| CONCENTRIC HOLE DEPTH | 0.172 INCHES NOMINAL |
| CONCENTRIC HOLE DIAMETER | 0.188 INCHES NOMINAL |
| EXTENDED WASHER DIAMETER | 0.650 INCHES MINIMUM AND 0.660 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM |
| FASTENER LENGTH | 0.900 INCHES NOMINAL |
| HARDNESS RATING | 25.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.250 INCHES NOMINAL |
| HEAD STYLE | HEXAGON EXTENDED WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MINIMUM YIELD STRENGTH | 130000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| NONSTANDARD THREAD PITCH DIAMETER | +0.2880 TO 0.2899 INCHES |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| WIDTH BETWEEN FLATS | 0.431 INCHES MINIMUM AND 0.438 INCHES MAXIMUM |
| STYLE DESIGNATOR | CONCENTRIC HOLE UNTHREADED |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.750 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES DESIGNATOR | UNF |