S-99041A146 0.438" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced Load Distribution – Square shape provides superior surface contact compared to round washers, reducing surface pressure and preventing material damage in heavy-duty applications.
• Superior Corrosion Resistance – Zinc-plated steel construction offers reliable protection against rust and environmental degradation, extending component lifespan in harsh industrial settings.
• Precision Fit for 3/8" Screws – 0.438" inner diameter ensures secure, wobble-free installation, maintaining assembly integrity and reducing the risk of loosening under vibration.
• Exceptional Mechanical Strength – Rockwell B40 hardness guarantees consistent performance under high stress, resisting deformation and maintaining clamping force over time.
• Optimized Thickness for Stability – 0.115-0.135" thickness range provides ideal balance between flexibility and rigidity, accommodating minor surface irregularities without compromising load-bearing capacity.
• Regulatory Compliance Assurance – Meets RoHS 3 (2015/863/EU) and REACH standards, ensuring safe use in regulated industries and global market accessibility.
• Broad Industrial Compatibility – 1.5" width delivers substantial bearing surface for various applications, from construction to machinery assembly, enhancing versatility across multiple sectors.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this square washer addresses critical challenges in heavy machinery, structural steelwork, and equipment manufacturing. The zinc-plated steel material provides essential corrosion resistance where moisture, chemicals, or outdoor exposure would compromise ordinary fasteners. Unlike round washers that can rotate during torque application, the square design remains stable under vibration, maintaining consistent clamping force in 3/8" screw assemblies. The substantial 1.5" width distributes loads effectively across softer materials like wood or composite surfaces, preventing embedment and surface damage. With precise dimensional control (0.438" ID, 0.115-0.135" thickness), these industrial washers ensure reliable performance in construction frameworks, agricultural equipment, and manufacturing jigs where vibration resistance and long-term durability are paramount.

Specification Summary & Compliance

This square washer features inch system dimensions with 1.5" width, 0.438" inner diameter, and 0.115-0.135" thickness range, manufactured to standard industrial tolerances for consistent fit. The component meets Rockwell B40 hardness specifications for mechanical reliability and carries full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations regarding hazardous substance restrictions. Designed specifically for 3/8" screw size applications, it maintains dimensional accuracy across production batches for interchangeable use in assembly operations.