S-91081A046 2.125" ID x 4.5" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Enhanced Load Distribution - The 4.5" outer diameter provides a wider bearing surface, effectively distributing pressure and preventing surface damage under heavy loads.
• Precise Fit for 2" Fasteners - The 2.125" inner diameter ensures a secure and accurate fit on 2" diameter screws and bolts, minimizing play and vibration.
• Robust Steel Construction - Manufactured from durable steel, this washer offers excellent strength and resistance to deformation in demanding industrial environments.
• Standardized Reliability - Compliance with ASME B18.21.1 ensures consistent quality, dimensional accuracy, and interchangeability with other standard components.
• Versatile Thickness Range - With a thickness of 0.153-0.213", it provides flexibility to accommodate specific assembly requirements and compensate for minor tolerances.
• Environmentally Compliant - Meets RoHS 3 and REACH regulations, making it suitable for use in global markets with strict substance control mandates.
• Corrosion Resistance Foundation - The steel material provides a solid base for various surface treatments, enhancing longevity in different operating conditions.

Professional Applications & Engineering Value

This USS flat washer is engineered to solve critical challenges in heavy-duty industrial applications. Its large 4.5" OD and robust steel construction are specifically designed to prevent bolt head or nut embedding into soft materials and to distribute high clamping forces over a larger area. This is vital in structural steelwork, heavy machinery assembly, and construction projects where joint integrity is paramount. By complying with the ASME B18.21.1 standard, it guarantees dimensional consistency and performance reliability, reducing the risk of assembly failures. The washer's design effectively mitigates issues like material fatigue, loosening due to vibration, and surface damage, providing a simple yet crucial component for maintaining the long-term stability and safety of mechanical connections.

Specification Summary & Compliance

This washer conforms to the dimensional and material requirements of the ASME B18.21.1 standard for inch-series plain washers. Key dimensions include an Inside Diameter (ID) of 2.125", an Outside Diameter (OD) of 4.5", and a Thickness ranging from 0.153" to 0.213", designed for use with a 2" screw size. 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.