S-91434A128 1.875" ID x 3.375" OD ASME B18.21.1 SAE Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black protective coating for extended service life in harsh industrial environments
• Superior load distribution with large 3.375" outer diameter providing optimal surface coverage and pressure dispersion
• High-strength Grade 8 performance ensuring reliable performance under heavy loads and vibration conditions
• Precise 1.875" inner diameter designed for perfect fit with 1 3/4" screw sizes, eliminating installation issues
• Enhanced durability with Rockwell C38 hardness rating for superior wear resistance and long-term reliability
• Industry-standard compliance meeting ASME B18.21.1 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated applications

Professional Applications & Engineering Value

This Grade 8 SAE flat washer delivers critical engineering solutions for demanding industrial applications where corrosion resistance and structural integrity are paramount. The black corrosion-resistant coated steel construction provides superior protection against environmental degradation, making it ideal for outdoor equipment, marine applications, and chemical processing facilities. With its heavy-duty design and precise dimensional specifications, this washer effectively prevents bolt loosening under vibration, distributes clamping forces evenly across joined surfaces, and extends the service life of fastened assemblies. The combination of Rockwell C38 hardness and ASME B18.21.1 compliance ensures consistent performance in high-stress applications including structural steel connections, heavy machinery, and industrial equipment maintenance where reliability cannot be compromised.

Specification Summary & Compliance

This heavy-duty flat washer features precise dimensional specifications with 1.875" inner diameter, 3.375" outer diameter, and thickness ranging from 0.178" to 0.196" for optimal performance with 1 3/4" screw sizes. Manufactured to ASME B18.21.1 standards for dimensional accuracy and mechanical properties, the washer maintains Grade 8 strength classification with Rockwell C38 hardness rating. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while meeting international quality and safety standards.