S-91297A540 1/4"-20 x 3/4" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional temperature resistance from -100°F to 500°F, ideal for extreme thermal cycling environments without degradation.
• Superior chemical and corrosion resistance due to PTFE plastic construction, ensuring longevity in harsh industrial settings.
• Easy installation and removal with external hex drive and standard UNC coarse threads, reducing assembly time and tool wear.
• Reliable thread engagement with Class 2A thread fit, providing consistent fastening performance in plastic-to-plastic or plastic-to-metal applications.
• Full threading along the 3/4" length maximizes grip and load distribution, enhancing joint stability in vibration-prone assemblies.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global supply chain acceptance for regulated industries.
• Lightweight and non-conductive properties reduce overall system weight and prevent electrical interference in sensitive equipment.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this 1/4-20 UNC hex head screw in white PTFE plastic addresses critical challenges like chemical exposure, thermal expansion, and electrical insulation needs. The fully threaded design and coarse thread spacing ensure secure fastening in soft materials or composite assemblies, minimizing stripping and loosening under vibration. With an external hex drive, it allows for high-torque application using standard tools, streamlining maintenance in confined spaces. Ideal for high-temperature applications such as HVAC systems, chemical processing equipment, and food machinery, this fastener provides durable, compliant performance where metal alternatives may corrode or fail. Its RoHS and REACH compliance further supports use in electronics, medical devices, and other regulated sectors, ensuring safety and reliability.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy and ease of assembly. Manufactured to inch system measurements, it features a 1/4"-20 thread size and 3/4" length with full threading. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and health standards for industrial use.