S-90377A151 0.328" ID x 0.625" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction with black-oxide finish, ideal for harsh industrial environments
• Excellent load distribution with precise 0.328" ID and 0.625" OD dimensions, preventing surface damage and maintaining joint integrity
• Enhanced durability with Rockwell B68 hardness rating, ensuring long-term performance under repeated stress
• Reliable chemical resistance from black-oxide surface treatment, protecting against industrial contaminants and moisture
• Perfect fit for 5/16" fasteners with inch system compatibility, ensuring easy installation and secure fastening
• Environmental compliance assurance with RoHS 3 and REACH compliance, meeting global regulatory standards
• Consistent thickness control (0.110-0.140") for uniform pressure distribution and vibration resistance

Professional Applications & Engineering Value

These black-oxide 18-8 stainless steel flat washers deliver critical engineering value in applications where corrosion resistance and mechanical strength are paramount. The 18-8 stainless steel composition combined with the protective black-oxide finish creates a robust barrier against chemical exposure, moisture, and atmospheric corrosion, making them ideal for industrial equipment, marine applications, and outdoor machinery. The precise 0.328" ID and 0.625" OD dimensions ensure perfect alignment with 5/16" fasteners, preventing bolt loosening from vibration while distributing clamp load evenly across surfaces. This combination of material excellence and dimensional precision solves common industrial challenges including galvanic corrosion, joint failure, and maintenance frequency in demanding operating conditions.

Specification Summary & Compliance

Manufactured to inch system standards with precise internal diameter of 0.328" and outer diameter of 0.625", these flat washers maintain consistent thickness between 0.110-0.140" for reliable performance. The 18-8 stainless steel material with Rockwell B68 hardness ensures mechanical durability while the black-oxide surface treatment enhances corrosion protection. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety standards for global industrial applications.