S-91297A581 5/16"-18 x 3/4" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional chemical resistance due to PTFE plastic construction, preventing degradation in harsh environments
• Wide temperature tolerance from -100° to 500°F ensures reliable performance in extreme thermal conditions
• Superior corrosion resistance for long-lasting assemblies without rust or galvanic issues
• Precise Class 2A thread fit guarantees smooth installation and secure fastening in UNC coarse threading applications
• External hex drive design allows for high-torque installation with standard tools
• Full threading along the 3/4" length provides maximum grip and adjustment flexibility
• RoHS 3 and REACH compliance meets stringent environmental regulations for global industrial use

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these PTFE plastic hex head screws solve critical challenges where metal fasteners fail. The chemical-resistant properties make them ideal for chemical processing, semiconductor manufacturing, and food processing equipment where exposure to aggressive substances is common. The extreme temperature performance (-100° to 500°F) ensures reliability in thermal cycling applications, while the UNC coarse threading with Class 2A fit provides secure fastening in plastic and soft material assemblies. The external hex drive design enables high-torque installation without stripping, making them suitable for maintenance-intensive applications where repeated access is required.

Specification Summary & Compliance

This 5/16"-18 UNC hex head screw features precise Class 2A thread fit with coarse thread spacing, manufactured to inch system standards. The fastener is fully threaded with a length of 3/4", head width of 1/2", and head height of 15/64". Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial applications worldwide.