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rotary piling rig kelly bar

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Product Introduction

Frictional kelly bar doesn't need to unlock the joint of its inner and outer lining so that it is convenient and fast to lift the bar. Non-stair key, friction transmission and the outside key are made by highly wear-resisting tempering steel. Friction Kelly Bar is applicable for layer of soft ground and mud, (mud) sand, gravel. Interlocking kelly bar is of great pressure transmission and good anti-contortion perfomance. There are 3 rigid parts between drilling pipes to transfer greater pressure

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