| THREAD SERIES DESIGNATOR | UNRC |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| FASTENER LENGTH | 0.700 INCHES NOMINAL |
| MATERIAL | STEEL COMP 1050 OR |
| STEEL COMP 1055 OR |
| STEEL COMP 1069 OR |
| STEEL COMP 1070 PRIMARY WASHER |
| SURFACE TREATMENT | PHOSPHATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | GM 4435 M CODE A CAGEC 11862 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND |
| 40.0 ROCKWELL C MAXIMUM OVERALL |
| 42.0 ROCKWELL C MINIMUM AND |
| 48.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| 30.0 ROCKWELL C MINIMUM AND |
| 40.0 ROCKWELL C MAXIMUM FASTENER |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.172 INCHES MINIMUM AND |
| 0.190 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.367 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | SPRING TENSION |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.495 INCHES MINIMUM AND |
| 0.515 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.035 INCHES MINIMUM AND |
| 0.045 INCHES MAXIMUM |