S-93852A144 1.375" ID x 3" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh or outdoor environments
• Enhanced load distribution from the large 3" OD, preventing surface damage and joint loosening
• Precise fit for 1 1/4" screws with 1.375" ID, ensuring secure fastening and alignment
• Exceptional durability backed by Rockwell B68 hardness for long-term performance under stress
• Guaranteed dimensional consistency through compliance with ASME B18.21.1 standards
• Safe for regulated industries with full RoHS 3 and REACH compliance
• Reliable thickness range (0.136-0.192") for consistent performance in heavy-duty USS applications

Professional Applications & Engineering Value

This USS flat washer delivers critical engineering solutions where corrosion resistance and structural integrity are paramount. The 18-8 stainless steel material effectively combats rust and chemical exposure in marine, chemical processing, and outdoor construction applications. Its heavy-duty design with a large outer diameter (3" OD) distributes clamping force evenly, preventing bolt head embedment and reducing stress concentration on soft or painted surfaces. The precise 1.375" ID ensures a perfect fit for 1 1/4" screw sizes, maintaining alignment and preventing galvanic corrosion in mixed-material assemblies. Engineered to ASME B18.21.1 specifications, this washer provides predictable performance in high-vibration environments, making it a trusted component in machinery, structural steel connections, and industrial equipment.

Specification Summary & Compliance

This flat washer meets ASME B18.21.1 dimensional and manufacturing standards, ensuring precise fit and function. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in environmentally sensitive applications. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B68, it is designed for use with 1 1/4" screws and features an ID of 1.375", OD of 3", and a thickness range of 0.136-0.192".