Stainless Steel Self-Tapping Thread Insert

Stainless steel self-tapping thread inserts are fasteners designed to strengthen threaded connections. Unlike standard inserts, they are made of stainless steel, providing superior corrosion resistance and rust protection. They maintain stable performance even in humid or high-salinity environments.

These inserts feature self-tapping threads that cut directly into the base material, eliminating the need for pre-tapped holes. Installation is simple and efficient, making them ideal for soft materials such as aluminum or plastic, which are prone to thread stripping or damage. They provide a reliable solution for reinforcing threads in a wide range of assembly applications.

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Product Features

Material Properties: Made of 304 or 316 stainless steel, offering resistance to acids, alkalis, and corrosion. Suitable for outdoor, marine, and chemical environments, it maintains its shape and strength over long-term use.
Self-tapping Installation: Features built-in cutting threads, requiring no pre-tapping or adhesive. Can be quickly installed into the base material using standard tools, reducing assembly time and labor costs.
Thread Reinforcement: Once embedded in soft materials, it forms high-strength internal threads that enhance load-bearing and impact resistance, preventing thread stripping or loosening.
Wide Compatibility: Supports multiple standard thread sizes. Can repair damaged threads or be pre-installed in new components, making it suitable for mechanical, electronic, automotive, and other industrial applications.
Temperature Resistance: Operates reliably in a temperature range from -40°C to 600°C, meeting fastening requirements under both high and low-temperature conditions.

Applications

Industrial Manufacturing: Strengthening threads in machine housings and sheet metal parts to enhance overall structural stability.
Electronics & Electrical: Pre-installing threads in plastic or aluminum housings of communication devices and instruments to ensure secure connections.
Automotive Industry: Thread repair and reinforcement for automotive interior and chassis components, addressing vibrations and shocks during vehicle operation.
Outdoor Facilities: Providing corrosion-resistant threaded connections for railings, photovoltaic supports, and other outdoor metal structures to extend service life.

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.