S-91755A133 0.218" ID x 0.453" OD Self-Retaining Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through self-retaining design, preventing loosening in dynamic applications
• Excellent thermal stability with reliable performance across extreme temperatures from -40°F to 180°F
• Optimal material durability with Rockwell R120 hardness nylon plastic for long-lasting wear resistance
• Dual compatibility with both No. 8 (inch) and M4 (metric) screw sizes for versatile application use
• Precision dimensional fit with 0.218" ID and 0.453" OD ensuring consistent installation performance
• Environmental compliance with RoHS 3 standards for safe use in regulated industries
• Non-conductive and corrosion-resistant nylon construction for electrical insulation and harsh environment protection

Professional Applications & Engineering Value

This nylon self-retaining washer delivers critical engineering solutions where vibration resistance and thermal stability are paramount. The Rockwell R120 hardness provides exceptional durability against wear in high-cycle applications, while the self-retaining feature eliminates the need for additional locking mechanisms, reducing assembly time and costs. The nylon plastic material offers excellent electrical insulation properties and corrosion resistance, making it ideal for electrical enclosures, automotive assemblies, and outdoor equipment. With dual compatibility for both No. 8 and M4 screw sizes, this washer streamlines inventory management for operations using mixed measurement systems. The broad temperature range from -40°F to 180°F ensures reliable performance in both freezing outdoor conditions and elevated temperature industrial environments.

Specification Summary & Compliance

This washer features precise dimensional specifications with 0.218" inner diameter, 0.453" outer diameter, and thickness ranging from 0.035" to 0.055". Manufactured from high-grade nylon plastic with Rockwell R120 hardness, it maintains dimensional stability across its operating range. The product is fully RoHS 3 (2015/863/EU) compliant and designed to meet industrial fastener standards for both inch (No. 8) and metric (M4) screw compatibility. The thermal performance rating of -40°F to 180°F ensures reliability in diverse environmental conditions.