S-98189A080 0.125" ID x 0.312" OD ASME B18.21.1 General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from A286 stainless steel material, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength with Rockwell C22 hardness, providing excellent load distribution and vibration resistance
• Precise dimensional accuracy (0.125" ID, 0.312" OD) for perfect fit with No. 4 screws, eliminating installation issues
• ASME B18.21.1 certification guarantees consistent quality and performance in demanding industrial applications
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring environmental safety and global market acceptance
• Optimized thickness range (0.025-0.040") provides ideal compression characteristics for various assembly requirements
• Enhanced durability in inch measurement system, maintaining dimensional stability across temperature variations

Professional Applications & Engineering Value

These A286 stainless steel flat washers deliver exceptional engineering value in critical applications where corrosion resistance and mechanical integrity are paramount. The high-performance material composition combined with Rockwell C22 hardness ensures reliable performance in aerospace, chemical processing, and marine environments where standard washers would fail. The precise 0.125" ID and 0.312" OD dimensions provide perfect alignment for No. 4 screws, eliminating misalignment issues that can compromise assembly integrity. The ASME B18.21.1 certification guarantees that these washers meet rigorous industrial standards for dimensional accuracy and material properties, making them ideal for applications requiring consistent performance under vibration, thermal cycling, and mechanical stress conditions.

Specification Summary & Compliance

This flat washer features precise inch system dimensions with 0.125" internal diameter and 0.312" outer diameter, specifically designed for No. 4 screw applications. Manufactured to ASME B18.21.1 specifications with controlled thickness between 0.025-0.040", ensuring consistent performance across production batches. The component maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and unrestricted use in global markets. The A286 stainless steel construction with Rockwell C22 hardness provides mechanical properties suitable for high-stress industrial applications requiring reliable fastening solutions.