S-91755A153 0.156" ID x 0.265" OD Self-Retaining Washers

Key Features & Benefits at a Glance

• Secure self-retaining design eliminates loosening under vibration, reducing maintenance needs and improving assembly reliability
• Excellent thermal stability with -40°F to 180°F operating range ensures consistent performance in extreme temperature environments
• Superior chemical resistance of nylon plastic protects against corrosion and degradation in harsh industrial settings
• Reliable electrical insulation properties prevent current leakage and short circuits in electrical applications
• Rockwell R120 hardness provides durable wear resistance while maintaining flexibility for repeated use
• Dual-system compatibility with both inch (No. 4) and metric (M3) screw sizes simplifies inventory management for global operations
• RoHS 3 compliance ensures environmental responsibility and meets international regulatory standards

Professional Applications & Engineering Value

This nylon plastic self-retaining washer delivers critical engineering solutions where traditional metal washers fail. The self-retaining feature maintains positional stability during assembly, preventing misalignment in automated production lines while reducing installation time. The nylon material provides inherent chemical resistance against oils, solvents, and mild acids, making it ideal for automotive, electronics, and machinery applications where corrosion resistance is paramount. The thermal stability from -40°F to 180°F ensures reliable performance in both freezing outdoor environments and heated industrial equipment. As an electrical insulation washer, it prevents galvanic corrosion between dissimilar metals and protects sensitive electronic components from short circuits. The combination of Rockwell R120 hardness and precise dimensional control (0.156" ID, 0.265" OD) ensures consistent performance in high-vibration applications while accommodating both No. 4 and M3 screw sizes for global manufacturing flexibility.

Specification Summary & Compliance

This precision-engineered washer features dimensional accuracy with 0.156" inner diameter and 0.265" outer diameter, manufactured to tight thickness tolerances between 0.022-0.042". The component meets standard fit requirements for both No. 4 inch screws and M3 metric screws, providing cross-system compatibility. Material specifications include Nylon Plastic with Rockwell R120 hardness for optimal mechanical properties. The washer is fully RoHS 3 (2015/863/EU) compliant, containing no restricted hazardous substances, and operates reliably across the specified temperature range from -40°F to 180°F without performance degradation.