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kelly is the driving part of whole drill string ,it transmit the torsional energy from the rotary table to the bit in the bottom of the hole. Tianhe precison-machined kelly is a heavy square or hexagonal steel bar supported by the swivel through the rotary table and connected to the first jont of drill pope in the drill string.
Tianhe kelly has been approved by the NS-1 certification.
products features and benifits:
Manufactured from AISI 4145H-modified,fully heart-treated alloy steel with a brinell hardness range of 285-341 and a minimum average charply impact value of 40ft-lbs;
ends and drive sections, IDs and connections machined and inspected to API and NS-1 specifications.
kelly bars ultrasonically inspected over full length and section;
shipped in a protective steel-cased scabbard.
Suggest contact with us for detail size and requirement.
rotary kelly
