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1,high quality and competitive price, 2,durable steel material for longtime use, 3,applied to the hard and soft layer - details see: https://www.machineto.com/best-quality-kelly-bar-10113098

Full interlocking pressurizing kelly bar is also known as concave-convex Kai-type pressurizing kelly bar.It is used for IMT and MAIT rotary drilling rig originally. It is characterized by external keys which composed by three subcomponent keys, and each external key are composed of fabric by the convex and concave tine. Driving internal keys are also composed of three sub-component keys.and each internal keys are also distributed by the concave and convex tine. The internal keys and external keys with driving force can be formed lock anywhere and anytime. During the drilling process, the driving force head send pressure directly to drilling head. Currently, the transmission pressure of this drill pipe is the best formation and permafrost; every site of the drill pipe can be formed the pressure point in the course of drilling, avoiding the drill in a part of the pipe wall caused by the pipe-sticking, at the same time, the convex and concave tine distributed in the driving internal key and external key have a good meshing. the pressurized part contains multi-point pressure ,which makes the kelly bar more efficiently. We can also provide kelly bar for BAUER, MAIT, IMT, SOILMEC, CASAGRANDE and other foreign brands rotary drilling rig.

Full interlocking pressurizing kelly bar
Type	O.Dia.(MM)	Section	Depth(m)	Torque(KN.M)
340-3x13	340	3	36	120
356-3x13	356	3	36	120
377-4x14	377	4	52	150
406-4x14	406	4	52	200
406-4x14	406	4	52	220
445-4x15	445	4	56	250
445-3x15 (Reinforced)	445	3	42	250
470-4x15	470	4	56	250
508-4x15	508	4	56	250
508-5x15	508	5	70	280