| WIDTH BETWEEN FLATS | 0.554 INCHES MINIMUM AND 0.562 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | BS 3382 PART 2 NATIONAL STD/SPEC 1ST TREATMENT RESPONSE AND BSI BS 6338 CLASS 2C NATIONAL STD/SPEC 2ND TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC AND PASSIVATE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.000 INCHES NOMINAL |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD PITCH IN MILLIMETERS | 24.0 |
| FASTENER LENGTH | 3.000 INCHES NOMINAL AND 2.906 INCHES MINIMUM AND 3.000 INCHES MAXIMUM |
| FEATURES PROVIDED | FINISHED HEAD |
| HARDNESS RATING | 223.0 BRINELL STANDARD MINIMUM AND 310.0 BRINELL STANDARD MAXIMUM OVERALL |
| HEAD HEIGHT | 0.233 INCHES MINIMUM AND 0.243 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL | STEEL OVERALL |
| MINIMUM TENSILE STRENGTH | 112000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |