1.Name: casing couplings 2.Std Ref: API 5CT 5B 3.Grade: J55,K55,N80,L80,C90 4.Size:from 4-1/2" to 6-5/8 1.Name: API TC-06casing couplings2.Std Ref: API 5CT 5B3.Grade: J55,K55,N80,L80,C90NamesizeType of TreadO.D*L(mm)Weight(kg)casing Couplings4-1/2"STC127.00*158.755.234-1/2"LTC127.00*177.804.154-1/2"BTC127.00*225.424.555"STC141.30*165.104.665"LTC141.30*196.855.755"BTC141.30*231.785,855-1/2"STC153. ...