| FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC | |
| NOT RATED | |
| 2.750 INCHES NOMINAL | |
| 4.312 INCHES NOMINAL | |
| 0.500 INCHES | |
| 2.687 INCHES NOMINAL | |
| HUB DRILLED AND TAPPED | |
| RIGID METALLIC THICKWALL | |
| FDC TYPE FORM 1 | |
| THREADED FASTENER | |
| 4 | |
| RECTANGULAR | |
| 1 | |
| RIDGED | |
| OPEN CENTER | |
| 1 | |
| BLANK | |
| IRON,CAST | |
| RECTANGULAR 2 ENTRANCES | |
| ANY ACCEPTABLE | |
| 2 TYPE AND C STYLE AND 8 DESIGN AND 1 FORM |
