S-99041A145 0.375" ID Square Washers

Key Features & Benefits at a Glance

• Superior Load Distribution – The large 1.75" square surface area effectively spreads pressure, reducing stress on assemblies and preventing material damage.
• Enhanced Corrosion Resistance – Zinc-plated steel construction provides reliable protection against rust, extending service life in demanding environments.
• Consistent Mechanical Strength – With a Rockwell B40 hardness, this washer maintains dimensional stability and resists deformation under heavy loads.
• Precise Fit for 5/16" Screws – The 0.375" inner diameter ensures a secure fit, minimizing movement and improving joint integrity.
• Robust Thickness for Durability – A thickness range of 0.125" to 0.145" offers reliable performance and vibration resistance in industrial applications.
• Compliance with Global Standards – Meets RoHS 3 and REACH regulations, ensuring safe, environmentally responsible use in international markets.
• Versatile Inch System Compatibility – Designed to inch measurement standards, it integrates seamlessly with existing North American machinery and fastening systems.

Professional Applications & Engineering Value

This heavy-duty square washer is engineered to solve common industrial fastening challenges, such as surface indentation and joint loosening under dynamic loads. The zinc-plated steel material, combined with its substantial 1.75" width, provides a larger bearing surface that effectively distributes clamp load, protecting soft materials and reducing the risk of bolt pull-through. Its Rockwell B40 hardness ensures it can withstand high tensile and compressive forces without cracking or deforming, making it ideal for construction, machinery assembly, and automotive applications. The precise 0.375" ID is tailored for 5/16" screws, offering a snug fit that enhances vibration resistance and maintains alignment in structural connections. This washer delivers reliable performance in harsh conditions, supporting long-term operational safety and reducing maintenance frequency.

Specification Summary & Compliance

This square washer conforms to standard inch dimensional tolerances, with an inner diameter of 0.375", thickness between 0.125" and 0.145", and width of 1.75". It is manufactured from zinc-plated steel with a Rockwell B40 hardness rating, ensuring consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards for industrial components.