... industry standard SY/T5527. The sheave and bearing are interchangeable for those of mated crown blockModelYC225Max. hook load2250 (500000)kN /(1bs ... same as chinese NOV ,our prodcts : rotary table ,hook, travelling block,crown block,swivel ( same as Chinese NOV company ) ,our mud pump ... !welcome stronger sales engineer to work with us ~! YC225,travelling block for drilling rig,tiger brand,in stock