S-91244A579 5/16"-18 x 1/2" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from nylon plastic construction, eliminating rust issues in demanding environments
• Easy installation and removal with external hex drive design providing reliable torque transfer
• Broad temperature tolerance (-40° to 185°F) ensuring performance stability across various operating conditions
• Precise thread engagement with Class 2A UNC coarse threads for secure fastening in plastic and soft materials
• Full threading capability along the entire 1/2" length for maximum grip and holding power
• Environmental compliance with RoHS 3 standards, meeting international regulatory requirements
• Non-conductive properties making them ideal for electrical insulation applications

Professional Applications & Engineering Value

These nylon plastic hex head screws with 5/16"-18 UNC coarse threading provide exceptional value in applications where metal fasteners would compromise performance. The off-white nylon material offers inherent corrosion resistance, eliminating galvanic corrosion concerns when mating with dissimilar metals. The external hex drive ensures straightforward installation with standard tools while the Class 2A thread fit maintains precise tolerances for reliable assembly. These screws excel in electrical enclosures, marine components, food processing equipment, and chemical environments where non-conductive properties and chemical inertness are critical. The temperature range of -40° to 185°F ensures dimensional stability across extreme conditions, making them suitable for outdoor and industrial applications where thermal cycling occurs.

Specification Summary & Compliance

This 5/16"-18 UNC hex head screw features precise Class 2A thread fit per Unified Thread Standard specifications, ensuring consistent engagement and reliable fastening performance. The screw maintains full threading along its entire 1/2" length with coarse thread spacing optimized for plastic and soft material applications. Manufactured from high-quality nylon plastic, the fastener complies with RoHS 3 (2015/863/EU) regulations, containing no restricted hazardous substances. The combination of external hex drive with standardized UNC thread form provides compatibility with industry-standard installation tools and procedures.