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Extension rod(ST58)

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     The ST58 drill pipe adopts a new thread design. The thread belongs to the shoulder drive system. The base shaft shoulder transmits energy together with the sleeve. It has excellent wear characteristics and connection quality. The thread is used for multi-tube drilling with high torque. Power rock drill for surface and tunnel drilling; the larger cross-sectional area of the rod can withstand shock waves from the piston for a longer period of time. This allows the life of the drill pipe and the shank to double. The harder drill pipe provides the best drilling pattern and higher bore penetration. Compared to other drill systems, the ST58 drill system uses the same rock drill but provides a larger bore range.

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