Types of Flat Washers
USS Washers (Flat)
USS washers, or United States Standard washers, are designed with larger outer diameters to spread the load over a greater surface area. They are well suited for heavy-duty fastening in construction, industrial machinery, and equipment assembly where stability and durability are essential. USS washers help protect materials from bolt or nut pull-through and maintain joint integrity under high stress.
SAE Washers (Flat)
SAE washers, or Society of Automotive Engineers washers, feature smaller outer diameters and tighter tolerances than USS washers. They are widely used in automotive, machinery, and precision equipment where accuracy and compact size are critical. SAE washers provide even load distribution without taking up unnecessary space, making them a preferred choice in applications where alignment and reliability matter most.
Fender Washers (Flat)
Fender washers are characterized by their oversized outer diameters, which distribute load over an even larger area than USS washers. They are commonly used with softer materials such as sheet metal, wood, plastics, and fiberglass. By covering more surface area, fender washers prevent fastener pull-through and add stability to joints that may otherwise be vulnerable. These washers are frequently used in automotive bodywork, appliance manufacturing, and light fabrication.
Flat Washers - Material Options
South Coast Fasteners stocks metric flat washers in durable steel materials engineered for long-term strength and consistency across multiple industries.
Steel
Standard carbon steel washers offer dependable strength for general-purpose fastening. They maintain rigidity under load and are widely used in construction, automotive, and equipment applications. Steel washers provide consistent performance where durability and mechanical stability are critical.
Low Carbon Steel
Low carbon steel washers combine reliable strength with improved ductility for easier installation and a secure fit. They resist cracking under pressure while maintaining solid load distribution. These washers are an excellent choice for general mechanical assemblies and structural joints that require both flexibility and endurance.
Flat Washers - Available Finishes
South Coast Fasteners offers metric flat washers in a variety of protective finishes that improve corrosion resistance, appearance, and service life.
Yellow Zinc CR+6
Yellow Zinc CR+6 provides a vibrant gold tone and strong corrosion protection. The coating enhances both appearance and durability, making it popular for machinery, automotive, and exposed structural fasteners. It’s especially useful where identification and protection are equally important.
Hot Dip Galvanized
Hot Dip Galvanized finish offers exceptional resistance to rust and environmental wear. The thick zinc layer protects against moisture, salt, and outdoor exposure, making it ideal for construction, marine, and agricultural applications. This finish is known for its long-lasting protection in challenging outdoor conditions.
Zinc CR+3
Zinc CR+3 delivers a clean, silver-blue appearance and dependable corrosion resistance for general industrial use. It protects the underlying steel against oxidation while providing a smooth surface for easy assembly. This finish is commonly used across machinery, automotive, and general hardware applications where a professional look and lasting protection are essential.
Why Choose South Coast Fasteners?
South Coast Fasteners supplies USS, SAE, and fender washers that meet demanding standards for strength, consistency, and performance. We maintain a wide inventory to ensure you can always find the right washer for your project, whether it involves structural steel, precision machinery, or lightweight materials. With fast delivery, expert support, and reliable quality, we help you complete work with confidence.
Shop Flat Washers Online at South Coast Fasteners
South Coast Fasteners makes ordering washers simple and convenient. Explore our online selection of USS, SAE, and fender washers, or reach out to our team for help with sizing, specifications, or bulk purchases. Whatever the application, we are here to provide washers that keep your projects strong, secure, and long lasting.
