| FASTENER LENGTH | 0.500 INCHES NOMINAL |
| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD DIAMETER | 0.217 INCHES MINIMUM AND 0.236 INCHES MAXIMUM |
| HEAD HEIGHT | 0.083 INCHES MINIMUM AND 0.095 INCHES MAXIMUM |
| HEAD STYLE | ROUND |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| NOMINAL THREAD DIAMETER | 0.125 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.014 INCHES MINIMUM AND 0.020 INCHES MAXIMUM |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| WASHER QUANTITY | 1 |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OR ZINC OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.404 INCHES MINIMUM AND 0.486 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 44 |