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API-1 Square and Hexagonal Kelly Manufacturing by China Suppliers | High-Quality Drilling Factory
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API-1 Square KellyHexagonal Kelly Manufacturing (1).jpg
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API-1 Square and Hexagonal Kelly Manufacturing by China Suppliers | High-Quality Drilling Factory

Kellys are essential power transmission tools in drilling rigs, efficiently transferring rotational force from the rotary table to the drill string. Our kellys come in two configurations: square and hexagonal, manufactured in strict accordance with API Spec 7 standards. As a leading supplier in China, our factory ensures that all connections are precision-machined and undergo rigorous quality assurance inspections. With a commitment to delivering unmatched durability and performance, our kellys are designed to meet the demands of critical drilling operations. Choose us as your trusted supplier for high-quality drilling solutions
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    Product Details

    Product Features

    100% non-destructive testing (NDT) of critical stress areas
    Threads undergo cold rolling for enhanced fatigue resistance
    Each kelly is traceable via heat number and serialized documentation
    Compliance with API Spec 7, ISO 9001, and regional safety standards
    Kellys are made from AISI 4145H modified alloy bars which are quenched and tempered to full length. A hardness range of 285 to 341 BHN and a minimum impact value of 40 ft-lbs. All ends and center drive sections are machined. The kellys are precision-trepanned to provide true bores.
    kelly 2
    Kelly 3

    Kelly Specification

    Nom. Size

    Top Connection(LH)

    Bottom Connection

    I.D. (in)

    Drive Section

    (in)

    (in)

    Nom. Size

    Standard

    Optional

    Square

    Hex.

    Square

    Hex.

    A

    B

    (in)

    O.D.(in)

    O.D.(in)

    O.D.(in)

    O.D.(in)

     

     

     

     

    2 1/2

    6-5/8REG 7-3/4

    4-1/2REG 5-3/4

    NC26

     

    1 1/4

     

    3 2/7

     

    3

    6-5/8REG 7-3/4

    4-1/2REG 5-3/4

    NC31   4-1/8

    NC26   3-3/8

    1 3/4

    1 1/4

    4    

    3 3/8

    3 1/2

    6-5/8REG 7-3/4

    4-1/2REG 5-3/4

    NC38   4-3/4

    NC31   4-1/8

    2 1/4

    1 3/4

    4 1/2

    4

    4 1/4

    6-5/8REG 7-3/4

    4-1/2REG 5-3/4

    NC46   6-1/4

    NC38   4-3/4

    2 4/5

    2 1/4

    5 4/7

    4 4/5

    6-5/8REG 7-3/4

    4-1/2REG 5-3/4

    NC50   6-3/8

    NC38   4-3/4

    2 4/5

    2 1/4

    5 4/7

    4 4/5

    5 1/4

    6-5/8REG 7-3/4

     

    5-1/2FH   7

    NC46   6-1/4

    3 1/4

    3

    7

    6

    6-5/8REG 7-3/4

     

    NC56     7

    NC50   6-3/8

    3 1/4

    3 1/4

    7

    6

    6

    6-5/8REG 7-3/4

     

     

    5-1/2FH   7

     

    3 1/2

     

    6 4/5

    6-5/8REG 7-3/4

     

     

    NC56    7

     

    3 1/2

     

    6 4/5

    Connection

    Hole Size

    Fishing Neck

    ID

    OAL

    Fishing Neck length

    Blade Length

    Blade Width

    8-5/8 REG Box x pin

    42"

    11"

    3"

    118-130"

    32"

    24"

    6.5"

    7-5/8 REG Box x pin

    36"

    9.5"

    3"

    110-120"

    30"

    22"

    6.5"

    7-5/8 REG Box x pin

    28"

    9.5"

    3"

    100-110"

    30"

    20"

    4"

    7-5/8 REG Box x pin

    26"

    9.5"

    3"

    100-110"

    30"

    20"

    4"

    7-5/8 REG Box x pin

    24"

    9.5"

    3"

    100-110"

    30"

    20"

    4"

    7-5/8 REG Box x pin

    22"

    9.5"

    3"

    100-110"

    30"

    20"

    4"

    7-5/8 REG Box x pin

    17 1/2"

    9.5"

    3"

    90-100"

    30"

    18"

    3.5"

    7-5/8 REG Box x pin

    16"

    9.5"

    3"

    90-100"

    30"

    18"

    3.5"

    6-5/8 REG Box x pin

    12 1/2"

    8"

    2 13/16"

    79-90"

    30"

    18"

    3"

    7-5/8 REG Box x pin

    12 1/4"

    8"

    2 13/16"

    79-90"

    30"

    18"

    3"

    4 1/2 IF Box x pin

    8 1/2"

    6 3/4"

    2 13/16"

    65-72"

    28"

    16"

    2.25"

    3-1/2 IF Box x pin

    6"

    4 3/4"

    2 1/4"

    60-66"

    28"

    16"

    2"

    Frequently Asked Questions (FAQ)

    What kind of testing do the kellys undergo?
    Our kellys undergo 100% non-destructive testing (NDT) specifically targeting critical stress areas to ensure maximum reliability and safety in operations.
    How is the fatigue resistance of the threads improved?
    The threads undergo a precise cold rolling process, which significantly enhances their fatigue resistance and extends the overall lifespan of the connection.
    Are the products traceable for quality assurance?
    Yes, every single kelly is fully traceable via its unique heat number and comes with complete serialized documentation for strict quality control.
    What industry standards do your kellys comply with?
    Our products are manufactured in strict compliance with API Spec 7, ISO 9001, as well as various regional safety and quality standards.
    What material are the kellys manufactured from?
    They are made from premium AISI 4145H modified alloy bars, which are quenched and tempered to their full length for optimal structural integrity.
    What are the hardness and impact value specifications?
    The kellys maintain a consistent hardness range of 285 to 341 BHN and guarantee a minimum impact value of 40 ft-lbs, ensuring excellent durability.

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