S-91755A143 0.344" ID x 0.5" OD Self-Retaining Washers

Key Features & Benefits at a Glance

• Secure self-retaining design prevents loosening under vibration, reducing maintenance needs and improving assembly reliability.
• Excellent temperature resistance from -40°F to 180°F ensures stable performance in diverse industrial environments.
• High Rockwell R120 hardness provides superior durability and wear resistance for long-lasting service life.
• RoHS 3 (2015/863/EU) compliance guarantees environmental safety and meets international regulatory standards.
• Dual-inch and metric compatibility for 1/4" and M6 screw sizes offers versatile application across global equipment standards.
• Precision dimensions (0.344" ID, 0.5" OD) ensure consistent fit and optimal load distribution in fastened joints.
• Non-conductive nylon material eliminates electrical conductivity risks and prevents galvanic corrosion.

Professional Applications & Engineering Value

This nylon self-retaining washer is engineered to address critical challenges in industrial assembly, where vibration-induced loosening and environmental factors compromise fastener integrity. The self-retaining feature locks securely onto 1/4" or M6 screws, maintaining clamp load in high-vibration applications like automotive, electronics, and machinery. Made from high-grade nylon plastic, it offers excellent chemical resistance and operates reliably across a broad temperature range from -40°F to 180°F, making it ideal for outdoor or thermally variable settings. Its Rockwell R120 hardness ensures it withstands repeated stress without deformation, while the precise inner and outer diameters (0.344" ID, 0.5" OD) provide consistent seating and uniform pressure distribution, preventing damage to sensitive components. This combination of material properties and design delivers enhanced safety, reduced downtime, and compliance with RoHS 3 environmental standards.

Specification Summary & Compliance

This washer meets precise dimensional requirements with an ID of 0.344", OD of 0.5", and thickness ranging from 0.022" to 0.042", ensuring accurate fit for 1/4" and M6 screw applications. Manufactured from nylon plastic with a Rockwell R120 hardness, it adheres to standard inch and metric system specifications. The product is fully RoHS 3 (2015/863/EU) compliant, confirming it is free of hazardous substances, and is designed for reliable operation within a temperature range of -40°F to 180°F, supporting use in regulated industrial environments.