Kelly Bushings - 4KRBM, 4KRVS, HDP, MSPC
The Kelly Bushings are designed to hold the Kelly and match with the Master Bushing, to drive the Kelly stem rotate by the four rollers in bushing. In drilling operation, the Kelly shall keeping slide downward with the increase of drilling depth.
The rollers can reduce friction to the Kelly and extending its service life. For different shape of the Kelly stem (square or hexagonal), different rollers are available.
| Model | GBX-6 | GBX-6Z |
| Kelly Size mm (in) | / | 89-152 (31/2 - 6) |
|
Max .Torque
kN.m (lb.ft) |
17 (12,296) | 27 (19,847) |
|
Overall Dimension
mm (in) |
630 × 750 (2413/16× 299/16) | 622 × 622 × 750 (24 × 24 ×291/2) |
| Weight kg (lbs) | 720 (1,584) | 730 (1,606) |
| Model | Type | Drive | Fitting Kelly Size | |
| Square (in) | Hexagonal (in) | |||
| HDS | Heavy |
Square | 21/2 - 6 | 3 - 6 |
| 27-HDP | Pinned Shaft | 3 - 6 | ||
| 20-HDP | ||||
| RTM4 | Medium |
Square | 21/2 - 51/4 | 3 - 41/4 |
| 20-MDP | Pinned Shaft | 21/2 - 41/4 |
||
| 17-MDP | ||||
| RTS4 | Light | Square | ||
Specifications:
