| STYLE DESIGNATOR | STEPPED |
| THREAD CLASS | 3A NUT THREAD A |
| THREAD CLASS | 3A NUT THREAD B |
| THREAD LENGTH | 0.550 INCHES NOMINAL NUT THREAD A |
| THREAD LENGTH | 0.562 INCHES NOMINAL NUT THREAD B |
| THREAD QUANTITY PER INCH | 18 NUT THREAD A |
| THREAD QUANTITY PER INCH | 28 NUT THREAD B |
| THREAD SERIES DESIGNATOR | UNJF NUT THREAD A |
| THREAD SERIES DESIGNATOR | UNJS NUT THREAD B |
| MATERIAL | STEEL |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD SIZE | 0.250 INCHES NUT THREAD A |
| NOMINAL THREAD SIZE | 0.313 INCHES NUT THREAD B |
| OVERALL LENGTH | 1.500 INCHES NOMINAL |
| SHANK DIAMETER | 0.221 INCHES MINIMUM AND 0.231 INCHES MAXIMUM |
| SPECIAL FEATURES | OVERSIZE ID +.006,END B THRU HOLE .065/.077 COUNTERSUNK |