S-91081A040 1.375" ID x 3" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Enhanced load distribution with 3" outer diameter to prevent surface damage and extend joint life
• Precise 1.375" inner diameter ensures perfect fit for 1 1/4" screws, eliminating installation issues
• Robust steel construction provides reliable strength and durability for heavy-duty industrial applications
• ASME B18.21.1 compliance guarantees consistent quality and dimensional accuracy across all units
• 0.136-0.192" thickness range offers optimal compression and vibration resistance in varying conditions
• Full RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance in global markets
• USS standard design delivers proven performance in demanding mechanical and structural applications

Professional Applications & Engineering Value

This USS flat washer addresses critical engineering challenges in heavy-duty industrial applications where reliable load distribution and joint integrity are paramount. The steel construction provides exceptional durability against deformation under high bolt tension, while the precise 1.375" ID ensures proper alignment with 1 1/4" screws, preventing thread damage and installation errors. The generous 3" outer diameter significantly increases bearing surface area, effectively distributing clamping forces to protect soft materials and prevent surface indentation. Manufactured to ASME B18.21.1 standards, these inch system washers deliver consistent performance in construction, machinery assembly, and structural steel connections where vibration resistance and long-term reliability are essential.

Specification Summary & Compliance

This USS flat washer features precise dimensional specifications including 1.375" inner diameter, 3" outer diameter, and thickness ranging from 0.136" to 0.192" for optimal performance with 1 1/4" screws. Manufactured in compliance with ASME B18.21.1 standards for dimensional accuracy and quality assurance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant with current substance restrictions, ensuring environmental responsibility and regulatory acceptance for industrial applications worldwide.