Stainless Steel Combination Drive Screws Fasteners

Product introduction

Stainless steel combination drive screws are high-performance fasteners that integrate screws, spring washers and flat washers, and usually use special drive grooves. It is based on the excellent corrosion resistance of stainless steel fasteners. Through combined design, it achieves the core goals of high installation efficiency and good anti-loosening performance of non-standard fasteners. Its working principle is that during installation, the pre-installed washers are screwed in synchronously with the screws, completing the tightening and locking at one time, avoiding the problem of scattering and missing gaskets on site. This design is particularly suitable for occasions requiring high reliability and fast assembly, and is an important upgrade to traditional single screws.

 

Product design and features

Integrated combination design: screws, spring washers and flat washers are combined into one before leaving the factory. This is not only a simple physical combination, but also an optimization for the functional requirements of special-shaped fasteners, ensuring accurate positioning of the gasket and exerting the best anti-loosening and pressure dispersion effects.

 

High-performance drive groove: Different from ordinary cross or slot grooves, high-end products will adopt special drive systems such as (providing better torque transmission and reducing screwdriver slippage) or AW (asymmetrical waveform, achieving higher screw-in speed and anti-exit force). These designs significantly improve installation efficiency, connection reliability and tool life.

 

Advanced anti-loosening and protection mechanisms: Some innovative designs, such as integrating spring retaining rings and compression springs on screws, constitute a sophisticated structure in the field of cold heading non-standard parts. This design not only prevents loosening during installation, but also ensures that the screws do not fall off during disassembly, protecting the structural integrity of the connecting plates.

 

Precision manufacturing process: mainly manufactured by cold heading molding process. Cold heading non-standard parts are produced through cold heading technology, which can maintain the continuity of metal fibers and make the products have higher strength and better mechanical properties.

 

Materials and application areas

A2 (304), general type, good resistance to atmospheric corrosion and chemical corrosion, typical application environment: indoor electrical equipment, ordinary machinery, dry industrial environment.

A4 (316), containing molybdenum, significantly improves the resistance to chloride corrosion (such as salt water). Typical application environments: coastal outdoor equipment, ship assembly, chemical equipment, food processing.

 

Wide range of applications: With its corrosion resistance and reliable anti-loosening properties, stainless steel combination drive screws are important stainless steel fasteners for harsh environments. They are widely used in: high-end electronics and electrical: internal connections of precision electronic products, and fixing of large distribution box casings. Precision machinery and equipment: machine tools, textile machinery, food processing machinery, etc. are critical connection points that need to withstand vibration and pressure.

Transportation and energy: In automobile parts, ship decks, and wind power equipment, the use of special-shaped fasteners can effectively cope with high vibration and corrosive environments. Outdoor and infrastructure: building curtain walls, outdoor sports facilities, bridge ancillary structures and other places exposed to wind and rain for a long time.

 

Quality control and certification system

Follow international standards: product production strictly refers to GB (Chinese national standard), DIN (German standard), ISO (international standard), etc. For the mechanical properties of stainless steel screws, the latest version of the ISO 3506-3:2025 standard is the key basis, which stipulates the performance requirements of stainless steel fasteners within a specific temperature range.

Comprehensive testing items: From raw materials to finished products, multiple tests are required. Core items include:

Mechanical performance testing: tensile strength, yield strength, hardness testing to ensure load-bearing capacity.

Anti-corrosion test: Neutral salt spray test (NSS) to evaluate its corrosion resistance. High-quality products are usually required to be rust-free for more than 72 hours.

Accuracy and process testing: thread pass and stop gauge inspection, torque coefficient determination, metallographic structure analysis, etc.

Authoritative certification: Leading manufacturers usually hold ISO 9001:2015 quality management system certification, and some products can also provide test reports required for specific market access certifications such as CE according to customer needs.

 

Customized services

When standard products cannot meet unique needs, professional customization services are the way to obtain ideal non-standard fasteners. The customization of cold heading non-standard parts and special-shaped fasteners covers multiple dimensions:

Dimensions: support metric and imperial systems, customized non-standard diameter, length and pitch;

Structure and head: customized pan head, countersunk head, hexagonal head, etc.; special gaskets or anti-loosening components (such as nylon rings) can be integrated;

Materials and treatments: In addition to 304/316 stainless steel, special materials such as titanium alloy are also available; the surface can be passivated, plated, etc. to meet specific salt spray requirements.

Driving method: In addition to conventional cross and hexagonal, special drive grooves can be customized to enhance installation professionalism.

Suggestions for customization process: Clarify requirements: provide detailed drawings or instructions, including size, material, performance (such as strength, salt spray time), application scenarios, etc. Sample Validation: Asking suppliers to provide samples for physical testing and verification is a critical step to avoid batch errors. Evaluate suppliers: Check whether they have ISO certification, professional testing equipment and successful customization cases.

 

FAQ

Q: When purchasing customized parts, what are the minimum order quantities and delivery times?

A: It depends on the complexity of the part and the craftsmanship. For cold heading non-standard parts, the minimum order quantity may be several thousand to ten thousand pieces; for CNC processed complex special-shaped fasteners, the minimum order quantity may be as low as 50-100 pieces. Delivery time usually ranges from 7 to 75 days after receipt of confirmed drawings.

 

Q: How to distinguish between 304 and 316 stainless steel materials?

A: The most reliable method is to look at the material certificate or perform spectral analysis. The magnetic test is not completely accurate because 304 may also become weakly magnetic after cold processing. It is difficult to distinguish the two directly in appearance, so do not judge based on price alone.

 

Q: What parameters do product test reports mainly look at?

A: Focus on tensile strength/yield strength (reflecting load-bearing capacity), salt spray test time (reflecting corrosion resistance), hardness and thread accuracy. These are the core performance indicators to measure the qualification of stainless steel fasteners.

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