1.Size:1.9"~ 4-1/2"
  End type:NUE,EUE
  Nominal Weight:4.09kg/m~18.75kg/m
  O.D.:48.26mm~114.3mm
  Steel Grade:J55/K55/N80/L80/P110
  Wall thickness:3.18mm~16mm
  Certifate: API SPEC 5CT
2.Quality control
  We have implemented stringent quality control tests
system to inspect raw materials and examine products in
every stage of the production :
  *Size and surface inspection
  *Non-destructive test
  *Thread inspection
  *Hydrostatic test
  *Drifting test
  *Physical and chemical analysis
  *Hardness and pressure test