD 3RD MATERIAL RESPONSE |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| STYLE DESIGNATOR | RECESSED |
| LENGTH OF RECESSED PORTION OF SHANK | 0.280 INCHES NOMINAL |
| DIAMETER OF RECESSED PORTION OF SHANK | 0.221 INCHES MINIMUM AND |
| 0.231 INCHES MAXIMUM |
| OVERALL LENGTH | 1.535 INCHES MINIMUM AND |
| 1.555 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNJF 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 | 0.2810 TO 0.2825 INCHES STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.432 INCHES MINIMUM AND |
| 0.452 INCHES MAXIMUM NUT THREAD |
| 0.619 INCHES MINIMUM AND |
| 0.639 INCHES MAXIMUM STUD THREAD |
| SPECIAL FEATURES | UNTHREADED SECTION DIA. 0.3125 INCH |
| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND |
| 45.0 ROCKWELL C MAXIMUM |
| SURFACE FINISH | 32.0 MICROINCHES NUT THD |
| 32.0 MICROINCHES STUD THD |
| 63.0 MICROINCHES UNDERCUTS |