Normally it is of 5 elements, in which the inner element is frictional characterized and the others are interlocking. It is mainly used in the project of deep drilling depth (out of the nominal drilling depth of interlocking Kelly bar) and hard soil condition (the efficiency is very low by using frictional Kelly bar).
Specifications
| No. | Diammeter of the first section | Sections | Key Pressure Type | Length of per section (m) | Drilling Depth(m) | Torque(KN.M) | ||
| 1 | Φ440 | 3 | 4 | Interlocking | 9-15 | 24-55 | 220-260 | |
| 2 | Φ470（482） | 3 | 4 | Interlocking | 9-15 | 24-65 | 230-280 | |
| 3 | Φ508 | 3 | 4 | Interlocking | 9-15 | 24-70 | 260-360 | |
| 4 | Φ530（540） | 3 | 4 | 5 | Interlocking | 9-15 | 24-85 | 360-420 |
| 5 | Φ575（580） | 3 | 4 | 5 | Interlocking | 9-15 | 24-85 | 420-460 |
| 6 | Φ630 | 3 | 4 | 5 | Interlocking | 9-15 | 24-92 | 460-550 |
Warranty :One year or 2000 working hours
*Other size can be tailor-made as requirement
Warranty
One year or 2000 working hours
Spare Parts
Kelly bar spring, Swivel
Packaging & Shipping
Package Options: Standard
Packaging & Shipping: Pallet with plastic film
Packaging & Shipping: Pallet with plastic film
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