... manufacturer which produces the petroleum machinery such as sucker rod, drill collar, drill pipe and oil tube, etc. It has over 300 ... , License Number of API Certificate : sucker rod 11B-0081, drill collar 7-1-0552 , drill pipe 5D-0104,oil tube 5CT-0967 ... .Drill pipe specification OD Wall thickness pipe body length(mm)GradeUpsetting ...