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API Spec 7-1 Heavy weight drill pipe
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API Spec 7-1 Heavy weight drill pipe

TAKELO is dedicated to the engineering precision and continuous innovation of Heavy Weight Drill Pipe (HWDP), ensuring reliable performance across challenging drilling environments worldwide. Designed as a transitional section in the drill string, HWDP connects drill collars with drill pipes, significantly reducing stress concentration and minimizing fatigue at the critical interface.

Our HWDP covers sizes from 2-7/8" to 6-5/8", manufactured in strict compliance with API Spec 7-1, GOST, and NS-1. Integral HWDP is forged from AISI 4145HM alloy steel, while welded HWDP is produced with AISI 4137/4145HM tool joints and AISI 1340 pipe bodies, providing superior mechanical strength and fatigue resistance.

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    product Information

    Feachtures

    Quenching and tempering heat treatment for optimized toughness and wear resistance.
    100% FLUT inspection on pipe bodies (longitudinal, transverse, ultrasonic thickness), and 100% UT/MPI on tool joints, upset ends, and weld zones.
    Optional upgrades: make-up/breakout torque tests, cold-rolled threads, spiral grooves on center wear pads.
    Performance enhancing surface options include internal plastic coating (IPC) and hardbanding for extended tool life.
    ● Coating Options: TK34, TK34P, TC2000, DPC2000
    ● Hardbanding Options: Arnco 100XT, Arnco 300XT, etc.

    With extensive field applications in both onshore and offshore drilling, TAKELO HWDP has repeatedly demonstrated lower failure rates and extended run life, making it a trusted choice for operators seeking durability and reduced non-productive time (NPT).

    Heavy weight drill pipe 2
    Heavy weight drill pipe
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    Product Specification

    Size

    （in)
    1. D.

    (In)

    I.D. (in)

    Tool Joint O.D. (in)

    Tool Joint ID. (in)

    Connection

    Max. Elevator Diameter(in)

    Central upset

    Dia.(in)

    Min. Drift

    Dia. Size(in)

    3 1/2

    3 1/2

    2 1/4

    4 3/4

    2 1/4

    NC38

    3 7/8

    4

    2

    2 1/16

    (4 7/8,5)

    2 1/16

    1 13/16

    4

    4 

    2 1/2

    5 1/4

    2 1/2

    NC40

    4 3/16

    4 1/2

    2 1/4

    2 9/16

    2 9/16

    2 5/16

    4 1/2

    4 1/2

    2 11/16

    6 1/4

    2 11/16

    NC46

    4 11/16

    5

    2 7/16

    2 3/4

    2 3/4

    2 1/2

    2 13/16

    2 13/16

    2 9/16

    5

    5

    3

    6 5/8

    3

    NC50

    5 1/8

    5 1/2

    2 3/4

    5 1/2 

    5 1/2

    3 1/4

    (7 1/4,7 1/2)

    3 1/4

    5 1/2 FH

    5 11/16

    6

    3

    3 3/8

    3 3/8

    3 1/8

    3 7/8

    3 7/8

    3 5/8

    4

    4

    3 3/4

    6 5/8

    6 5/8

    4

    8 (8 1/4,8 1/2)

    4

    6 5/8 FH

    6 15/16

    7 1/8

    3 3/4

    4 1/2

    4 1/2

    4 1/4

    5

    4 3/4

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