| FASTENER LENGTH | 0.750 INCHES NOMINAL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM PRIMARY WASHER AND 53.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD HEIGHT | 0.155 INCHES MINIMUM AND 0.170 INCHES MAXIMUM |
| HEAD DIAMETER | 0.389 INCHES MINIMUM AND 0.414 INCHES MAXIMUM |
| HEAD STYLE | FILLISTER |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| MATERIAL | STEEL COMP 1010 FASTENER OR STEEL COMP 1011 FASTENER OR STEEL COMP 1013 FASTENER OR STEEL COMP 1015 FASTENER OR STEEL COMP 1016 FASTENER OR STEEL COMP 1017 FASTENER OR STEEL COMP 1018 FASTENER OR STEEL COMP 1019 FASTENER OR STEEL COMP 1020 FASTENER |
| PRIMARY WASHER MATERIAL THICKNESS | 0.063 INCHES MINIMUM |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.384 INCHES MINIMUM AND 0.400 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.624 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNC |
| WASHER QUANTITY | 1 |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OVERALL OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL OR ZINC OVERALL |