S-90295A254 0.348" ID x 1.5" OD ASME B18.22.1 Plastic Washers

Key Features & Benefits at a Glance

• Exceptional temperature resistance maintains structural integrity and performance in extreme environments from -40°F to 300°F
• Superior electrical insulation properties of nylon plastic prevent galvanic corrosion and current leakage in sensitive assemblies
• Rockwell R115 hardness rating provides excellent surface durability and resistance to deformation under load
• Precise dimensional compliance with ASME B18.22.1 standards ensures perfect fit for 5/16" screw applications
• Environmental regulation compliance with RoHS 3 and REACH standards eliminates hazardous substance concerns
• Vibration dampening characteristics reduce noise and prevent fastener loosening in dynamic applications
• Color-coded green identification enables quick visual verification and inventory management efficiency

Professional Applications & Engineering Value

This nylon flat washer delivers critical engineering solutions where metal washers fail. The nylon plastic construction provides inherent corrosion resistance, making it ideal for harsh chemical environments, marine applications, and outdoor installations. Its electrical insulation properties prevent short circuits in electrical enclosures and electronic assemblies, while the temperature range from -40°F to 300°F ensures reliable performance in automotive underhood applications, HVAC systems, and industrial equipment exposed to thermal cycling. The 1.5" OD provides optimal load distribution for 5/16" fasteners, preventing surface damage and maintaining joint integrity in plastic, composite, and soft metal substrates where traditional metal washers could cause deformation or stress cracking.

Specification Summary & Compliance

This flat washer features precise dimensional specifications with 0.348" ID and 1.5" OD with thickness ranging from 0.047" to 0.080", engineered specifically for 5/16" screw applications. Manufactured to ASME B18.22.1 standards for dimensional accuracy and performance consistency. The washer is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) requirements regarding substance restrictions. Material certification includes Rockwell R115 hardness testing and validation for the specified temperature range of -40°F to 300°F operational capability.