We are a professional manufacturer of rock drilling tools in China. Our main products include rock drill, TBM cutter, roller cutter bits, DTH hammer, DTH bit, button bit, retract button bit, cross bit, chisel bit, drill rod, drill tube, shank adaptor, coupling sleeve, pilot adaptor, overburden drilling equipment, cutting tools which are used for mining, quarrying, tunneling, water well drilling, mineral exploration, geological prospecting, civil engineering and construction. Etc.

Extension rods are made by hollow drill steels; there are two shapes of extension rods, round type and hexagonal type. This hollow hole are usually named flushing hole, used for transmitting water or air during drilling,And the threads can be used for connecting couplings, shanks, couplings or bits.

Usually for extension rods, there are R22, R25, R28, R32, R38, T38, T45 ,T51,ST58, T60 threads, and different lengths of rods are available from 600mm to 6400mm usually.

(1)Thread: R22, R25, R28, R32, R38, T38, T45, T51,

(2)Rod size : hex.22mm, hex.25mm,hex.28mm, hex.32mm, hex.35mm, dia.39mm, dia.46mm. dia.52mm

(3)Length: 0.4m-6m

(4)Package: in wooden case or in bundles

(5)Supply ability:10000pcs/month

(6)Payment terms:T/T or L/C