S-99091A546 1/4"-20 x 1 1/2" Plastic Hex Head Screws

Plastic Hex Head Screws

0251FA00256 Plastic Hex Head Screws
0251FA00256 Plastic Hex Head Screws

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

Part No.
Part No. 0251FA00256
Equivalent to mcmaster :
99091A546

Basic Information

Color Black
System of Measurement Inch

Head Parameters

Head Type Hex
Head Width 3/8"
Head Height 3/16"

Dimensions

Length 1 1/2"

Thread Parameters

Thread Type UNC
Thread Size 1/4"-20
Thread Diameter 0.25"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 2A
Threading Fully Threaded

Tip & Drive Parameters

Drive Style External Hex

Material & Strength

Material Nylon Plastic
Hardness Not Rated

Temperature & Environment

Temperature Range -40° to 185° F
RoHS Compliant
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
Price available upon request. Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
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Key Features & Benefits at a Glance

  • Superior corrosion resistance from nylon construction eliminates rust and degradation in harsh environments
  • Excellent electrical insulation properties prevent current conduction for safer electrical applications
  • Wide temperature tolerance from -40° to 185°F ensures reliable performance across diverse operating conditions
  • External hex drive design provides maximum torque application and secure fastening with standard tools
  • UNC coarse threading delivers faster installation and superior holding power in plastic and soft materials
  • Class 2A thread fit guarantees precise dimensional accuracy and consistent performance
  • RoHS 3 compliance ensures environmental safety and regulatory adherence for global applications

Professional Applications & Engineering Value

These nylon hex head screws solve critical engineering challenges where metal fasteners fail. The black nylon plastic construction provides inherent corrosion resistance, eliminating galvanic corrosion and making them ideal for marine, chemical, and outdoor applications. Their non-conductive properties prevent electrical shorts in electrical enclosures, control panels, and electronic assemblies. The UNC coarse thread pattern combined with external hex drive ensures rapid installation and maximum torque transfer without stripping, while the fully threaded design offers consistent clamping force along the entire 1-1/2" length. These features make them particularly valuable in industries requiring electrical insulation and chemical resistance without compromising mechanical performance.

Specification Summary & Compliance

This 1/4"-20 x 1-1/2" nylon hex head screw features UNC coarse threads with Class 2A thread fit for precise dimensional accuracy and reliable engagement. The right-hand threading and external hex drive (3/8" head width) comply with standard industrial specifications. Manufactured from high-quality nylon plastic, these fasteners are fully compliant with RoHS 3 (2015/863/EU) environmental regulations, ensuring they contain no restricted hazardous substances for global market acceptance and environmental safety.

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