Hexagonal KellyLocation:Home >> Products >> Drill Pipe >>
Kellys, on the top of drill stem, shall be either Square or
Hexagonal. In rotary table drilling, while drilling Kelly fits
Kelly bushing and rotary table bushing and pass the torque of table
to drill pipe to lead the drill bit rotation; and bear the weight
of drill string. In the turbines and screw drilling, Kelly
withstands weight of drill string and anti-torque suspension.
We manufacture Square Kelly and Hexagonal Kelly according to API
SPEC7-1 and customer’s requirement, the materials used are forged
or rolled AISI 4142H-4145H, and applied heat treatment craftwork
such as quenching and tempering on the overall length. After this
heat treatment craftwork, the HB will reach 285-341, Charpy impact
≥54J, also the craftwork made can ensure eccentricity of bore reach
standard minimum wall thickness. The process for manufacturing
Kelly is according to API Specification.