crown block 1.Forged with high strength steel. 2.Conform to API ... running out of sheaves. Each crown block conforms to API 4F & API 8C mandates. Model TC135TC225TC315TC450Max.hook loadKN(lbf)1,305(303 ... ) 2,500*2,050*1,920(98*80*76)3,200*3,347*3,640(126*131*99)3,295*2 ... ,700)7,400(16,300)9,500(20,940) crown block