KELLY BUSHINGS
KELLY BUSHINGS
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 the bushing. In drilling operation, the Kelly shall keep sliding 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.
TECHNICAL SPECIFICATIONS
|
MODEL |
TYPE |
DRIVE MODE |
SIZE RANGE OF KELLY (in.) |
|
|
SQUARE |
HEXAGON |
|||
|
4KRBM |
Light-duty |
Square |
2 ½ ~ 4 ¼ |
3 ~ 4 ¼ |
|
4KRVS |
Medium-duty |
Square |
2 ½ ~ 5 ¼ |
3 ~ 4 ¼ |
|
17-MDP |
Pin |
2 ½ ~ 4 ¼ |
3 ~ 4 ¼ |
|
|
20-MDP |
Pin |
2 ½ ~ 4 ¼ |
3 ~ 4 ¼ |
|
|
HDS |
Heavy-duty |
Square |
3 ~ 6 |
3 ~ 6 |
|
20-HDP |
Pin |
3 ~ 6 |
3 ~ 6 |
|
|
27-HDP |
Pin |
3 ~ 6 |
3 ~ 6 |
|