S-91345A728 1/2"-13 x 4" Fiberglass Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with fiberglass construction, eliminating rust and degradation in harsh environments
• Excellent temperature tolerance from -60° to 190°F for reliable performance in extreme thermal conditions
• Integrated flange design provides built-in washer functionality, distributing load evenly and preventing surface damage
• Precision Class 2A thread fit ensures smooth installation and secure fastening with consistent engagement
• External hex drive compatibility with standard tools for quick installation and removal in confined spaces
• RoHS 3 compliance guarantees environmentally responsible manufacturing without restricted hazardous substances
• Partial threading configuration offers optimal grip strength while reducing material stress concentrations

Professional Applications & Engineering Value

This fiberglass hex head screw delivers exceptional value in corrosive and electrically sensitive applications where metal fasteners would fail. The gray fiberglass construction provides inherent resistance to chemicals, moisture, and UV exposure while maintaining dimensional stability across its wide temperature range. The UNC coarse thread pattern ensures rapid installation and superior holding power in fiber-reinforced composites and softer materials. The flanged design eliminates the need for separate washers, streamlining assembly in industrial equipment, chemical processing systems, and marine environments where corrosion resistance is critical. The external hex drive accommodates standard wrenching tools for reliable torque application in high-vibration applications.

Specification Summary & Compliance

This 1/2"-13 UNC hex head screw features Class 2A thread fit tolerances per ASME B1.1 standards, ensuring precise thread engagement and interchangeability. The partially threaded configuration with 2" minimum thread length provides optimal clamping performance. Manufacturing complies with RoHS 3 (2015/863/EU) regulations, confirming absence of restricted hazardous substances. The coarse thread spacing and right-hand thread direction follow established UNC threading specifications for reliable performance in industrial fastening applications.