S-91525A411 0.125" ID x 0.375" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments including marine and chemical applications.
• Enhanced load distribution due to precise 0.375" outer diameter, minimizing surface damage and loosening under vibration.
• Accurate fit for No. 4 screws with a 0.125" inner diameter, ensuring easy installation and secure fastening.
• Consistent durability provided by Rockwell B68 hardness, resisting deformation under pressure for long-term reliability.
• Strict dimensional control with thickness ranging from 0.050" to 0.080", ensuring uniform performance in assembly lines.
• Compliance with global standards including RoHS 3 and REACH, making them safe for regulated industries and export markets.
• Versatile industrial use as flat washers that prevent corrosion-induced failure, reducing maintenance costs.

Professional Applications & Engineering Value

Engineered for demanding settings, these 316 stainless steel flat washers excel in applications where moisture, chemicals, and salt exposure are common, such as marine equipment, chemical processing plants, and outdoor structures. The high chromium and nickel content in the material combats pitting and crevice corrosion, a frequent pain point in industrial fastening. With a Rockwell B68 hardness, they maintain structural integrity under cyclic loads, preventing wear and ensuring that No. 4 screws stay securely fastened. This combination of corrosion resistance and mechanical strength translates to fewer replacements and enhanced safety in critical assemblies, supporting efficient operations in sectors like oil and gas, food processing, and construction.

Specification Summary & Compliance

This flat washer adheres to inch system measurements with an inner diameter of 0.125", outer diameter of 0.375", and thickness tolerance of 0.050–0.080", designed specifically for No. 4 screw sizes. It meets industry standards for material quality and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring the absence of hazardous substances for safe use in global industrial and marine applications.