S-91345A682 1/4"-20 x 5/8" Fiberglass Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance due to fiberglass material, ideal for harsh or chemical-exposed environments without rusting or degradation.
• Enhanced installation efficiency with external hex drive and coarse UNC threading, allowing for quick, secure fastening with standard tools.
• Integrated flange design distributes load evenly, reducing the need for separate washers and providing a more stable, vibration-resistant connection.
• Wide temperature tolerance from -60° to 190°F ensures reliable performance in both freezing and moderately high-heat applications.
• Class 2A thread fit offers consistent, easy assembly with standard nuts and tapped holes, minimizing cross-threading risks.
• RoHS 3 compliance guarantees environmental safety and meets strict regulatory standards for hazardous substance restrictions.
• Full threading along the 5/8" length provides maximum grip and adjustability in various material thicknesses.

Professional Applications & Engineering Value

This 1/4-20 UNC fiberglass hex head screw is engineered to address common industrial challenges such as corrosion, electrical conductivity, and thermal expansion. The fiberglass construction inherently resists moisture, chemicals, and UV exposure, making it a preferred choice in electrical enclosures, marine hardware, and chemical processing equipment where metal fasteners would fail. The flanged design eliminates washer requirements, speeding up assembly in high-volume production lines while providing a larger bearing surface to prevent loosening under dynamic loads. With coarse threading and Class 2A fit, it ensures quick engagement and reliable performance in plastics, composites, or soft metals, reducing installation errors and maintenance downtime in demanding B2B settings.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy and interchangeability. Key specifications include a 1/4"-20 thread size, 5/8" length, and 9/16" flange diameter. It is fully threaded and features a right-hand thread direction. The product is manufactured in compliance with RoHS 3 (2015/863/EU), ensuring it is free from restricted hazardous substances, and is suitable for various industrial applications requiring reliable, non-metallic fastening solutions.