S-90474A137 1.875" ID x 3.25" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with a large 3.25" outer diameter, minimizing surface pressure and preventing material damage under high stress.
• Superior corrosion resistance provided by the zinc yellow-chromate plating, ensuring long-term reliability in harsh industrial environments.
• Guaranteed high strength with a Grade 8 classification and Rockwell C38 hardness, offering reliable performance in critical, heavy-duty applications.
• Precise fit and secure fastening with a 1.875" inner diameter designed specifically for 1 3/4" screw sizes, reducing the risk of loosening.
• Compliance with industry standards per ASME B18.21.1, ensuring consistent quality, dimensional accuracy, and interchangeability.
• Environmental and regulatory safety with full compliance to RoHS 3 and REACH, making them suitable for use in regulated markets and eco-conscious projects.
• Enhanced durability and longevity from the robust steel construction, capable of withstanding repeated stress and vibration without failure.

Professional Applications & Engineering Value

This Grade 8 flat washer is engineered to address common industrial challenges such as joint failure, corrosion-induced degradation, and compliance hurdles. The zinc yellow-chromate plated steel construction provides a formidable barrier against rust and chemical exposure, significantly extending service life in demanding settings like heavy machinery, construction, and structural assemblies. Its high strength and hardness (Rockwell C38) ensure that it maintains clamp load under extreme vibration and tensile stress, preventing bolt loosening and maintaining assembly integrity. By conforming to ASME B18.21.1, these washers deliver consistent performance and dimensional precision, making them a reliable choice for engineers and procurement specialists who prioritize safety, durability, and regulatory adherence in their industrial applications.

Specification Summary & Compliance

This washer features an ID of 1.875", OD of 3.25", and a thickness range of 0.146-0.174", designed for a 1 3/4" screw size. It meets the dimensional and material requirements of the ASME B18.21.1 standard. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances and safe for industrial use.