S-91755A131 0.375" ID x 0.75" OD Self-Retaining Washers

Key Features & Benefits at a Glance

• Superior vibration resistance ensures fasteners remain securely locked in position, reducing maintenance needs and preventing loosening in dynamic environments.
• Excellent temperature stability from -40°F to 180°F maintains performance and dimensional integrity in both extreme cold and moderate heat applications.
• High durability with Rockwell R120 hardness provides long-lasting wear resistance, extending service life in high-frequency assembly and disassembly cycles.
• Self-retaining design simplifies installation by holding the washer in place on the screw, speeding up assembly processes and reducing labor time.
• RoHS 3 compliance guarantees environmentally safe manufacturing, meeting strict international regulations for hazardous substance restrictions.
• Precise dimensional fit with 0.375" ID and 0.75" OD ensures optimal alignment and consistent clamping force for No. 7 screw sizes.
• Nylon material construction offers excellent corrosion resistance, electrical insulation, and lightweight properties ideal for sensitive mechanical assemblies.

Professional Applications & Engineering Value

This nylon self-retaining washer addresses critical challenges in mechanical fastening by combining vibration resistance with thermal stability. Engineered for No. 7 screw sizes in inch system applications, its self-retaining feature eliminates misalignment during assembly, ensuring consistent clamping force in automated production lines. The nylon plastic material provides inherent corrosion resistance, making it suitable for harsh environments where metal washers would degrade. With a temperature range of -40°F to 180°F, it performs reliably in outdoor equipment, automotive subsystems, and electronic enclosures, preventing fastener failure due to thermal expansion or contraction. This washer is ideal for maintaining joint integrity in industrial washers and plastic fasteners applications where reliability is paramount.

Specification Summary & Compliance

This washer features an ID of 0.375", OD of 0.75", and thickness range of 0.052-0.072", designed specifically for No. 7 screw size in the inch system. It complies with RoHS 3 (2015/863/EU) standards, ensuring no hazardous substances are used. The Rockwell R120 hardness confirms consistent material properties for reliable performance in mechanical assemblies.