S-93550A120 1.875" ID x 3.375" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide steel finish, extending service life in humid or harsh industrial environments
• Precise dimensional fit with 1.875" ID and 3.375" OD, ensuring reliable load distribution for 1 3/4" screw assemblies
• Enhanced durability and surface protection due to the robust steel construction, minimizing wear and deformation under pressure
• Consistent thickness tolerance (0.235-0.265") for uniform clamping force and improved joint integrity
• Compliance with international environmental standards, including RoHS 3 and REACH, ensuring safe and sustainable use in regulated industries
• Broad compatibility with inch-system fasteners, simplifying sourcing and installation in North American machinery and equipment
• Cost-effective reliability for heavy-duty applications, reducing maintenance needs and replacement frequency

Professional Applications & Engineering Value

This black-oxide steel flat washer is engineered to address common industrial challenges such as fastener loosening, surface abrasion, and corrosion-induced failure. The black-oxide coating provides a protective barrier against moisture and chemicals, making it ideal for outdoor equipment, automotive assemblies, and machinery exposed to demanding conditions. Its precise 1.875" inner diameter and 3.375" outer diameter ensure optimal load distribution, preventing stress concentration on connected components. By utilizing inch-system dimensions and a standardized flat washer design, it streamlines maintenance and reduces downtime in construction, manufacturing, and heavy equipment sectors where reliability is critical.

Specification Summary & Compliance

This washer adheres to standard inch-system tolerances with an inner diameter of 1.875", outer diameter of 3.375", and thickness range of 0.235-0.265", specifically designed for use with 1 3/4" screws. It is manufactured from high-quality steel with a black-oxide surface treatment for enhanced performance. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and meets REACH (EC 1907/2006) requirements as of January 17, 2023, ensuring environmental and safety standards are upheld for industrial applications.