S-91755A122 0.331" ID x 0.669" OD Self-Retaining Washers

Key Features & Benefits at a Glance

• Superior vibration resistance due to the self-retaining design, ensuring screws remain securely fastened in high-motion applications
• Excellent chemical and corrosion resistance from polyethylene plastic construction, ideal for harsh industrial environments
• Broad temperature tolerance from 35°F to 145°F, maintaining performance in varying operational conditions
• Dual compatibility with both 5/16" and M8 screw sizes, offering flexibility for inch and metric fastening systems
• Consistent dimensional stability with precise 0.331" ID and 0.669" OD, providing reliable fit and reduced assembly errors
• Durable material integrity with Durometer 43D hardness, balancing flexibility and wear resistance for long service life
• Environmental compliance assurance with RoHS 3 (2015/863/EU) adherence, meeting global regulatory standards for safe usage

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these polyethylene self-retaining washers address critical challenges in machinery assembly, automotive components, and outdoor equipment. The polyethylene plastic material inherently resists moisture, chemicals, and UV degradation, preventing premature failure in corrosive or variable climates. With a self-retaining feature, the washer locks firmly onto 5/16" or M8 screws, eliminating loosening from vibrations—common in motors, conveyors, and structural frameworks. This design reduces maintenance frequency and enhances safety in vibration-prone applications, while the temperature resistance ensures reliability from cool storage to heated operational zones. Ideal for OEMs and MRO suppliers, these washers streamline inventory by serving both inch and metric systems, cutting downtime and procurement costs.

Specification Summary & Compliance

This washer meets precise dimensional standards with an ID of 0.331", OD of 0.669", and thickness ranging 0.073–0.085", ensuring consistent performance in Class 2A and comparable metric tolerances. Manufactured from polyethylene plastic with a Durometer 43D hardness, it complies with RoHS 3 (2015/863/EU) regulations, confirming the absence of hazardous substances. The product is suitable for screw sizes 5/16" and M8, adhering to common industrial fastening specifications for reliable integration across diverse assemblies.