S-91755A315 0.169" ID x 0.472" OD Self-Retaining Washers

Key Features & Benefits at a Glance

• Self-retaining design ensures secure positioning during assembly, reducing installation time and preventing misalignment in high-vibration environments.
• Nylon construction offers excellent corrosion resistance, electrical insulation, and lightweight properties, ideal for sensitive or corrosive industrial settings.
• Wide temperature tolerance from -40°F to 180°F maintains performance and dimensional stability in extreme thermal conditions without cracking or deforming.
• Rockwell R120 hardness provides reliable durability and wear resistance, extending service life in repetitive fastening applications.
• Dual screw compatibility with No. 8 (inch) and M4 (metric) sizes offers versatility for global equipment designs and reduces inventory needs.
• RoHS 3 compliance ensures environmental safety and meets international regulatory standards for hazardous substance restrictions.
• Precise dimensional control with 0.169" ID and 0.472" OD guarantees consistent fit and effective load distribution for No. 8 and M4 screws.

Professional Applications & Engineering Value

This nylon self-retaining washer is engineered to address common challenges in industrial assembly, such as component loosening due to vibration and thermal expansion. The off-white nylon plastic material provides inherent resistance to chemicals, moisture, and electrical conductivity, making it suitable for electrical enclosures, automotive subsystems, and machinery where metal fasteners could cause galvanic corrosion or short circuits. Its self-retaining feature allows for hands-free installation, streamlining production lines and reducing labor costs. With a temperature range of -40°F to 180°F, it performs reliably in both freezing outdoor equipment and heated industrial devices, ensuring long-term vibration resistance and minimal maintenance. The compatibility with No. 8 and M4 screw sizes supports versatile applications across inch and metric systems, enhancing procurement efficiency for global engineering projects.

Specification Summary & Compliance

This washer meets precise dimensional standards with an ID of 0.169", OD of 0.472", and thickness ranging from 0.049" to 0.061", ensuring consistent fit for No. 8 and M4 screws. Manufactured from nylon plastic with a Rockwell R120 hardness, it adheres to industry requirements for durability and performance. The product is RoHS 3 (2015/863/EU) compliant, confirming it is free from restricted hazardous substances, and operates effectively within a temperature range of -40°F to 180°F, suitable for various industrial and environmental conditions.