S-91755A144 0.375" ID x 0.593" OD Self-Retaining Washers

Self-Retaining Washers

1288FA00023 Self-Retaining Washers
1288FA00023 Self-Retaining Washers

Image may differ from product. See technical specification for details.

Part No.
Part No. 1288FA00023
Equivalent to mcmaster :
91755A144

Basic Information

System of Measurement Inch and Metric
Washer Type Self-Retaining

Dimension Parameters

ID 0.375"
OD 0.593"
Thickness 0.022-0.042"

Material & Strength Parameters

Material Nylon Plastic
Hardness Rockwell R120

Temperature & Environment Parameters

Temperature Range, °F Min. -40°
Temperature Range, °F Maximum 180°

Installation & Application Parameters

For Screw Size 1/4", M6

Finish & Compliance Parameters

RoHS RoHS 3 (2015/863/EU) Compliant
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Superior vibration resistance through self-retaining design, preventing loosening in dynamic applications
  • Excellent thermal stability with operating range from -40°F to 180°F for reliable performance in extreme environments
  • Optimal material hardness with Rockwell R120 nylon construction providing durable, long-lasting service life
  • Dual-system compatibility designed for both 1/4" and M6 screw sizes, supporting inch and metric applications
  • Precise dimensional fit with 0.375" ID and 0.593" OD ensuring secure fastening and proper alignment
  • Environmental compliance meeting RoHS 3 (2015/863/EU) standards for safe, regulated usage
  • Corrosion-free performance thanks to nylon plastic material, eliminating rust concerns in various conditions

Professional Applications & Engineering Value

This nylon self-retaining washer delivers critical engineering solutions where vibration resistance and thermal stability are paramount. The Rockwell R120 hardness nylon plastic construction maintains structural integrity while the self-retaining feature prevents walk-off in high-vibration environments like automotive assemblies, machinery, and electrical enclosures. With an operating range of -40°F to 180°F, it performs reliably in both freezing and elevated temperature conditions where metal washers might fail. The dual-size compatibility for 1/4" and M6 screws makes it ideal for equipment requiring both inch and metric fastening systems, while the precise 0.375" ID and 0.593" OD dimensions ensure consistent seating and load distribution.

Specification Summary & Compliance

This washer features precise dimensional specifications including 0.375" internal diameter, 0.593" outer diameter, and thickness ranging from 0.022" to 0.042". Manufactured from nylon plastic with Rockwell R120 hardness rating, it is engineered for 1/4" and M6 screw applications in both inch and metric systems. The product is fully RoHS 3 (2015/863/EU) compliant and operates effectively across a temperature range of -40°F to 180°F, ensuring regulatory adherence and performance reliability in industrial settings.

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