S-90474A166 0.234" ID x 0.438" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel finish for extended service life in harsh industrial environments
• Precise dimensional accuracy (0.234" ID, 0.438" OD) ensures perfect fit for No. 12 screws and consistent load distribution
• Optimized thickness range (0.036-0.045") provides reliable spacing and vibration dampening capabilities
• ASME B18.21.1 compliance guarantees consistent quality and interchangeability in mechanical assemblies
• Full regulatory compliance with RoHS 3 and REACH standards for safe use in regulated industries
• Durable steel construction maintains integrity under pressure and repeated use in demanding applications
• Standard inch system compatibility simplifies integration with existing North American equipment and fasteners

Professional Applications & Engineering Value

These black-oxide steel flat washers deliver exceptional engineering value by solving critical industrial challenges. The corrosion-resistant coating prevents rust formation in humid or chemically aggressive environments, significantly extending component lifespan. Engineered to ASME B18.21.1 standards, these washers provide reliable load distribution for No. 12 screw applications, preventing surface damage and maintaining joint integrity. The precise 0.234" ID and 0.438" OD dimensions ensure perfect alignment in mechanical assemblies, reducing installation time and eliminating compatibility issues. Ideal for industrial machinery, automotive assemblies, and electrical enclosures, these washers offer predictable performance that engineering teams can depend on for critical fastening applications.

Specification Summary & Compliance

Manufactured to exact ASME B18.21.1 specifications with precise dimensional tolerances for inch system applications. Features a black-oxide steel construction with internal diameter of 0.234", outer diameter of 0.438", and thickness range of 0.036-0.045" specifically designed for No. 12 screw sizes. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and regulatory acceptance across global markets.