S-90339A201 Easy-Install Slotted Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel finish, ideal for humid or demanding industrial environments.
• Precise slot compatibility with a 1/8" slot width and 1/4" slot depth, ensuring secure tool engagement and easy installation.
• Optimized dimensional stability featuring a 0.313" OD and controlled thickness (0.027-0.033") for consistent performance with No. 4 screws.
• Superior mechanical strength from Rockwell B40 hardness, providing reliable load distribution and resistance to deformation.
• Broad industrial applicability as an inch-system washer, suitable for machinery, electronics, and assembly lines requiring durable fastening.
• Regulatory compliance assurance meeting RoHS 3 and REACH standards, supporting global supply chain and environmental safety requirements.
• Long-term operational reliability due to robust material and construction, minimizing maintenance needs in high-vibration applications.

Professional Applications & Engineering Value

This slotted washer is engineered from black-oxide steel to address common industrial challenges such as fastener loosening and corrosion-induced failures. The precise 0.313" OD and 1/8" slot width ensure accurate alignment and secure locking with No. 4 screws, critical in assemblies subjected to dynamic loads. Its Rockwell B40 hardness enhances durability, distributing stress evenly to prevent surface damage and extend service life in machinery, automotive, and electronic enclosures. By integrating a compliant inch-system design, it streamlines maintenance and reduces downtime in production lines, offering a reliable fastening solution that meets rigorous engineering standards.

Specification Summary & Compliance

This washer adheres to inch-based dimensional standards with an OD of 0.313", thickness range of 0.027-0.033", slot width of 1/8", and slot depth of 1/4", ensuring precise fit for No. 4 screw sizes. Manufactured from black-oxide steel with a Rockwell B40 hardness, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and safety-critical industrial applications.