| GENERAL CHARACTERISTICS ITEM DESCRIPTION | MAGNESIUM ALLOY QQ-M-56 COMP AZ63-HTA OR COMP AZ92-HTA,SURFACE TREATMENT DICHROMATE MIL-M-3171 TYPE 3,DIM.,6.250 IN. N/M FLANGE OD,0.125 IN. NOM FLANGE W,0.6875 IN. NOM O/A W,6-16 N CLASS 3 EXTERNAL OD THREADS BY 0.406 IN. LG,ONE CENTRAL EXTERNAL EXTENSION 0.880 IN. DIA BY 0.500 IN. LG W/0.625 IN. DISTANCE ACROSS WRENCHING FLATS,FIVEINTERNAL WEBS 0.180 IN. THK,ITEM USED ON MAIN ROTOR HUB |