S-91755A139 0.277" ID x 0.4" OD Self-Retaining Washers

Key Features & Benefits at a Glance

• Superior vibration resistance ensures secure, long-lasting fastening in high-motion applications
• Exceptional temperature tolerance from -40°F to 180°F maintains performance in extreme thermal environments
• Durable nylon construction with Rockwell R120 hardness provides excellent wear and chemical resistance
• Self-retaining design simplifies installation and prevents washer displacement during assembly
• Dual-standard compatibility fits both No. 10 (inch) and M5 (metric) screw sizes for versatile applications
• RoHS 3 compliant material meets environmental regulations for safe industrial use
• Precise dimensional control with 0.277" ID and 0.4" OD ensures consistent fit and function

Professional Applications & Engineering Value

This nylon self-retaining washer delivers critical engineering solutions where traditional washers fail. The plastic washer construction eliminates galvanic corrosion concerns when used with dissimilar metals while providing excellent electrical insulation. Its self-retaining capability addresses assembly line efficiency challenges by staying in position during automated or manual installation processes. The exceptional temperature range from -40°F to 180°F makes it ideal for automotive, electronics, and outdoor equipment applications where thermal cycling would compromise ordinary washers. The vibration-resistant properties prevent loosening in machinery and moving assemblies, reducing maintenance frequency and improving operational safety. Compatible with both No. 10 and M5 screw sizes, this washer streamlines inventory for manufacturers working with multiple measurement systems.

Specification Summary & Compliance

This washer features precise dimensional specifications with 0.277" internal diameter, 0.4" outer diameter, and thickness ranging from 0.045" to 0.065". Manufactured from nylon plastic with Rockwell R120 hardness rating, it provides consistent mechanical properties across its operating range. The product is fully RoHS 3 (2015/863/EU) compliant and suitable for applications requiring environmental regulation adherence. The dual-standard design accommodates both inch (No. 10) and metric (M5) fastener systems, offering flexibility in global manufacturing environments.