Oilfield pipes

Tubing: Tubing used in oil wells for oil, gas, water injection and acid fracturing.
Casing: Tubing that is lowered from the surface of the earth into a drilled borehole as a liner to prevent the wall from collapsing.
Drill pipe: Pipe used for drilling boreholes.
Line pipe: Pipe used to transport oil or gas.
Circlips: Cylinders used to connect two threaded pipes with internal threads.
Coupling material: Pipe used for manufacturing couplings.
API Threads: Pipe threads specified by API 5B standard, including oil pipe round threads, casing short round threads, casing long round threads, casing offset trapezoidal threads, line pipe threads and so on.
Special buckles: non-API threads with special sealing performance, connecting performance and other properties of the buckle type