Corrosion-Resistant Galvanized Washers for Outdoor Use are flat, circular components engineered to distribute clamping force and protect substrate surfaces in outdoor applications. Manufactured from low-carbon steel (C ≤ 0.20%), they undergo hot-dip galvanization that meets G90 standards (0.9 oz/ft² zinc coating), achieving a thickness of 6.3 mils (0.16mm).
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Product Description
This coating provides 1,500+ hours of salt spray resistance, making them indispensable in coastal, agricultural, and infrastructure projects.
Item | Flat Washer |
Material | Carbon steel ，Stainless Steel |
Grade | 200HV |
Surface treatment | Hot dip galvanized /Zinc Plated /Black Oxide |
Size | M8-M72 |
Thickness | 0.5mm-5mm |
Standard | DIN/ASTM/ANSI/JIS/EN/ISO/ GB |
Package | Plastic bag /Carbon Box /as required |
Delivery time | Within 3-7 days |
Customized support | OEM |
Load Distribution Efficiency: With a diameter 2.5-3 times the bolt shank, they reduce contact pressure from 300 MPa to ≤100 MPa, preventing substrate deformation in wood, concrete, and thin metal.
Edge Treatment: Deburred edges eliminate sharpness, reducing injury risk during installation and preventing damage to gaskets or sealants.
Temperature Stability: Maintains structural integrity in -40°C to 120°C ranges, suitable for both frozen and sun-exposed environments.
Compatibility: Available in plain, beveled, and countersunk designs to match different bolt heads and surface requirements.
Agricultural Structures: Used in barn framing, fence posts, and irrigation pipe supports, resisting fertilizer and manure corrosion.
Transportation Infrastructure: Applied in highway guardrail brackets, railway track fasteners, and airport runway lighting mounts.
Residential Outdoor Projects: Secures deck joists, patio covers, and outdoor lighting fixtures, withstanding seasonal weather changes.
Q: What is the difference between these washers and stainless steel washers?
A: Galvanized washers offer cost advantages for general outdoor use, while stainless steel is preferable for highly corrosive environments.
Q: Can they be used with self-drilling screws?
A: Yes, but select a washer size 1/4" larger than the screw head to ensure proper load distribution.
Q: How to verify coating thickness?
A: Use a magnetic thickness gauge at three points per washer; readings should fall between 70-140μm for G90 compliance.
