S-93852A183 1.375" ID x 3" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance thanks to 18-8 stainless steel with a protective black-oxide finish, ideal for harsh industrial environments.
• Superior durability and deformation resistance provided by a Rockwell B68 hardness rating, ensuring long-term performance under load.
• Optimal load distribution and surface protection with a large 3" outer diameter, preventing damage to assembled materials.
• Precise fit for 1 1/4" screws with a 1.375" inner diameter, ensuring secure and stable fastening in USS applications.
• Guaranteed dimensional consistency and interchangeability through compliance with the rigorous ASME B18.21.1 standard.
• Enhanced reliability in demanding applications due to a robust thickness range of 0.136" to 0.192".
• Safe for use in regulated markets as it is fully compliant with RoHS 3 and REACH environmental directives.

Professional Applications & Engineering Value

This USS flat washer is engineered to solve critical challenges in heavy-duty industrial applications. The core value lies in its black-oxide 18-8 stainless steel construction, which provides a formidable barrier against rust and chemical corrosion, significantly extending the service life of assemblies in outdoor, marine, or chemically aggressive settings. The large OD and robust thickness work in tandem to distribute clamping force over a wider area, effectively preventing joint loosening, material embedment, and surface damage under high vibrational or dynamic loads. This makes it an indispensable component for structural steelwork, heavy machinery, and large-scale construction projects where reliable load distribution and long-term corrosion resistance are non-negotiable for safety and maintenance schedules.

Specification Summary & Compliance

This washer conforms to the dimensional and mechanical requirements of the ASME B18.21.1 standard for Type A Plain Washers. Key specifications include an Inner Diameter (ID) of 1.375", an Outer Diameter (OD) of 3", and a Thickness ranging from 0.136" to 0.192", designed for use with a 1 1/4" screw. The product is manufactured from 18-8 Stainless Steel with a black-oxide surface treatment and a hardness of Rockwell B68. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.