Carbon steel flat washer

Hex washer, also known as flat washer, is widely used for load distribution, surface protection, and improving joint stability in mechanical assemblies, steel structures, and industrial equipment.

ZSD Screw specializes in manufacturing high-quality carbon steel flat washers designed for structural reinforcement and industrial fastening systems. By integrating in-house production with strict quality inspection procedures, ZSD Screw supplies international-standard washers to global customers, ensuring consistent performance and reliable load distribution.

Standard flat washer dimensions are manufactured according to DIN, ISO and ASTM standards. Custom drawings and samples are accepted.

Type: Flat Washer.
Inner Diameter Range: M2 – M64.
Outer Diameter: According to DIN / ISO / ASTM standards or custom drawing.
Thickness Range: According to standard specification or customer requirement.
Standard: DIN 125 / DIN 9021 / ISO 7089 / ISO 7093 / ASTM F844.
Tolerance: According to standard or customer drawing.
We supply flat washers in a wide range of materials including: Carbon Steel (Q235, 35#, 45#), Alloy Steel (40Cr), Stainless Steel (304, 316, 316L), Brass and Aluminum (on request)

Strength Grades: Flat washers are available to match bolt grades and structural requirements, ensuring compatible load-bearing performance and joint stability. Heat treatment is completed in-house when required to ensure stable mechanical properties and controlled hardness.

Surface Treatment: To improve corrosion resistance and service life, we offer the following surface finishes: Zinc plated (blue / white / yellow). Black oxide. Hot dip galvanized. Zinc flake coating. Phosphate. Dacromet. Special surface treatments are available according to customer requirements.

Applications: In mechanical equipment manufacturing, ZSD Screw carbon steel flat washers are widely used to distribute clamping force under bolt heads and nuts, reducing surface stress concentration and preventing material deformation. They are applied in machine frames, transmission systems, motors, pumps, compressors, and automated production equipment where consistent load distribution and joint stability are required under vibration and cyclic loading conditions.

In electronic equipment and industrial electronics, carbon steel flat washers are used in control cabinets, enclosures, mounting brackets, and structural supports to improve fastening stability and protect contact surfaces. Proper washer selection helps maintain fastening alignment and reduce the risk of loosening in precision assemblies and industrial control systems.

In the new energy sector, carbon steel flat washers from ZSD Screw are applied in photovoltaic mounting systems, solar support structures, inverter installations, battery racks, and energy storage assemblies. These applications require reliable load distribution and corrosion-resistant surface treatment to ensure stable structural performance under outdoor exposure and temperature variation.

In conventional and renewable power generation facilities, flat washers are used in generator assemblies, turbine systems, auxiliary equipment frames, pipeline supports, and structural connections. Even load distribution and stable fastening are essential to maintain structural integrity under thermal expansion, high load, and long-term vibration.

In the automotive and transportation industries, ZSD Screw carbon steel flat washers are applied in chassis assemblies, engine mounting systems, suspension components, and body structures. They assist in maintaining consistent preload and protecting mating surfaces, contributing to long-term durability under dynamic operating conditions.

In heavy industry and engineering equipment manufacturing, flat washers are widely used in construction machinery, mining equipment, lifting systems, steel structures, and large mechanical assemblies. In equipment such as cranes, excavators, conveyors, and processing systems, washers support stable load transfer and prevent localized surface damage under heavy static and impact loads. ZSD Screw provides flat washers designed to maintain fastening reliability and structural safety in demanding industrial environments.