| FIRST END STYLE | SQUARE |
| FIRST STEP DIAMETER | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM |
| FIRST STEP LENGTH | 0.640 INCHES NOMINAL |
| HEAD STYLE | KNURLED NO. 1 |
| HEIGHT | 0.575 INCHES NOMINAL |
| MATERIAL DOCUMENT AND CLASSIFICATION | BS 970 PART 1 GRADE 070-20 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| III PART NAME ASSIGNED BY CONTROLLING AGENCY | KNOB |
| PIN HEAD DIAMETER | 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM |
| SECOND STEP DIAMETER | 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM |
| SECOND STEP LENGTH | 0.150 INCHES MINIMUM AND 0.170 INCHES MAXIMUM |
| STYLE DESIGNATOR | SHOULDER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | DEF STAN 03-11 CLASS II NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE OVERALL |
| UNDER HEAD LENGTH | 0.790 INCHES MINIMUM AND 0.810 INCHES MAXIMUM |