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API-1 Square & Hexagonal Kelly Manufacturing - Durable Drilling Tools from China Suppliers & Factory

API-1 Square & Hexagonal Kelly Manufacturing - Durable Drilling Tools from China Suppliers & Factory

Discover our top-quality Kellys, essential power transmission tools for drilling rigs, expertly designed to transfer rotational force from the rotary table to the drill string. Manufactured in China, our Kellys are available in two configurations: square and hexagonal, meeting the rigorous standards of API Spec As a leading supplier in the industry, our factory ensures that each connection is precision-machined and subjected to strict quality-assurance inspections. Choose our Kellys for unmatched durability and performance, crucial for critical drilling operations.

    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 Specification

    Nom. Size
    (in)

    Top Connection(LH) (in)

    Bottom Connection (in)

    I.D. (in)

    Drive Section

    Standard

    Optional

    Square

    Hex.

    Square

    Hex.

    A

    B

    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 materials are the kellys manufactured from?
    Our kellys are made from AISI 4145H modified alloy bars, which are fully quenched and tempered to full length to ensure superior strength and durability.
    Are the kellys fully traceable?
    Yes, each kelly is 100% traceable via its specific heat number and serialized documentation provided with the product.
    What quality and safety standards do they meet?
    The kellys strictly comply with API Spec 7, ISO 9001 quality management, and various regional safety standards.
    How is the fatigue resistance of the threads ensured?
    All threads undergo a specialized cold rolling process, which significantly enhances their fatigue resistance and extends operational lifespan.
    Is non-destructive testing performed on the products?
    Absolutely. We perform 100% non-destructive testing (NDT) on all critical stress areas to guarantee structural integrity before delivery.
    What is the hardness range of the material?
    The material maintains a precise hardness range of 285 to 341 BHN along with a minimum impact value of 40 ft-lbs.

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