| CENTER HOLE SHAPE STYLE | ROUND |
| CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR |
| HOLE DIAMETER | 6.73 MILLIMETERS MINIMUM AND 6.86 MILLIMETERS MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | BS S154 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| PERIPHERAL SHAPE STYLE | ROUND |
| OUTSIDE LEFT CORNER CHAMFER ANGLE | 40.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM |
| OVERALL DIAMETER | 28.20 MILLIMETERS MINIMUM AND 28.70 MILLIMETERS MAXIMUM |
| SURFACE TREATMENT | NICKEL ALLOY OVERALL |
| THICKNESS | 2.29 MILLIMETERS MINIMUM AND 2.79 MILLIMETERS MAXIMUM |