Self Drilling Screws For Plastic

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304/316 K2-K6 high salt spray plastic special fast thread screw (plastic self-drilling screw) is a special self-tapping screw designed for high corrosion environment and plastic material characteristics. Our company specializes in the production of fasteners for high salt spray environment. The core products include 304 stainless steel screws, 316 stainless steel screws and K2-K6 plastic special fast thread self-tapping screw series. These products are designed for highly corrosive environments such as marine engineering, chemical equipment, outdoor communication facilities, etc., and are treated by special processes to improve corrosion resistance and mechanical properties significantly.

Product Core Features
Excellent corrosion resistance: 316 marine grade stainless steel can be used. By adding 2-3% molybdenum elements, the resistance to chloride ion corrosion is significantly improved, which is more than 50% higher than the corrosion resistance of 304 stainless steel. It is particularly suitable for seawater environments and chemical equipment.

K series surface treatment: K4/K5/K6 models use patented coating technology to form a nano-level protective layer on the surface of the screw, so that the product remains intact after 2000 hours of salt spray test, far exceeding the industry standard 500 hours requirement3.

Special anti-corrosion for plastics: The K2/K3 series uses PEEK and UV-resistant modified nylon, with a water absorption rate of only 0.065%, and maintains dimensional stability even when exposed to humid environments for a long time.

Product Picture

 

Innovative anti-loosening design: A special nylon ring is implanted on the top of the screw cap to generate continuous friction when tightening, and the anti-loosening effect is increased by 3 times in a vibrating environment; and the double thread design and variable pitch technology are used to generate reverse force when subjected to vibration, achieving mechanical self-locking without the need for additional washers. The unique 30° bevel groove is used in conjunction with a standard spring washer to form multiple locking positions, which are suitable for strong vibration scenarios such as diesel units and high-speed rail components.

Efficient tapping performance: The large lead shallow tooth type thread design increases the installation speed on plastic parts by 40% compared to traditional self-tapping screws, reducing the risk of plastic cracking. The cutting edge is treated with low-temperature ion nitriding, resulting in a surface hardness of HRC55-60, which maintains sharpness while extending service life. The patented three-slot chip guide design effectively discharges cutting debris and avoids stress concentration in plastic parts. It is particularly suitable for engineering plastics such as ABS and polycarbonate.

Optimized strength-to-weight ratio

Lightweight design: The K series products adopt a hollow structure design. While maintaining the same torsional strength, they are 30% lighter than all-metal screws. They are particularly suitable for weight-sensitive aerospace components and new energy vehicle applications.

Raw Material

Cold Forging

Threading

Auto Lathe

Auto Lathe

Table Lathe

CNC Lathe

Quality Checking

Inspection

Packing

Enhanced core treatment: Through cold forging and heat treatment control, the tensile strength of 316 screws reaches 800MPa without increasing the diameter, which is equivalent to carbon steel grade 8.8.

Product series and application scenarios
We provide a complete product line of high salt spray environment screws to meet various needs from ordinary to extreme environments.

The 304 series is suitable for indoor equipment, food machinery, and ordinary outdoor equipment; the 316 marine grade series is specially designed for ship equipment, coastal power stations, and seawater aquaculture equipment. The salt spray protection can reach more than 96 hours. At the same time, the 316 series is also the preferred material for high salt spray stainless steel screws. The K2 general plastic series is designed for general plastics such as PP and PE. It has an optimized 60° tooth angle design and can be regarded as a standard screw for plastic shells. The K3 reinforced nylon series contains glass fiber reinforcement and is suitable for nylon parts, POM, and other engineering plastics. It has excellent UV resistance and is a screw for fixing outdoor plastic parts. K4 is a screw suitable for use in highly corrosive environments. It has a PTFE coating on the surface and is used for chemical pipelines and electroplating equipment. It has an acid and alkali resistance pH range of 1-14. It is a chemical corrosion resistant self-tapping screw. It can often be seen in highly corrosive environments. K5 is a high-temperature special series. It uses PEEK material and can withstand -100°C to +260°C. It is suitable for use in harsh environments with a large temperature difference range. At the same time, it is a solution for plastic screws in high-temperature environments. K6 is an anti-static series product with a surface resistance of 106-109Ω, suitable for electronic clean rooms and explosion-proof equipment. The K6 anti-static series has a surface resistance of 106-109Ω and is used in electronic clean rooms and explosion-proof equipment. It complies with ATEX explosion-proof certification. It also has another nickname, called anti-static screws for explosion-proof equipment.

Clipers Micrometer

Torque

Depth Micrometer

Plug

Thread Guage

Ring Guage

Hardness Tester

Projector

Salt Spray Testing

Customized services and technical capabilities
We provide a full range of corrosion-resistant screw customization services to ensure that the product perfectly matches your specific needs.

Specifications and material customization: support non-standard diameters and special head shapes. 316L ultra-low carbon stainless steel or special alloys can be provided to meet the special needs of high temperature and high pressure environments. The proportion of PEEK glass fiber can be adjusted as required to balance strength and toughness, suitable for environments with large temperature differences and strong vibrations such as automobile engine compartments.

Surface treatment customization: It can be superimposed with galvanizing, chemical nickel, Dacromet and other treatments, with salt spray protection up to 3000 hours, meeting the high protection needs of automobile chassis screws. There are also food-grade coatings available, providing FDA-compliant white or transparent coatings for food processing equipment.

Technical specifications and quality assurance
We strictly implement the ISO 9001 quality management system to ensure that each plastic self-drilling screw meets the highest performance standards.

Salt spray test standard: 316 series implements ASTM B117 standard, no red rust for 96 hours

K series passes 2000 hours accelerated corrosion test

Mechanical performance verification: 304 or 316 stainless steel screws: tensile strength ≥700MPa, elongation ≥30%

K series plastic screws: tensile strength ≥40kg/cm², notch impact strength ≥80kg·cm/cm

Why choose us?
Zeyao Hardware has been deeply involved in the fastener industry for more than 16 years and has profound experience in fastener manufacturing. Whether you need quick payment of standard plastic self-drilling screws or customization for special working conditions, we can provide technical drawing review and working condition adaptation suggestions, making each screw a reliable gene for the equipment.