| ATTACHMENT METHOD | SETSCREWS |
| COUNTERBORE DEPTH | 0.140 INCHES MINIMUM AND 0.180 INCHES MAXIMUM |
| COUNTERBORE DIAMETER | 0.360 INCHES MINIMUM AND 0.400 INCHES MAXIMUM |
| DISTANCE FROM HOLE CENTER TO KNOB/SKIRT BASE | 0.290 INCHES MINIMUM AND 0.330 INCHES MAXIMUM |
| GRIPPING SURFACE CONDITION | SMOOTH |
| NOMINAL THREAD SIZE | 0.164 INCHES SCREW HOLE |
| OUTSIDE DIAMETER | 0.860 INCHES MINIMUM AND 0.900 INCHES MAXIMUM |
| OVERALL DEPTH | 0.600 INCHES MINIMUM AND 0.640 INCHES MAXIMUM |
| OVERALL THICKNESS | 0.730 INCHES MINIMUM AND 0.770 INCHES MAXIMUM |
| REFERENCE MARKING | INDICATOR LINE |
| SETSCREW HOLE QUANTITY | 2 |
| SHAFT ACCOMMODATION STYLE | COUNTERBORED |
| SHANK DIAMETER | 0.860 INCHES MINIMUM AND 0.900 INCHES MAXIMUM |
| SHANK STYLE | STRAIGHT |
| SHANK LENGTH | 0.100 INCHES MINIMUM AND 0.140 INCHES MAXIMUM |
| SKIRT DESIGN | NONDETACHABLE |
| SKIRT OUTSIDE DIAMETER | 0.860 INCHES MINIMUM AND 0.900 INCHES MAXIMUM |
| SKIRT STYLE | STRAIGHT |
| SPECIAL FEATURES | MOD S/A MS21385-04GGW |
| STYLE DESIGNATOR | SQUARE OR RECTANGULAR WITH BAR FACE |
| THREAD QUANTITY PER INCH | 32 SCREW HOLE |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) SCREW HOLE |