| APERTURE DIAMETER | 18.687 INCHES NOMINAL18.687 INCHES NOMINAL |
| CROSS-SECTIONAL SHAPE STYLE | METAL WINDING W/ SOFT FILLER AND OUTER RINGMETAL WINDING W/ SOFT FILLER AND OUTER RING |
| CROSS-SECTIONAL THICKNESS | 0.175 INCHES MINIMUM0.175 INCHES MINIMUM |
| GAGE RING OUTSIDE DIAMETER | 21.625 INCHES NOMINAL21.625 INCHES NOMINAL |
| GAGE RING THICKNESS | 0.093 INCHES MINIMUM0.093 INCHES MINIMUM |
| OUTSIDE DIAMETER | 20.750 INCHES NOMINAL20.750 INCHES NOMINAL |
| MATERIAL | GRAPHITE OR NICKEL ALLOY 600 CORE |
| MATERIAL | STEEL OUTER RING |
| STYLE DESIGNATOR | CIRCULAR |