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  • Product Rotary Kelly - China

    price: contact company for price

    Kelly is the drive part of whole drill string, it transmit

    the torsional energy from the rotary table to the bit in the

    bottom of the hole. TIANHE precision-machined Kelly is a

    heavy square or hexagonal steel bar supported by the swivel

    through the rotary table and connected to the first joint of

    drill pipe in the drill string.

    TIANHE Kelly has been approved by the NS-1 certification.

    Straightness is the key manufacturing process. Straightness

    is checked before, during and after each machining

    operation. Flats are precision-milled to API and NS-1

    specifications. All milling is performed on specially

    designed rigid Kelly mills. Each TIANHE Kelly is furnished

    with a pressed steel thread protectors.

    Features and Benefits

    Manufactured from AISI 4145H-modified, fully heat-treated

    alloy steel with a Brinell hardness range of 285-341 and a

    minimum average Charpy impact value of 40 ft-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


    Shipped in a protective steel-cased scabbard;

    When ordering Please specify:

    Kelly type (square or hexagonal);

    Nominal size and overall length;

    Upper and lower Connections.

    Specifications - Rotary Kelly




    Top Connection(LH)

    Bottom Connection


    Drive Section(in)

    Standard O.D.(in)

    Optional O.D.(in)

    Square O.D.(in)

    Hex. O.D.(in)





    2 1/2

    6 5/8REG 7 3/4

    4 1/2REG 5 3/4

    NC26 85.7

    1 1/4

    3 2/7


    NC31 4 1/8

    NC26 3 3/8

    1 3/4


    3 3/8

    3 1/2

    NC38 4 3/4

    NC31 4 1/8

    2 1/4

    4 1/2

    4 1/4

    NC46 6 1/4

    NC38 4 3/4

    2 4/5

    5 4/7

    4 4/5

    NC50 6 3/8

    5 1/4

    5 1/2FH 7

    NC46 6 1/4

    3 1/4



    NC56 7

    NC50 6 3/8

    5 1/2FH 7

    6 4/5

    NC56 7

    Company Contact:

    • Phone: 00862131150073

    • Address: No.2999 Xinyang Road,Fengxian District, Shanghai, China

    • Email: Email

    Published date: January 9, 2014 -

    • Business Description: Tianhe Oil Group is a comprehensive enterprise of equipment

      manufacturing and oilfield service providing. The company is specialized

      in innovation, manufacture and sales of drill and petroleum extraction

      tools, equipments and oil field services.

      Tianhe Oil Group is the council member of CPEIA (China Petroleum and Equipment Industry Association), rewarded as national level of Hi Tech enterprise. The company is a Chinese well known trademark enterprise. It has been certified to ISO, API, NS 1, and HSE management system.

      The company has developed a strong domestic sales network covering all oilfields of CNPC, SINOPEC and CNOOC. Currently, our products and equipments have been exported to 45 countries, overseas business has covered 80% of our company sales.

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