S-93852A178 0.812" ID x 2" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel, ideal for harsh industrial environments and outdoor applications.
• Exceptional load distribution with a large 2" outer diameter, minimizing surface pressure and preventing material damage.
• Enhanced durability and wear resistance due to Rockwell B68 hardness, ensuring long service life under heavy loads.
• Precise fit for 3/4" fasteners with a 0.812" inner diameter, providing secure and reliable assembly.
• Compliance with ASME B18.21.1 standard, guaranteeing dimensional accuracy and interchangeability for engineering projects.
• Environmental and safety compliance with RoHS 3 and REACH, making it safe for regulated industries.
• Versatile industrial application in construction, machinery, and marine settings due to its robust material and finish.

Professional Applications & Engineering Value

This USS flat washer is engineered to address common industrial challenges such as fastener loosening, surface damage, and corrosion-induced failure. The Black-Oxide finish on 18-8 Stainless Steel provides an added layer of protection against rust and chemical exposure, making it suitable for demanding environments like marine, chemical processing, and outdoor construction. Its substantial 2" OD ensures even load distribution, reducing stress concentrations on connected materials and preventing deformation. With a Rockwell B68 hardness, it maintains structural integrity under vibration and heavy loads, offering reliable performance in heavy-duty applications such as structural bolting, machinery assembly, and infrastructure projects. This washer’s precise dimensions and ASME B18.21.1 compliance ensure seamless integration with standard 3/4" inch-system fasteners, streamlining procurement and installation for engineers and procurement specialists.

Specification Summary & Compliance

This washer meets ASME B18.21.1 specifications for dimensional accuracy, including an inner diameter of 0.812", outer diameter of 2", and thickness ranging from 0.122" to 0.177". It is manufactured from 18-8 Stainless Steel with a Black-Oxide surface treatment and hardness of Rockwell B68. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for industrial use.