... 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 ... N80/P110/K55/L80LTC/STC/BTCR1/R2/R36 5/8"168.287.32-12.0629.76-35. ...