S-90377A135 0.109" ID x 0.312" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel, ideal for harsh industrial environments
• Enhanced load distribution with precise 0.312" OD and 0.109" ID, preventing surface damage and loosening
• Consistent performance under stress due to Rockwell B68 hardness, maintaining shape and function
• Reliable thickness tolerance (0.050-0.080") ensures uniform pressure and secure fastening
• Environmental compliance assurance with RoHS 3 and REACH standards, meeting global regulatory requirements
• Optimized for No. 3 screw sizes, providing exact fit and reducing assembly errors
• Durable black-oxide finish adds extra protection against wear and aesthetic degradation

Professional Applications & Engineering Value

This flat washer is engineered to address common industrial challenges like fastener corrosion, vibration-induced loosening, and regulatory non-compliance. Made from Black-Oxide 18-8 Stainless Steel, it offers exceptional resistance to rust and chemicals, making it suitable for outdoor equipment, marine hardware, and chemical processing plants. The precise 0.109" ID and 0.312" OD ensure optimal load spreading, protecting surfaces from indentation and extending the life of assemblies. With a Rockwell B68 hardness, it withstands repeated stress without deforming, while the inch-based sizing and No. 3 screw compatibility streamline maintenance and replacement in machinery, electronics, and automotive systems. Its compliance with environmental standards adds value for businesses targeting sustainable and safe manufacturing practices.

Specification Summary & Compliance

This washer features an inner diameter of 0.109", outer diameter of 0.312", and thickness range of 0.050-0.080", designed for use with No. 3 screw sizes in inch measurement systems. It is manufactured from 18-8 Stainless Steel with a black-oxide finish and hardened to Rockwell B68 for consistent performance. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial applications.