1.taper drill rod and integral drill rod 2.durable steel material for longtime use 3.high quality and reasonable price

Detailed Product Description

1,high quality and competitive price 2,durable steel material for longtime use 3,applied to the hard and soft layer The external key of the mechanical interlocking kelly bar usually hao three or six keys. There are three large groups or N groups pressure concave parts in the external key, three or six wear-resistant keys in the internal keys. The length of the bar is less than the length of large concave tine of the external key. When the driving force rotates, the internal key of the driving set or the internal key of kelly bar rotate to the large concave tine of the external key, and formed a Kai-type pressuring point. Driving force head send pressure to the drill head, then forms a mechanical locking. A full rotary drill head must be rotary in the opposite direction to unlock, then smoothing reversal upgrade. This kelly bar is used for hard or soft layer to drill, which hao better transmission pressure. This kelly bar need to move driving force head up and down. When drilling in hard layer,. It transfer pressure after find the large concave meshing tine in the external. At resent,the mechanical pressuring kelly bar is usually combined with three sections, four sections and five sections, with the drilling depth in the range of 36-80 meters.

 

 

Interlocking Kelly Bar
Type	O.Dia.(MM)	Section	Depth(m)	Torque(KN.M)
DZ12 340-3x13	340	3	36	120
DZ12 356-3x13	356	3	36	120
DZ15 377-4x14	377	4	52	150
DZ20 406-4x14	406	4	52	200
DZ22 406-4x14	406	4	52	220
DZ25 445-4x15	445	4	56	250
DZ25 445-3x15 (Reinforced)	445	3	42	250
DZ25 470-4x15	470	4	56	250
DZ25 508-4x15	508	4	56	250
DZ28 508-5x15	508	5	70	280

 

International new 508 Drill Rod