S-91970A591 5/16"-18 x 2" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance eliminates rust concerns in harsh environments
• Excellent electrical insulation properties prevent current leakage and short circuits
• Wide temperature tolerance from -40° to 185°F ensures reliable performance in varying conditions
• External hex drive design provides secure tool engagement and easy installation
• Class 2A thread fit guarantees precise mating with standard UNC nuts and components
• Partial threading configuration offers optimal clamping force distribution
• RoHS 3 compliance meets international environmental standards for restricted substances

Professional Applications & Engineering Value

These nylon hex head screws deliver exceptional value in applications where metal fasteners fail. The black nylon material provides inherent corrosion resistance, making them ideal for chemical processing, marine, and outdoor equipment. Their electrical insulation properties are critical in electrical enclosures, control panels, and electronic assemblies where current isolation is paramount. The 5/16"-18 UNC coarse thread design ensures quick assembly and reliable performance in vibration-prone environments. With partial threading, these fasteners concentrate clamping force where needed most, preventing material distortion in plastic and composite assemblies while maintaining structural integrity across the -40° to 185°F temperature range.

Specification Summary & Compliance

Manufactured to precise UNC thread standards with Class 2A thread fit for consistent mating performance. The coarse thread spacing and 0.3125" thread diameter provide reliable engagement in various materials. These fasteners are RoHS 3 (2015/863/EU) compliant, containing no restricted hazardous substances, and feature external hex drive with 1/2" head width for standard tool compatibility. The 2" length with 7/8" minimum thread length ensures sufficient engagement depth for secure fastening applications.