S-91755A155 0.236" ID x 0.39" OD Self-Retaining Washers
Self-Retaining Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Temperature & Environment Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Secure self-retaining design prevents loosening under vibration, reducing maintenance needs in dynamic applications.
- Excellent temperature resistance from -40°F to 180°F ensures reliable performance in both extreme cold and moderate heat environments.
- High Rockwell R120 hardness provides superior durability and wear resistance for extended service life.
- Dual compatibility with both No. 8 (inch) and M4 (metric) screw sizes offers versatile installation options.
- Corrosion-free nylon plastic construction eliminates rust and galvanic corrosion, ideal for electrical and chemical exposure.
- RoHS 3 compliance meets stringent environmental regulations for safe use in consumer and industrial products.
- Precise dimensional control with consistent ID, OD, and thickness ensures proper fit and uniform clamping force.
Professional Applications & Engineering Value
This nylon plastic self-retaining washer delivers critical engineering solutions where metal fasteners fail. Its non-conductive and non-magnetic properties make it ideal for electrical enclosures, automotive electronics, and precision instrumentation, preventing short circuits and signal interference. The self-retaining feature eliminates the need for additional locking mechanisms, speeding up assembly in automated production lines while maintaining secure fastening under continuous vibration. With a broad temperature range from -40°F to 180°F, it performs reliably in outdoor equipment, HVAC systems, and automotive components exposed to seasonal extremes. The Rockwell R120 hardness ensures it withstands repeated compression cycles without deformation, providing long-term reliability in high-cycle applications.
Specification Summary & Compliance
This washer features precise dimensions: 0.236" ID, 0.39" OD, and 0.052-0.072" thickness, compatible with No. 8 (inch) and M4 (metric) screw sizes. Manufactured from nylon plastic with Rockwell R120 hardness, it maintains dimensional stability across its specified temperature range of -40°F to 180°F. The product is fully RoHS 3 (2015/863/EU) compliant, meeting international environmental standards for hazardous substance restrictions.
