Non-standard cold-forged carbon steel zinc-nickel alloy black enlarged meson washer hexagonal self-tapping screw is a high-performance fastener. Its core functions are achieved through the synergy of materials, processes, and structural design, as follows.
1. High-strength fastening function
Material advantages:
The carbon steel substrate provides high mechanical strength, and the cold-forging process improves the metal density, so that the screw can withstand large axial tension and shear force, which is suitable for heavy-duty scenarios.
Self-tapping design:
The thread end is equipped with a self-tapping groove, which can be self-drilled on the connected part to form an internal thread, eliminating the pre-drilling step and improving assembly efficiency.
2. Corrosion resistance and durability
Zinc-nickel alloy plating:
The plating contains 12-15% nickel, and the salt spray test can reach 500-1000 hours, far exceeding the 72 hours of ordinary galvanizing. The substrate is protected by sacrificial anodes, which are especially suitable for humid and chemically corrosive environments.
Black surface treatment:
Optional black oxidation (blackening) or zinc-nickel alloy + black passivation, which combines aesthetics with additional rust resistance and reduces light reflection.
3. Structural optimization function
Integrated design of enlarged meson gasket:
Sealing and stress dispersion: The gasket diameter is larger than the standard size, which increases the contact area, prevents loosening and disperses the compressive stress, and protects the surface of soft materials.
Anti-loosening: Some designs add serrations or textures on the bottom of the gasket to increase the friction coefficient and resist loosening caused by vibration.
Hexagonal head type:
Compared with hexagonal or cross-head, it can provide a larger torque contact surface, which can be quickly tightened with a wrench or socket, suitable for high-strength fastening needs.
4. Non-standard customization adaptability
Flexible size:
The screw length, thread specification, and gasket outer diameter can be customized according to needs to adapt to non-standard apertures or special assembly spaces.
Adaptation to special working conditions:
Such as hardening heat treatment for extreme loads, or adjusting the thread pitch to adapt to the tapping requirements of different materials.
Typical application scenarios
Automobile manufacturing: engine brackets and battery boxes, which play a role in providing corrosion resistance and vibration resistance.
Electronic equipment: 5G base station housing, electromagnetic shielding + anti-rust effect.
Building curtain wall: aluminum plate fixing, sealing, + wind pressure resistance.
Key performance comparison
Corrosion resistance: Ordinary galvanized screws can pass the 72-hour salt spray test, and this product can pass the 500-1000-hour salt spray test.
Self-tapping ability: Ordinary galvanized screws need to be pre-drilled, and this product is self-tapping.
Washer function: Ordinary galvanized screws need to be equipped with additional washers, while this product uses an integrated enlarged washer.
Through the above design, this screw has comprehensive advantages in strength, corrosion resistance, installation efficiency, and adaptability, meeting the stringent requirements of high-end industrial fields for fasteners.
