S-91345A552 1/4"-20 x 1/2" Fiberglass Hex Head Screws

Fiberglass Hex Head Screws

0257FA00001 Fiberglass Hex Head Screws
0257FA00001 Fiberglass Hex Head Screws

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

Part No.
Part No. 0257FA00001
Equivalent to mcmaster :
91345A552

Basic Information

Color Gray
System of Measurement Inch

Head Parameters

Head Type Hex
Head Width 7/16"
Head Height 13/64"

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 Fiberglass
Hardness Not Rated

Temperature & Environment

Temperature Range -60° to 190° 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 thanks to high-quality fiberglass construction, ideal for harsh industrial environments
  • Excellent thermal stability with a wide operating range from -60°F to 190°F, ensuring reliable performance under temperature fluctuations
  • Maximum torque application enabled by the external hex drive and hex head design for secure, efficient installation
  • Enhanced thread engagement with fully threaded UNC coarse spacing, providing strong, consistent holding power
  • Precise thread fit with Class 2A tolerance, ensuring smooth assembly and reliable fastening in industrial applications
  • Environmental compliance meeting RoHS 3 standards, supporting safe and sustainable manufacturing practices
  • Versatile right-hand threading for standard installation processes, reducing assembly time and errors

Professional Applications & Engineering Value

This 1/4"-20 UNC hex head screw is engineered with fiberglass material to address common industrial challenges like corrosion and thermal stress. Its fully threaded coarse spacing and Class 2A thread fit ensure quick, secure fastening in equipment exposed to varying temperatures, from -60°F to 190°F. The external hex drive allows for high-torque applications, minimizing slippage and enhancing reliability in assembly lines, electrical enclosures, and machinery. By combining RoHS 3 compliance with durable gray fiberglass construction, it reduces maintenance needs and supports long-term performance in corrosive or high-heat settings, making it a cost-effective solution for B2B sectors like automotive, construction, and industrial manufacturing.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a Class 2A thread fit for precise dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) regulations, ensuring environmental safety. Specifications include a 1/4"-20 thread size, 1/2" length, and right-hand threading, designed for reliable performance in inch-based fastening systems.

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