S-90295A221 0.344" ID x 0.625" OD ASME B18.22.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance due to nylon plastic construction, eliminating rust and reducing maintenance in harsh environments.
• Reliable performance across extreme temperatures, functioning seamlessly from -40°F to 300°F without degrading.
• Superior electrical insulation properties of nylon, preventing galvanic corrosion and short circuits in electrical assemblies.
• Excellent load distribution and surface protection with a precise 0.625" OD and 0.344" ID, minimizing stress on connected materials.
• High durability and wear resistance backed by Rockwell R115 hardness, ensuring long service life under vibration and load.
• Guaranteed dimensional consistency and interchangeability through compliance with the ASME B18.22.1 standard.
• Safe for regulated industries with full compliance to RoHS 3 and REACH environmental directives.

Professional Applications & Engineering Value

This nylon plastic flat washer is engineered to solve critical challenges in industrial and electronic applications where metal fasteners fail. Its non-conductive, corrosion-resistant properties make it ideal for electrical enclosures, marine equipment, and chemical processing assemblies, preventing galvanic corrosion and ensuring operational safety. The 5/16" screw size compatibility and robust Rockwell R115 hardness provide reliable vibration resistance and load distribution, protecting sensitive surfaces from damage. With a temperature range of -40°F to 300°F, it maintains integrity in extreme conditions, from freezer units to automotive engine compartments, reducing downtime and replacement costs. The bright green color aids in quick identification and inventory management, streamlining assembly processes.

Specification Summary & Compliance

This washer adheres to critical dimensional standards per ASME B18.22.1 for inch-system flat washers, ensuring precise fit with a 0.344" inner diameter (ID), 0.625" outer diameter (OD), and thickness of 0.056-0.071". It is manufactured from high-grade nylon plastic and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for global industrial use.