... special requirements from Customers.1) Chain wheel, gear wheel, sheave, idler wheel, platen, winding drum, helm seat etc. for deck machining ... petrochemical industry working.(5) Gear, Bull Gear, axial seat, big shaft, block, module etc.(6) Fire grate car, carrier wheel, driving ... NK,DNV,BV,ABS,CCS,GL,Germany classification society attestation. idler gear