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0102030405

China 4145H Non-Mag Drill Collar Factory & Suppliers - High Strength, API Compliant Drilling Solutions

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 tools are designed to provide optimal weight on bit (WOB), significantly enhancing drilling efficiency and stabilizing the bottom hole assembly (BHA). By resisting bending and whipping during rotation, drill collars reduce vibration and wear on downhole tools, ultimately improving drilling accuracy and extending the lifespan of equipment, Our drill collars are manufactured from high-strength AISI 4145H modified alloy steel and non-magnetic materials, ensuring compliance with API Spec 7-1, GOST, and NS-1 standards. Each product undergoes a thorough quenching and tempering process to achieve optimized mechanical properties, delivering unmatched durability and reliability even under the most demanding drilling conditions, As a leading supplier and factory in China, we are committed to delivering top-quality drill collars that meet the rigorous standards of the industry. Partner with us for reliable drilling solutions that enhance your operational efficiency and performance

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 your drill collars?

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

What quality and manufacturing standards do you follow?

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

How do you test the drill collars for defects?

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

Are there optional surface treatments for harsh 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 do you enhance the fatigue resistance of the drill collars?

All drill collars are equipped with advanced thread root cold-rolling and optional phosphatizing treatment. This enhances fatigue resistance and minimizes galling during make-up and breakout cycles.

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