S-91755A121 0.252" ID x 0.472" OD Self-Retaining Washers

Key Features & Benefits at a Glance

• Superior chemical and moisture resistance from polyethylene plastic construction for long-lasting performance in harsh environments
• Secure self-retaining design ensures proper positioning during assembly, reducing installation time and preventing misalignment
• Broad temperature resilience from 35°F to 145°F maintains structural integrity and functionality in varying thermal conditions
• Durable 43D Durometer hardness provides excellent impact resistance and load distribution without damaging mating surfaces
• Dual-standard compatibility with both 1/4" and M6 screw sizes offers flexibility for inch and metric fastener systems
• Precision dimensional control with 0.252" ID and 0.472" OD ensures consistent fit and reliable sealing performance
• Environmentally responsible manufacturing with full RoHS 3 compliance for safe use in regulated industries

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these polyethylene plastic self-retaining washers solve critical assembly challenges where thermal stability and chemical resistance are paramount. The unique self-retaining feature eliminates fastener migration in vibration-prone environments commonly found in automotive subsystems, electrical enclosures, and outdoor equipment. With a temperature range of -145°F to +145°F, they maintain dimensional stability in both freezing conditions and elevated temperatures where metal washers might corrode or conduct electricity. The Durometer 43D hardness provides optimal cushioning while preventing galvanic corrosion between dissimilar metals, making them ideal for electrical insulation applications and corrosion-sensitive assemblies. Their dual compatibility with both 1/4" and M6 screw sizes streamlines inventory management for operations using mixed measurement systems.

Specification Summary & Compliance

This precision self-retaining washer features critical dimensions of 0.252" ID and 0.472" OD with thickness ranging 0.057-0.069", engineered to exacting manufacturing tolerances. The component is fully compliant with RoHS 3 (2015/863/EU) environmental directives and manufactured from high-grade polyethylene plastic meeting industrial fastener specifications. The washer maintains consistent performance across its specified temperature range from 35°F to 145°F while providing reliable service in both inch (1/4") and metric (M6) fastener systems.