S-91244A581 5/16"-18 x 3/4" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance ensures long-lasting performance in harsh environments without rust or degradation
• Excellent electrical insulation properties prevent current leakage and short circuits in sensitive applications
• Wide temperature tolerance from -40° to 185°F maintains structural integrity across diverse operating conditions
• Coarse UNC threading with Class 2A fit provides quick installation and reliable holding power in plastic and soft materials
• External hex drive design enables high-torque application with standard tools for efficient assembly
• RoHS 3 compliance meets international environmental standards for hazardous substance restrictions
• Lightweight nylon construction reduces overall assembly weight while providing durable fastening performance

Professional Applications & Engineering Value

These nylon hex head screws deliver critical engineering advantages where metal fasteners fail. The off-white nylon plastic construction eliminates galvanic corrosion in mixed-material assemblies while providing essential electrical insulation in electronic enclosures, control panels, and electrical components. The coarse UNC thread profile with Class 2A fit ensures secure engagement in plastic housings, composite materials, and soft substrates without stripping or cross-threading. With full threading along the entire 3/4" length, these screws distribute clamping force evenly, preventing material stress concentration. The external hex drive accommodates high torque applications while the temperature resistance from -40° to 185°F makes them suitable for outdoor equipment, automotive components, and industrial machinery exposed to thermal cycling.

Specification Summary & Compliance

This 5/16"-18 UNC hex head screw features precise Class 2A thread fit tolerances per Unified Thread Standard specifications, ensuring consistent engagement and reliable performance. The screw maintains full UNC coarse threading throughout its 3/4" length with right-hand thread direction. Manufactured from premium nylon plastic in an off-white color, the fastener complies with RoHS 3 (2015/863/EU) regulations, confirming absence of restricted hazardous substances. The inch system measurements ensure compatibility with North American equipment and standards.