S-99091A537 1/4"-20 x 1/2" Plastic Hex Head Screws

Plastic Hex Head Screws

0251FA00252 Plastic Hex Head Screws
0251FA00252 Plastic Hex Head Screws

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

Part No.
Part No. 0251FA00252
Equivalent to mcmaster :
99091A537

Basic Information

Color Black
System of Measurement Inch

Head Parameters

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

Dimensions

Length 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
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Key Features & Benefits at a Glance

  • Superior corrosion resistance ensures long-lasting performance in harsh environments without rust or degradation.
  • Excellent electrical insulation properties prevent short circuits, making them ideal for electronic and electrical assemblies.
  • Wide temperature tolerance from -40°F to 185°F maintains integrity in varying operational conditions.
  • Easy installation with external hex drive allows for quick, secure fastening using standard tools.
  • Coarse UNC threading with Class 2A fit provides reliable grip and vibration resistance in various materials.
  • Lightweight and non-conductive nylon construction reduces overall weight and eliminates electrical hazards.
  • RoHS 3 compliance guarantees environmental safety and adherence to international regulations.

Professional Applications & Engineering Value

Engineered for demanding industrial and electronic applications, these nylon hex head screws address critical challenges like corrosion and electrical conductivity. The black nylon plastic material offers inherent resistance to chemicals and moisture, eliminating the need for additional coatings. With UNC coarse threads and Class 2A fit, they ensure precise engagement and hold in plastics, wood, or metal, reducing the risk of stripping. The fully threaded design and external hex drive streamline assembly in tight spaces, enhancing efficiency in electronic enclosures, control panels, and outdoor equipment where durability and safety are paramount.

Specification Summary & Compliance

This screw adheres to UNC thread standards with a 1/4"-20 thread size and Class 2A thread fit for consistent dimensional accuracy. It is manufactured from nylon plastic and features a coarse thread spacing and fully threaded length of 1/2". Compliance includes RoHS 3 (2015/863/EU), ensuring it meets strict environmental regulations for hazardous substance restrictions.

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