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Product video
Certifications CE · RoHS

API 7-1 Crossover Sub Box 6-5/8 Reg X Pin NC50 Steel Drill Pipe Adapter Sub for Oilfield Drilling

Available for enquiry 0.0 · 0 reviews
USD

$ 3,430.00 3430.0 USD $ 3,430.00

Not Available For Sale

Minimum order quantity: 1 Units

Key attributes

View all
Type
Rotary Table
Material
Carbon Steel, AISI 4145H / 4145H Mod Forged Steel
Use
Well Drilling
Processing Type
Casting
Machinery test report
Provided
Machine type
Drilling Tool
Product description

Highlights at a glance

  • 1. API 7-1 Standard Compliance & Global Interchangeability Precision Threads: CNC-machining guarantees flawless Box 6-5/8 REG to Pin NC50 profile accuracy, ensuring tight seal and 100% interchangeability with standard drill strings. Torque Transmission: Engineered to withstand high makeup torque and severe bending stress during rotary and directional drilling.
  • 2. Premium Forged AISI 4145H Mod Steel Heavy-Duty Construction: Made from high-strength AISI 4145H Mod forged alloy steel for maximum durability in extreme downhole environments. Full-Length Heat Treatment: Quenched and tempered to deliver high tensile strength, outstanding impact toughness, and maximum fatigue life.
  • 3. Surface Protection & Anti-Galling Treatment Thread Coating: Chemical phosphating or copper-plating treatment prevents thread galling during high-torque makeup. Heavy-Duty Protectors: Equipped with durable composite or steel thread protectors for safe transport and field storage.
  • 4. 100% NDT Inspection & Full Traceability Zero-Defect Quality: Every crossover sub undergoes Ultrasonic Testing (UT) and Magnetic Particle Testing (MT) before shipment. Mill Test Certificate (MTC): Fully compliant with EN 10204 3.1, providing complete heat number traceability from raw forging to finished sub.
  • 5. Versatile Downhole Applications BHA System Compatibility: Ideal connection adapter for Oil & Gas Drilling, Directional/Rotary Drilling, Geothermal, and HDD BHA assemblies. Smooth Mud Flow: Optimized inner bore design minimizes hydraulic loss and downhole pressure drop.
  • 6. OEM Customization & Rapid Delivery Flexible Manufacturing: Fully customizable thread combinations, OD/ID dimensions, shoulder lengths, and optional Hardbanding (Arnco/Castolin) per customer drawings. Fast Dispatch: Standard configurations kept in semi-finished stock to ensure short lead times and minimize rig downtime.
    • Certifications & compliance
    CE
    Complies with EU standards
    RoHS
    RoHS compliant
    Frequently asked questions

    Yes. All our crossover subs are manufactured strictly according to API Spec 7-1 standards. We provide Mill Test Certificates (MTC) according to EN 10204 3.1 with every shipment.

    Absolutely. While Box 6-5/8 Reg x Pin NC50 has standard dimensions, we can adjust the OD, ID, wrench flats (elevator space), and overall length according to your specific bottom hole assembly (BHA) design.

    Yes, we provide chemical phosphating as standard, and copper plating is available upon request for high-torque or severe drilling applications.

    Standard size crossover subs (Box 6-5/8 Reg x Pin NC50) are frequently kept in semi-finished stock. Standard lead time is 7~15 days. For urgent rig-down orders, express dispatch can be arranged.

    We provide full Quality Control Documentation including Material Test Reports (MTR), Heat Treatment Charts, Ultrasonic Test (UT) Reports, Magnetic Particle Test (MT) Reports, and Dimensional Inspection Reports.

    Crossover sub is used to connect drilling components with different thread types in drill string and BHA assembly.
    Description images
    Product detail
    Product detail
    Product detail
    Product detail
    CE
    RoHS
    Packaging and fulfilment
    • Step 1

      Payment and order readiness

      Minimum order: 1 Units

      Payment terms, specifications, and order details are confirmed before preparation begins.

    • Step 2

      Preparation

      30 days

    • Step 3

      Packaging and dispatch

      Multimodal transport · Approx. shipping fee: $ 358.19 for 1 unit · Estimated delivery in 38-48 business days

      Final packing, freight, and delivery dates are confirmed before dispatch.

    Technical specifications
    Other details 23 fields
    Type
    Rotary Table
    Material
    Carbon Steel, AISI 4145H / 4145H Mod Forged Steel
    Use
    Well Drilling
    Processing Type
    Casting
    Machinery test report
    Provided
    Machine type
    Drilling Tool
    Warranty
    1 Year
    Video outgoing-inspection
    Provided
    Weight (kg)
    72
    Place of origin
    China, Hunan
    Top Connection (Box)
    6-5/8" Regular (Box)
    Bottom Connection (Pin)
    NC50 / 4-1/2" IF (Pin)
    Heat treatment
    Full Length Quenched & Tempered (Hardness 285-341 HBW)
    Surface Treatment
    Phosphating / Copper Plating / Anti-rust Oil
    Thread Type
    API Standard Right Hand (Left Hand Available)
    Hardbanding
    Optional (Arnco 100XT/300XT, Castolin, etc.)
    Inspection
    100% UT + MT NDT Inspection
    Application
    HDD, geothermal, Water Well Drilling, Oil & Gas Drilling
    Selling Units
    Single item
    Single package size
    100X60X80 cm
    Single gross weight
    72.000 kg
    Model number
    Crossover Sub
    Certifications & Compliance
    CE, RoHS
    Lead time
    30 days
    Minimum order
    1 Units

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