Blue-White Zinc Plated Self-Tapping Thread Insert

Blue-white zinc plated self-tapping thread inserts are fasteners with a surface treatment that provides excellent rust and oxidation resistance. The blue-white zinc coating slows corrosion in humid, dusty, or harsh environments, extending service life. These inserts do not require pre-tapping and can be directly screwed into soft materials such as aluminum or plastic to form strong internal threads. They effectively prevent thread stripping or loosening, offering a reliable solution for threaded connections with both reinforcement and anti-corrosion benefits.

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Product Features

Blue-White Zinc Coating Protection: The surface features a uniform and dense blue-white zinc coating, with salt spray resistance of 48–96 hours, offering better corrosion protection than uncoated inserts. Suitable for outdoor, high-humidity, and other corrosive environments.
Self-tapping Quick Installation: Equipped with cutting threads, no pre-tapping or adhesive is required. Can be quickly installed into the base material using standard tools, reducing assembly time and labor costs.
Thread Reinforcement: Embedding in soft materials creates 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, suitable for mechanical, electronic, furniture, and other industrial applications.
Clean and Attractive Appearance: The blue-white coating provides a smooth, uniform light blue-white finish without burrs, combining functional protection with visual appeal, ideal for applications where appearance matters.

Applications

Furniture Manufacturing: Thread reinforcement in panel furniture and hardware components to ensure structural stability and durability.
Electronics & Electrical: Embedding threads in plastic or aluminum housings of communication devices and home appliances to secure interfaces.
Architectural Decoration: Threaded connections for doors, windows, and railings to withstand corrosion in outdoor and humid environments.
Automotive Components: Repairing and reinforcing threads in automotive interior or plastic parts to handle vibrations during vehicle operation.

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.