S-93852A153 1.875" ID x 4" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-term reliability in harsh environments
• Exceptional load distribution thanks to the large 4" outer diameter, preventing surface damage and joint loosening
• Precise fit for 1 3/4" screws with 1.875" inner diameter ensuring secure fastening and reduced vibration
• Heavy-duty durability with thickness ranging from 0.153" to 0.213" for high-stress industrial applications
• Compliance with ASME B18.21.1 standards guaranteeing consistent quality and dimensional accuracy
• Environmental safety assurance through full RoHS 3 and REACH compliance, meeting strict regulatory requirements
• Versatile inch system compatibility for seamless integration with existing USS-standard machinery and equipment

Professional Applications & Engineering Value

This USS flat washer is engineered to address critical challenges in heavy-duty industrial applications, where corrosion, vibration, and high loads compromise fastener integrity. The 18-8 stainless steel material provides excellent resistance to rust and chemical exposure, making it ideal for marine, chemical processing, and outdoor construction environments. Its large outer diameter (4") effectively distributes clamping force over a wider area, preventing surface indentation and maintaining structural integrity under dynamic loads. Designed specifically for 1 3/4" screw sizes, this washer ensures precise alignment and reduces the risk of bolt loosening in vibrating machinery, bridges, and structural steel assemblies. The ASME B18.21.1 compliance guarantees dimensional consistency and mechanical performance, while the RoHS and REACH compliant surface treatment ensures environmental responsibility without sacrificing durability.

Specification Summary & Compliance

This USS flat washer features an inner diameter of 1.875", outer diameter of 4", and thickness ranging from 0.153" to 0.213", manufactured to ASME B18.21.1 specifications for dimensional accuracy and performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial use.