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Colored galvanized hexagonal drill tail wire
Rainbow chromate passivation (c2C) on the basis of electrogalvanizing, coating thickness 8-15μm, salt spray test for more than 72 hours. When using trivalent chromium passivation process, it complies with RoHS environmental protection directive, and the hexavalent chromium content is ≤1000ppm.
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Product Introduction
Surface treatment: rainbow chromate passivation (c2C) on the basis of electrogalvanizing, coating thickness 8-15μm, salt spray test for more than 72 hours. When using trivalent chromium passivation process, it complies with RoHS environmental protection directive, and the hexavalent chromium content is ≤1000ppm.
Performance upgrade: corrosion resistance is more than 3 times higher than electrogalvanizing, suitable for outdoor humid or mild acid and alkali environment. The tensile bearing capacity of M6 specification in C30 concrete is about 22kN.
Application scenarios: photovoltaic bracket installation, bridge maintenance, port equipment fixing, etc., with both anti-corrosion and decorative requirements.
Key comparison and selection recommendations
| Type | Surface treatment | Salt spray test | Hardness range | Corrosion resistance | Environmental protection | Typical application scenarios |
| Electro-galvanized hexagonal head | Silvery white | 24-48 hours | HV560-750 | General | No hexavalent chromium | Indoor steel structure, ordinary mechanical connection |
| Colored zinc-plated hexagonal head | Rainbow color | More than 72 hours | HV580-720 3 | Good | Trivalent chromium environmental protection | Outdoor photovoltaic bracket, port equipment |
| Black zinc-plated hexagonal head | Black | More than 96 hours | HV600-700 | Excellent | Trivalent chromium environmental protection | Automobile chassis, high-temperature equipment |
| Electro-galvanized cross countersunk head | Silvery white | 24-48 hours | HV580-720 | General | No hexavalent chromium Indoor decoration, furniture manufacturing | Colored zinc-plated cross countersunk head |
| Rainbow color | More than | 72 hours | HV580-720 | Good | Trivalent chromium environmental protection | Outdoor awnings, bathroom equipment |
Selection suggestions:
Environmental factors: For outdoor or high humidity environments, color zinc plating or black zinc plating is preferred; for indoor dry environments, electroplating zinc can be selected.
Load requirements: For high-load scenarios (such as bridges and heavy machinery), black zinc-plated hexagonal drill tail screws must be selected. Specifications above M8 must be tested for torque according to GB/T 3098.11.
Environmental requirements: Electroplating zinc (chromium-free) is recommended for the medical and food industries; trivalent chromium passivated color zinc plating or black zinc plating can be selected for ordinary industrial projects.
Installation specifications:
Electric drill speed control: 3.5mm diameter drill tail screws are recommended to be 1800-2500 rpm, and 5.5mm diameter drill tail screws are recommended to be 1000-1800 rpm.
Torque control: The torque of the M4 specification is about 24-28kg・cm, and the M6 specification is about 61-70kg・cm. Avoid deformation of the substrate due to excessive tightening.
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