| 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 |