| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL |
| FASTENER LENGTH | 0.635 INCHES MINIMUM AND 0.655 INCHES MAXIMUM |
| HEAD DIAMETER | 0.5018 INCHES MINIMUM AND 0.5066 INCHES MAXIMUM |
| HEAD STYLE | FLAT COUNTERSUNK |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 4130 OVERALL |
| PROPRIETARY CHARACTERISTICS | PACS |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.520 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNJF |