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We are a chinese manufacturer and supplier of drilling tools， established since 1983. we have dedicated ourselves since to supply the drilling industry with the best products. Our products, such as bits, Drill pipe, drill collar and other drilling.....

Integral heavy weight drill pipes are manufactured from AISI 4142H-4145H modified drill collar material according to SY/T 5146-1997, Specification: 5"OD*3"ID NC50 3 1/2"OD*2 1/16"ID If you are interested, please don't hesitate to contact me......

1. Material: Brass; Stainless steel; Carbonized steel; Zinc alloy 2. Surface finished: Chromeplate; Galvanization; Copperize; Nickle plated 3. Our factory has equipments with CNC lathes, millings, drillings, planning and grinding machines. We.....

The products’ minimal tolerance of wall thickness can be controlled within ±5％，much smaller than general products’ tolerance of ±12％, and the tolerance of outside diameter can be controlled within ± 0.5-0.8%.