S-91860A030 0.375" ID x 0.875" OD ASME B18.21.1 General Purpose Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 17-7 PH stainless steel material, ideal for harsh industrial environments and outdoor applications.
• Superior mechanical strength and durability with Rockwell C40 hardness, ensuring long-term performance under high-stress conditions.
• Precise dimensional fit with 0.375" ID and 0.875" OD, designed specifically for 5/16" screws to prevent loosening and distribute load evenly.
• Reliable compliance with industry standards per ASME B18.21.1, guaranteeing consistent quality and interchangeability.
• Environmental and workplace safety through RoHS 3 and REACH compliance, free from hazardous substances.
• Consistent thickness control (0.073-0.083") for uniform pressure distribution and reduced assembly variability.
• Versatile inch-system compatibility for seamless integration with existing machinery and North American equipment designs.

Professional Applications & Engineering Value

These 17-7 PH stainless steel flat washers address critical engineering challenges in demanding sectors such as aerospace, chemical processing, and marine equipment. The precipitation-hardening stainless steel construction provides excellent resistance to stress corrosion cracking and maintains high strength at elevated temperatures, solving common failure points in extreme operating conditions. The precise 0.375" ID ensures secure seating on 5/16" screws while the 0.875" OD maximizes bearing surface area, effectively preventing embedment in soft materials and distributing clamp load to protect sensitive components. Manufactured to ASME B18.21.1 specifications, these washers deliver reliable performance in vibration-prone assemblies where fastener integrity is paramount.

Specification Summary & Compliance

This flat washer features inch-dimensioned precision with internal diameter of 0.375", external diameter of 0.875", and thickness ranging 0.073-0.083". Manufactured in compliance with ASME B18.21.1 standard for flat washers, ensuring dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations regarding substance restrictions, making it suitable for global industrial applications with environmental requirements.