Carbon Steel Self-Tapping Thread Insert

Carbon steel self-tapping thread inserts are made of high-strength carbon steel, offering mechanical robustness and cost-effectiveness. Suitable for indoor or dry environments with lower corrosion requirements, they provide an economical solution for thread reinforcement. These inserts do not require pre-tapping and can cut directly into soft materials such as aluminum or plastic. They are easy to install and prevent thread stripping or disengagement, providing a high-strength, cost-efficient option for a wide range of assembly applications.

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Product Features

High Mechanical Strength: Made from premium carbon steel, offering excellent tensile and impact resistance, suitable for high-load fastening applications.
Cost-Effective: Compared to stainless steel, carbon steel has lower production costs, ideal for bulk purchasing and large-scale assembly projects.
Self-tapping Quick Installation: Features built-in cutting threads, no pre-tapping or adhesive required. Can be quickly installed into base materials with standard tools, shortening construction time.
Thread Reinforcement: When embedded in soft materials, it forms high-strength internal threads, significantly improving load-bearing and vibration resistance, preventing thread damage.
Coating Options Available: Supports post-processing such as zinc plating or color zinc plating to enhance corrosion resistance, expanding its range of applications.

Applications

General Machinery: Thread reinforcement in indoor machinery, such as machine tools and printing equipment, to maintain operational stability.
Furniture Manufacturing: Pre-installing threads in hardware components of panel furniture and office desks/chairs to improve structural strength.
Electronic Devices: Thread reinforcement in plastic housings of consumer electronics and instruments to meet standard assembly requirements.
Sheet Metal Processing: Threaded connections in sheet metal parts, chassis, and cabinets, suitable for indoor dry condition fastening scenarios.

Product Specifications

Type 302 (Slotted Type) Self-Inserting Screw Sleeve
The screw head features a cutting groove and a high-strength, wear-resistant thread. The cutting groove provides self-tapping capability for easy assembly, with strong vibration resistance and anti-loosening performance.

302(slotted type)		Length	External thread	Reference drilling diameter			Minimumdilling depth
The metric system	English system			Plastics	Aluminum alloy	Cast iron
M2-0.4		6	M4.5-0.5	4.0-4.1	4.1-4.2	4.2-4.3	8
M2.5-0.45	U#2-56	6	M4.5-0.5	4.0-4.1	4.1-4.2	4.2-4.3	8
M3-0.5	U#4-40	6	M5-0.5	4.5-4.6	4.6-4.7	4.7-4.8	8
M4-0.7	U#8-32	8	M6.5-0.75	5.8-5.9	6.0-6.1	6.1-6.2	10
M5-0.8	U#10-24	10	M8-1.0	7.1-7.2	7.3-7.5	7.5-7.6	13
M6a-1.0		12	M9-1.0	8.1-8.2	8.3-8.5	8.5-8.6	15
M6-1.0	U/14-20	14	M10-1.5	9.0-9.2	9.2-9.3	9.3-9.4	17
M8-1.25	U5/16-18	15	M12-1.5	10.6-10.8	11-11.2	11.2-11.4	18
M10-1.5	U3/8-16	18	M14-1.5	12.6-12.8	13.0-13.3	13.2-13.4	22
M12-175	U7/16-14	22	M16-1.5	14.6-14.8	15.0-15.3	15.2-15.4	26
M14-2.0	U1/2-13	24	M18-1.5	16.6-16.8	17.0-17.3	17.2-17.5	28
M16-2.0	U5/8-11	22	M20-1.5	18.6-18.8	19.0-19.3	19.2-19.5	27
M18-2.5		24	M22-1.5	20.6-20.8	21.0-21.3	21.2-21.5	29
M20-2.5		27	M26-1.5	24.6-24.8	25.0-25.3	25.2-25.2	32

Company Profile

Dongtai Jinzhize Metal Products Co., Ltd.

Dongtai Jinzhize Metal Products Co., Ltd. is a specialized manufacturing facility dedicated to threaded connection products for the automotive and aerospace sectors. We primarily produce Helical Wire Inserts, Self-Tapping Inserts, Key Locking Inserts, Threaded Adapters, Oil Plugs, as well as matching installation taps and tools.

Established in 2015, the company operates from a 10,000-square-meter-owned manufacturing plant equipped with hundreds of machine tools and automated production systems. Through years of development, we have built an experienced team of design, development, and production specialists, complemented by a rigorous quality management system and comprehensive after-sales service mechanism.

Our products are widely utilized in the automotive industry (including engines and transmissions for both passenger and commercial vehicles), the aerospace industry, and rail vehicle manufacturing.

With an annual output value of 153 million RMB in 2024, we possess the capability for a large-scale, stable supply. We are committed to providing customers with highly consistent, traceable products and reliable service support.