| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.138 INCHES |
| THREAD QUANTITY PER INCH | 32 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.250 INCHES MINIMUM |
| FASTENER LENGTH | 0.343 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1010 OR |
| STEEL OR |
| STEEL COMP 1025 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-634 FED SPEC 1ST MATERIAL RESPONSE OR |
| QQ-S-698 1/2 HARD FED SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-7952 MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| HEAD STYLE | PAN |
| HEAD DIAMETER | 0.256 INCHES MINIMUM AND |
| 0.270 INCHES MAXIMUM |
| HEAD HEIGHT | 0.087 INCHES MINIMUM AND |
| 0.097 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| WASHER QUANTITY | 2 |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.250 INCHES NOMINAL |
| PRIMARY WASHER MATERIAL THICKNESS | 0.031 INCHES NOMINAL |
| SECONDARY WASHER RELATIONSHIP TO PRIMARY WASHER | NOT IDENTICAL |
| SECONDARY WASHER STYLE | FLAT |
| SECONDARY WASHER OUTSIDE DIAMETER | 0.253 INCHES MINIMUM AND |
| 0.263 INCHES MAXIMUM |
| SECONDARY WASHER MATERIAL THICKNESS | 0.013 INCHES MINIMUM AND |
| 0.019 INCHES MAXIMUM |