S-91081A044 1.875" ID x 4" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior load distribution with 4" outer diameter to prevent surface damage and maintain joint integrity under heavy loads
• Precision dimensional control with 1.875" inner diameter ensuring perfect fit for 1 3/4" screw sizes
• Robust steel construction providing excellent durability and resistance to deformation in demanding applications
• Variable thickness design (0.153-0.213") accommodating different compression requirements and surface irregularities
• Industry-standard compliance with ASME B18.21.1 ensuring reliable performance and interchangeability
• Environmental responsibility with full RoHS 3 and REACH compliance for safe industrial use
• Heavy-duty performance specifically engineered for construction and mechanical applications requiring maximum reliability

Professional Applications & Engineering Value

This USS flat washer delivers exceptional engineering value through its steel construction and optimized dimensional specifications. The substantial 4" outer diameter provides maximum surface contact area, effectively distributing clamping forces and preventing damage to softer materials or finished surfaces. This is particularly crucial in heavy-duty industrial applications where uneven surfaces or high torque requirements can compromise joint integrity. The precise 1.875" inner diameter ensures perfect alignment with 1 3/4" fasteners, eliminating play and maintaining concentric loading. Engineered to ASME B18.21.1 standards, this washer offers reliable performance in construction equipment, structural steel connections, and mechanical assemblies where consistent load distribution is paramount. The variable thickness range accommodates minor surface variations while maintaining consistent clamping force across the entire contact area.

Specification Summary & Compliance

This USS flat washer features precise dimensional specifications including 1.875" inner diameter, 4" outer diameter, and thickness ranging from 0.153" to 0.213" to accommodate 1 3/4" screw sizes. Manufactured in compliance with ASME B18.21.1 standards for dimensional consistency and performance reliability. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance with current substance restrictions, ensuring environmental responsibility and workplace safety in industrial applications.