S-99041A105 0.375" ID Square Washers

Key Features & Benefits at a Glance

• Superior Load Distribution: The square shape and 0.875" width provide a larger surface area, effectively spreading the load and preventing surface damage or bolt pull-through in heavy-duty applications.
• Enhanced Corrosion Resistance: The zinc-plated steel construction offers reliable protection against rust and corrosion, extending the washer's service life in harsh industrial environments.
• Exceptional Mechanical Strength: With a Rockwell B40 hardness, this washer maintains its form and function under high stress and vibration, ensuring long-term joint integrity.
• Precision Fit for 5/16" Screws: The 0.375" inner diameter is engineered for a precise fit with 5/16" fasteners, minimizing play and improving assembly accuracy in inch-system projects.
• Robust and Durable Build: A thickness range of 0.120-0.140" provides substantial material strength, making it ideal for applications requiring a heavy-duty and reliable washer.
• Compliance with Global Standards: Meets RoHS 3 and REACH compliance, ensuring the washer is free from hazardous substances and suitable for use in regulated markets and sensitive applications.

Professional Applications & Engineering Value

This zinc-plated steel square washer is engineered to address common challenges in industrial assembly, such as joint loosening and surface indentation. Its square design offers greater stability and prevents rotation under torque, which is critical for maintaining bolt preload in structural frameworks, heavy machinery, and construction equipment. The 0.375" ID ensures a precise match for 5/16" screw sizes, reducing installation errors and enhancing the reliability of connections. Made from high-strength steel with a Rockwell B40 hardness, it withstands repetitive stress and environmental exposure, making it a dependable choice for automotive, manufacturing, and infrastructure projects where durability and compliance with RoHS and REACH standards are paramount.

Specification Summary & Compliance

This square washer features an inner diameter of 0.375", a width of 0.875", and a thickness range of 0.120-0.140", designed for use with 5/16" screws in inch measurement systems. It is manufactured from zinc-plated steel with a Rockwell B40 hardness, ensuring consistent performance and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for industrial use and adherence to environmental and health standards.