S-91128A151 0.219" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel coating for longer service life in harsh industrial environments
• Superior load distribution thanks to the 2" square design that prevents fastener embedment in soft materials
• Precise No. 10 screw compatibility with 0.219" ID ensuring secure fit and reduced vibration loosening
• Consistent performance maintained through Rockwell B40 hardness rating for reliable mechanical properties
• Regulatory compliance assurance with full RoHS 3 and REACH compliance for global industrial applications
• Optimized thickness tolerance (0.054-0.066") providing uniform pressure distribution across mating surfaces
• Dimensional stability in inch measurement system ensuring compatibility with North American industrial standards

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide steel square washers solve critical fastening challenges in construction, machinery assembly, and structural frameworks. The 2" square configuration provides significantly larger surface contact area compared to round washers, effectively preventing pull-through in wood, composite, and soft metal applications. The black-oxide surface treatment offers superior corrosion resistance without significantly altering dimensional tolerances, making these industrial washers ideal for outdoor equipment, agricultural machinery, and structural steel connections where environmental exposure is a concern. The precise 0.219" ID ensures perfect alignment with No. 10 screws, eliminating play and maintaining joint integrity under dynamic loads and vibration.

Specification Summary & Compliance

This square washer features inch system dimensions with 2" width, 0.219" inner diameter, and controlled thickness between 0.054-0.066". Manufactured from black-oxide steel with Rockwell B40 hardness rating, the product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, including the latest SVHC updates as of June 14, 2023. Designed specifically for No. 10 screw size applications, these industrial grade washers meet rigorous quality standards for construction and heavy machinery fastening requirements.