... JIS,API,GB Specifications Material:J55,K55,N80,L80,P110, Thread:STC,LTC,BTC Standard:API 5ct ISO9001 Size:4-1/2--13-5/8 ... " Wall Thickness:5.21-13.06mm API 5CT Oil Casing Pipe Outer ... DiameterWall ThicknessNominal Linear MassGradeThreadLengthinmmmmkg/mlb/ft4 1/2"114.35.21-8 ...