Technical characteristics and scope of ASTM F436 washers
The ASTM F436 specification establishes strict requirements for the chemical composition, mechanical properties, and geometric tolerances of hardened steel washers designed for use with high-strength fastening assemblies. The standard covers products with nominal thread diameters ranging from 1/4 to 4 inches and M12 to M100. EV Group China products comply with these standards to ensure reliability in critical metal structures and mechanical engineering.
These washers are optimized for use with fasteners regulated by ASTM A354 and F3125 standards, ensuring optimal distribution of contact stresses in fastening joints.
Classification by materials and coating types
- Type 1: Manufactured from carbon steel followed by heat treatment.
- Type 3: Manufactured from weathering steel with enhanced corrosion resistance.
EV Group China supplies Type 3 steel with a Corrosion Resistance Index (CRI) of 6 or higher, which guarantees the durability of connections in aggressive operating environments.
Design forms and geometric execution
| Washer type | Application features |
|---|---|
| Circular | Universal use for standard fastening assemblies in the diameter range from 1/4″ to 4″ and M12-M100. |
| Beveled | Square or rectangular products with a 1:6 slope for leveling the bearing surfaces of beams and channels. |
| Clipped | Specialized washers for installation in confined spaces where a localized reduction in size is required. |
| Extra Thick | Circular washers with a nominal thickness of 5/16 inch, used when oversized (non-standard) mounting holes are present. |
During the design phase, it is important to note that values for Imperial (inch-pound) and Metric (SI) series are independent standards. Mixing dimension systems in a single assembly is not permitted, as it compromises the integrity of the engineering calculation. EV Group China ensures product delivery strictly in accordance with the selected specification, guaranteeing compliance with all industry safety and quality standards.