S-98029A042 0.156" ID x 0.375" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide steel finish, extending service life in demanding environments.
• Exceptional surface durability with a Rockwell 15N85 hardness rating, resisting wear and deformation under load.
• Precise dimensional fit with a 0.156" inner diameter and 0.375" outer diameter, ensuring reliable performance with No. 6 screws.
• Optimal load distribution due to the flat design and controlled thickness (0.068-0.088"), preventing surface damage and loosening.
• Compliance with major environmental regulations, being RoHS 3 and REACH compliant for safe, global industrial use.
• Enhanced assembly reliability in inch-system applications, providing a consistent and secure fastening solution.

Professional Applications & Engineering Value

This black-oxide steel flat washer is engineered to address common industrial challenges such as fastener corrosion and joint failure. The black-oxide coating provides a protective barrier against moisture and chemicals, making it ideal for industrial applications in automotive, machinery, and outdoor equipment where exposure to harsh conditions is frequent. Its Rockwell 15N85 hardness ensures the washer maintains its shape under high stress, reducing the risk of fatigue in No. 6 screw assemblies. By offering consistent dimensions and robust material properties, this washer helps prevent galvanic corrosion, distributes clamping force evenly, and enhances the longevity of your fastener systems, ultimately lowering maintenance costs and improving operational safety.

Specification Summary & Compliance

This flat washer adheres to standard inch measurements with an inner diameter of 0.156", outer diameter of 0.375", and thickness ranging from 0.068" to 0.088", designed specifically for No. 6 screw size applications. It meets industry standards for material hardness (Rockwell 15N85) and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated markets.