| MATERIAL | IRON ALLOY 660 |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE |
| SURFACE TREATMENT | SILVER OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-S-365 GRADE B FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| STYLE DESIGNATOR | RECESSED AND STEPPED |
| PLAIN SHANK DIAMETER | 0.236 INCHES MINIMUM AND |
| 0.241 INCHES MAXIMUM |
| LENGTH OF RECESSED PORTION OF SHANK | 0.562 INCHES NOMINAL |
| DIAMETER OF RECESSED PORTION OF SHANK | 0.190 INCHES NOMINAL |
| OVERALL LENGTH | 1.341 INCHES NOMINAL |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |
| UNC STUD THREAD |
| NOMINAL THREAD SIZE | 0.190 INCHES NUT THREAD |
| 0.312 INCHES STUD THREAD |
| THREAD CLASS | 3A NUT THREAD |
| 3A STUD THREAD |
| THREAD QUANTITY PER INCH | 32 NUT THREAD |
| 18 STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.500 INCHES MINIMUM NUT THREAD |
| 0.225 INCHES MINIMUM AND |
| 0.248 INCHES MAXIMUM STUD THREAD |
| SPECIAL FEATURES | OPTIONAL HARDNESS FOR AMS 5737 28-40 RC |
| HARDNESS RATING | 24.0 ROCKWELL C MINIMUM AND |
| 37.0 ROCKWELL C MAXIMUM |
| PRECIOUS MATERIAL | SILVER |
| PRECIOUS MATERIAL AND LOCATION | OVERALL SILVER |