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Non-Magnetic Drill Collar Manufacturing in China: High-Strength AISI 4145H by Trusted Suppliers and Factory

Drill collars are essential components in the drilling industry, effectively transferring torque from the top drive or rotary table to the drill bit while minimizing energy loss. These robust tools are crucial for providing weight on bit (WOB), which enhances drilling efficiency and stabilizes the bottom hole assembly (BHA) by resisting bending and whipping during rotation. This leads to a significant reduction in vibration and wear on downhole tools, ultimately improving drilling accuracy and extending the lifespan of equipment, Manufactured in China, our drill collars are made from high-strength AISI 4145H modified alloy steel and non-magnetic materials. As leading suppliers in the industry, we ensure that all our products meet strict API Spec 7-1, GOST, and NS-1 standards. Our factory employs advanced processes to fully quench and temper materials, optimizing their mechanical properties for durability and reliability under the most demanding drilling conditions. Choose our drill collars for superior performance and unmatched quality in your drilling operations

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 Features

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 the drill collars?

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

What quality standards do your products comply with?

All our drill collars are manufactured strictly in accordance with API Spec 7-1, GOST, and NS-1 quality standards to ensure top-tier reliability.

How do you test the drill collar materials for defects?

Every collar undergoes chemical composition and mechanical property testing. Additionally, we perform 100% ultrasonic testing (UT) and magnetic particle inspection (MPI) for internal and surface defects, followed by hydrostatic testing for pressure integrity.

Do you provide custom surface treatments for harsh environments?

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

How is thread galling minimized during operations?

Our drill collars feature advanced thread root cold-rolling and optional phosphatizing treatment. These processes enhance fatigue resistance and minimize galling during make-up and breakout cycles.

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