S-90377A112 0.125" ID x 0.344" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel with black-oxide coating, ideal for harsh industrial environments
• Enhanced load distribution with precise 0.125" ID and 0.344" OD dimensions, preventing surface damage and loosening
• Consistent performance ensured by Rockwell B68 hardness, maintaining structural integrity under pressure
• Perfect fit for No. 4 screws with inch system specifications, reducing assembly errors and improving efficiency
• Durable thickness range of 0.050-0.080" providing reliable spacing and vibration resistance in mechanical assemblies
• Compliance with global standards including RoHS 3 and REACH, ensuring safe and sustainable use across industries
• Long-term cost savings due to stainless steel's durability, minimizing replacement needs in heavy-duty applications

Professional Applications & Engineering Value

These Black-Oxide 18-8 Stainless Steel Flat Washers address critical engineering challenges in corrosive or high-stress environments. The 18-8 stainless steel core offers excellent resistance to rust and chemical exposure, while the black-oxide surface treatment adds an extra layer of protection against oxidation and wear. With a 0.125" inner diameter and 0.344" outer diameter, these washers provide optimal load distribution for No. 4 screw sizes, preventing fastener loosening and material deformation in assemblies. Commonly used in industrial machinery, automotive systems, and outdoor equipment, they ensure reliable performance where vibration and environmental factors threaten joint integrity. The precise dimensions and Rockwell B68 hardness guarantee consistent seating and long-term stability, reducing maintenance costs and downtime in heavy-duty applications.

Specification Summary & Compliance

This flat washer meets inch system standards with an inner diameter of 0.125", outer diameter of 0.344", and thickness range of 0.050-0.080". Manufactured from 18-8 stainless steel with a black-oxide finish, it ensures dimensional accuracy and Rockwell B68 hardness for reliable performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety requirements for industrial use.