China Flat Washer Manufacturer, Supplier, Factory

What Are Flat Washers?

Flat washers, also known as plain washers, are simple yet vital components in countless mechanical and industrial assemblies. These thin, disc-shaped plates feature a central hole and are used to distribute the load of a threaded fastener, such as a screw or bolt. By increasing the bearing surface area, they prevent damage to the surface being fastened and reduce loosening caused by vibration or thermal expansion. Our flat washers are manufactured to the highest standards, ensuring reliability and performance in demanding applications across automotive, aerospace, construction, and manufacturing industries.

Key Features and Benefits

• Superior Load Distribution: Protects surfaces from indentation and damage under high stress.
• Vibration Resistance: Helps maintain clamp load and prevents fastener loosening.
• Corrosion Resistance: Available in various materials and platings for enhanced durability in harsh environments.
• Thermal and Electrical Insulation: Certain non-metallic washers provide isolation properties.
• Cost-Effective Solution: A simple, inexpensive way to extend the life of your assembly.

Technical Specifications and Material Selection

Selecting the correct flat washer is crucial for application success. Our product range covers standard sizes and specialized options to meet diverse requirements. Below are the detailed specifications for our most commonly requested flat washers.

Standard Metric Flat Washers (Per ISO 7089)

Standard Inch Flat Washers (Per ASME B18.22.1)

Available Materials and Their Properties

• Carbon Steel: High tensile strength, economical. Often plated for corrosion resistance.
• Stainless Steel (A2/304, A4/316): Excellent corrosion resistance, ideal for harsh environments and food-grade applications.
• Brass: Good corrosion resistance, non-magnetic, and aesthetically pleasing.
• Aluminum: Lightweight, good corrosion resistance, and high electrical/thermal conductivity.
• Nylon/Plastic: Excellent electrical and thermal insulation, lightweight, and resistant to many chemicals.

Industry Standards and Compliance

Our flat washers are produced in compliance with major international standards to guarantee quality, interchangeability, and performance. These include:

• ISO 7089 (Metric Flat Washers)
• ASME B18.22.1 (Inch Series Flat Washers)
• DIN 125 (German Standard Metric)
• ANSI B18.21.1 (American National Standard)

We also offer washers that meet specific military (MIL-SPEC) and aerospace (NAS, MS) standards for critical applications. Rigorous quality control checks, including dimensional verification and material certification, are performed to ensure every batch meets the specified requirements.