S-91128A100 0.5" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced Load Distribution: Square shape with 2" width provides superior surface contact, reducing surface pressure and preventing material damage in heavy-duty applications.
• Superior Corrosion Resistance: Black-oxide steel finish offers reliable protection against rust and environmental wear, extending component lifespan in harsh industrial settings.
• Precision Fit for 7/16" Screws: 0.5" inner diameter ensures accurate alignment and secure fastening, minimizing installation errors and vibration-induced loosening.
• Exceptional Mechanical Strength: Rockwell 15N80 hardness rating guarantees high durability and resistance to deformation under extreme mechanical stress.
• Consistent Performance Thickness: Controlled 0.235-0.265" thickness maintains uniform pressure distribution and clamping force across assemblies.
• Global Compliance Assurance: Meets RoHS 3 and REACH environmental standards, ensuring safe use in regulated markets and sustainable manufacturing practices.
• Optimized for Inch-System Applications: Designed specifically for imperial measurement environments, providing seamless compatibility with existing industrial equipment and standards.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these square washers solve critical engineering challenges in construction, heavy machinery, and structural assemblies. The black-oxide steel material provides essential corrosion protection where moisture or chemical exposure occurs, while the square configuration delivers maximum bearing surface to prevent sinkage into soft materials or distortion under high torque loads. With precise 0.5" ID matching 7/16" screw sizes, these washers eliminate misalignment issues in bolted connections, ensuring reliable performance in vibration-prone environments. The Rockwell 15N80 hardness maintains dimensional stability under repeated stress cycles, making them ideal for permanent installations where disassembly is impractical.

Specification Summary & Compliance

This square washer features inch-system dimensions including 0.5" inner diameter, 2" width, and 0.235-0.265" thickness range. Manufactured from black-oxide steel with Rockwell 15N80 hardness rating, it complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as steel alloying element and REACH (EC 1907/2006) standards updated to January 2023 SVHC list. Designed specifically for 7/16" screw applications, these washers meet industrial fastening specifications for dimensional accuracy and material performance.