CNC Machining & API Threading for Core Drilling Equipment

At DHANBAD ENGINEERING , we provide high-precision CNC machining and API threading services dedicated to the core drilling industry—serving applications in mining exploration, geotechnical drilling, oil & gas, and construction. Our advanced machining capabilities are tailored to meet the extreme durability and accuracy required in downhole drilling environments.

Precision Machining for Core Drilling Components

We manufacture and repair a wide range of core drilling tools and components including:

• Core barrels (triple tube, double tube)

• Drill rods and casing pipes

• Drill subs and adapters

• Diamond core bits

• Reaming shells

• Core lifters and inner tube assemblies

• Mud pump components (liners, pistons, valve seats, etc.)

Using state-of-the-art CNC lathes and mills, we ensure consistent, repeatable accuracy for each part. We work with a variety of high-grade materials including 4145H steel, tool steels, and carbide inserts, ensuring each component withstands high torque, pressure, and abrasive environments.

Expert API and Custom Threading Services

Threading is one of the most critical aspects of downhole equipment. We provide API-standard and custom threads with precise fit and finish. Our team has extensive experience in machining:

• API Threads:

  • Regular (REG)

  • Full Hole (FH)

  • Internal Flush (IF)

  • PAC (Premium Alloy Connection)

  • ST and XT threads for compact tool joints

• Wireline Core Drill Threads:

  • BQ, NQ, HQ, PQ thread profiles

  • DCDMA standards for core rods and casing

  • Tapered threads for core barrels and adapters

Each thread is inspected with precision gauges and matched for interchangeability, torque strength, and fluid sealing. We also offer thread repair, re-cutting, and hardfacing services to extend tool life and save on costs.

Diamond Core Bits & Reaming Shell Machining

Our shop supports diamond bit refurbishment and new matrix body and impregnated core bit machining. We accurately machine:

• Bit shanks and thread connections

• Gauge diameter surfaces

• Waterway and flushing port features

• Matrix profiles for optimal rock penetration

We ensure that diamond bits fit perfectly with your core barrel assemblies, reducing vibration, improving core recovery, and enhancing drilling efficiency.

Mud Pump CNC Machining and Repair

We also offer CNC services for mud pump components, including:

• Pump liners and sleeves

• Valve bodies, valve seats, and plungers

• Crossheads and connecting rods

• High-pressure manifolds and flanges

Our precise machining ensures optimal fluid flow, seal integrity, and wear resistance, extending the life of your pump systems under heavy-duty operating conditions.

Why Choose DHANBAD ENGINEERING ?

✅ Decades of experience in the drilling industry
✅ In-house CNC machining and threading expertise
✅ Full compliance with API 5B, DCDMA, and OEM specifications
✅ Fast turnaround and emergency repairs
✅ Trusted by exploration, mining, and drilling contractors across [your region/country]

We are proud to support the exploration and drilling industries with components built to last. Whether you need new manufacturing, rethreading, or custom fabrication, we are your go-to partner for precision work.