| FASTENER LENGTH | 0.625 INCHES NOMINAL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD DIAMETER | 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM |
| HEAD HEIGHT | 0.102 INCHES MINIMUM AND 0.113 INCHES MAXIMUM |
| HEAD STYLE | FILLISTER |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| NOMINAL THREAD DIAMETER | 0.164 INCHES |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER MATERIAL THICKNESS | 0.031 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.243 INCHES MINIMUM AND 0.257 INCHES MAXIMUM |
| WASHER QUANTITY | 1 |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 1,CLASS 3 FED SPEC 1ST TREATMENT RESPONSE AND QQ-Z-325,TYPE 2,CLASS 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.563 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 32 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |