| FASTENER LENGTH | 15.50 MILLIMETERS MINIMUM AND 16.00 MILLIMETERS MAXIMUM |
| HEAD HEIGHT | 3.56 MILLIMETERS MINIMUM AND 3.81 MILLIMETERS MAXIMUM |
| HEAD STYLE | HEXAGON |
| HOLE CONFIGURATION STYLE | HEXAGON CORNERS |
| HOLE DIAMETER | 1.46 MILLIMETERS MINIMUM AND 1.72 MILLIMETERS MAXIMUM |
| HOLE QUANTITY | 2 |
| HOLE TYPE | DRILLED |
| MATERIAL DOCUMENT AND CLASSIFICATION | BS S154 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.2500 INCHES |
| SPECIAL FEATURES | ZINC-NICKEL ALLOY OVERALL |
| WIDTH BETWEEN FLATS | 10.95 MILLIMETERS MINIMUM AND 11.13 MILLIMETERS MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNF |