S-90474A165 0.188" ID x 0.625" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from black-oxide steel finish, extending service life in humid or demanding industrial environments
• Precise dimensional fit with 0.188" ID and 0.625" OD ensures perfect alignment with No. 8 screws, reducing installation time and improving assembly accuracy
• Optimal load distribution across 0.056-0.071" thickness range prevents surface damage and maintains joint integrity under vibration
• Industry-standard compliance with ASME B18.21.1 guarantees consistent quality and interchangeability in mechanical assemblies
• Environmental regulation adherence through RoHS 3 and REACH compliance eliminates hazardous substance concerns in global supply chains
• Enhanced durability from steel construction provides reliable performance in high-stress automotive, machinery, and construction applications
• Versatile industrial compatibility with inch-system equipment simplifies procurement and inventory management for maintenance operations

Professional Applications & Engineering Value

Engineered to address common fastener failure points, these black-oxide steel flat washers deliver critical protection against galvanic corrosion and surface degradation in electrical enclosures, outdoor equipment, and manufacturing machinery. The precision-controlled thickness tolerance (0.056-0.071") ensures uniform clamping force distribution while preventing embedment in soft materials. As essential components for No. 8 screw assemblies, they effectively mitigate loosening from thermal cycling and mechanical vibration. The ASME B18.21.1 compliant design guarantees dimensional consistency across batch productions, reducing rework rates in automated assembly lines. Their corrosion-resistant properties make them ideal for marine components, agricultural machinery, and industrial controls where moisture and chemical exposure compromise ordinary washers.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 dimensional standards with inch-system measurements: 0.188" inner diameter, 0.625" outer diameter, and 0.056-0.071" thickness range. Material composition meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations regarding chemical safety. The black-oxide surface treatment provides consistent corrosion protection without dimensional interference. Designed specifically for use with No. 8 screw sizes in general industrial applications.