... parts in stock 2. Slewing ring for tower crane MC310, F0/23B, H3/30 etc The slewing ring we supply is for ... ; ISO9000:2000 and SGS certificationGOOD PAINTINGUSED FOR: QTZ80, T5020,T6018,F0/23B,T6015,H25/14 L44A1 1.6m*1.6m*3m angle ... 12 bolts .(common manufacturers adopts 8.8 grade). Tower crane F0/23B slewing ring , spare parts of tower crane