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China 4145H Non-Magnetic Drill Collar Manufacturing - Top Suppliers & Factory for High-Strength Drilling Solutions

Drill collars are essential components in the drilling process, designed to effectively transfer torque from the top drive or rotary table to the drill bit, ensuring minimal energy loss. These robust tools provide a crucial weight on bit (WOB), which enhances drilling efficiency and stabilizes the bottom hole assembly (BHA) by resisting bending and whipping during rotation. This functionality significantly reduces vibrations and wear on downhole tools, leading to improved drilling accuracy and an extended lifespan for your equipment, Our drill collars are manufactured from high-strength AISI 4145H modified alloy steel and non-magnetic materials, adhering strictly to API Spec 7-1, GOST, and NS-1 standards. The materials undergo a rigorous quenching and tempering process to achieve optimized mechanical properties, ensuring durability and reliability even in the most demanding drilling conditions. As a leading China supplier and factory of drill collars, we are committed to delivering high-quality products that meet the needs of the drilling industry

Product Details

🔬 Drill Collar Testing

All drill collar materials undergo both chemical composition and mechanical property testing prior to machining.

Each collar is subject to 100% ultrasonic testing (UT) and magnetic particle inspection (MPI) to detect internal and surface defects.

Hydrostatic testing is performed to verify pressure integrity and seal performance.

⚙️ Drill Collar Features

✔

Made from 4145H modified alloy steel and non-magnetic materials, suitable for drill collars, spiral drill collars, lifting subs, and crossover subs.

✔

Manufactured strictly in accordance with API Spec 7-1, GOST, and NS-1 quality standards.

✔

TAKELO offers proprietary double shoulder connections and other premium thread designs, with optional cold-rolled thread roots, phosphatizing, nitriding, or tungsten alloy plating to enhance performance and longevity.

✔

Optional services include various types of hardbanding and internal plastic coating (IPC) based on customer specifications.

✔

All drill collars are equipped with advanced thread root cold-rolling and optional phosphatizing treatment to enhance fatigue resistance and minimize galling during make-up and breakout cycles. Thread protectors are used throughout handling and transportation.

✔

Optional surface treatments such as tungsten alloy plating, nitriding, and internal plastic coating (IPC) are available to improve corrosion resistance in high-salinity or sour gas environments, extending service life in harsh drilling conditions.

📊 Drill Pipe Specifications

Size	O.D (mm)	I.D. (mm)	Code	Thread	Length (mm)
3 1/8	79.4	31.8(1-1/4)	NC23-31	NC23	9140
3 1/2	88.9	38.1(1-1/2)	NC26-35	NC26	9140
4 1/8	104.8	50.8(2)	NC31-41	NC31	9140/9450
4 3/4	120.6	50.8(2)	NC35-47	NC35	9140/9450
5	127	57.2(2-1/4)	NC38-50	NC38	9140/9450
6	152.4	57.2(2-1/4)	NC44-60	NC44	9140/9450
6	152.4	71.4(2-13/16)	NC44-60	NC44	9140/9450
6 1/4	158.8	57.2(2-1/4)	NC44-62	NC44	9140/9450
6 1/4	158.8	71.4(2-13/16)	NC46-62	NC44	9140/9450
6 1/2	165.1	57.2(2-1/4)	NC46-65	NC46	9140/9450
6 1/2	165.1	71.4(2-13/16)	NC46-65	NC50	9140/9450
6 3/4	171.4	57.2(2-1/4)	NC46-67	NC46	9140/9450
7	177.8	57.2(2-1/4)	NC50-70	NC50	9140/9450
7	177.8	71.4(2-13/16)	NC50-70	NC50	9140/9450
7 1/4	184.2	71.4(2-13/16)	NC50-72	NC50	9140/9450
7 3/4	196.8	71.4(2-13/16)	NC56-77	NC56	9140/9450
8	203.2	71.4(2-13/16)	NC56-80	NC56/6-5/8REG	9140/9450
8 1/4	209.6	71.4(2-13/16)	6-5/8REG	6-5/8REG	9140/9450
9	228.6	71.4(2-13/16)	NC61-90	NC61	9140/9450
9 1/2	241.3	76.2(2-13/16)	7-5/8REG	7-5/8REG	9140/9450
9 3/4	247.6	76.2(3)	NC70-97	NC70	9140/9450
10	254	76.2(3)	NC70-100	NC70	9140/9450
11	279.4	76.2(3)	8-5/8REG	8-5/8REG	9140/9450

❓ Frequently Asked Questions

What materials are used to manufacture TAKELO drill collars?

They are made from premium 4145H modified alloy steel and specialized non-magnetic materials, making them highly suitable for drill collars, spiral drill collars, lifting subs, and crossover subs.

What quality standards do your drill collars comply with?

Our drill collars are manufactured strictly in accordance with recognized international quality standards, including API Spec 7-1, GOST, and NS-1.

How do you test the drill collars for defects before delivery?

Every single collar undergoes 100% ultrasonic testing (UT) and magnetic particle inspection (MPI) to detect any internal or surface defects. We also perform hydrostatic testing to verify pressure integrity and seal performance.

Do you offer custom surface treatments for harsh drilling environments?

Yes, we offer optional surface treatments such as tungsten alloy plating, nitriding, and internal plastic coating (IPC). These treatments significantly improve corrosion resistance in high-salinity or sour gas environments.

How does TAKELO minimize galling during make-up and breakout cycles?

All our drill collars are equipped with advanced thread root cold-rolling. We also offer optional phosphatizing treatment to greatly enhance fatigue resistance and minimize galling during operational cycles.

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