S-91244A585 5/16"-18 x 1 1/4" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Corrosion-free performance thanks to durable nylon plastic construction, ideal for humid or chemical environments
• Secure fastening with Class 2A thread fit ensures reliable engagement and vibration resistance in assemblies
• Wide temperature tolerance from -40°F to 185°F maintains integrity in varied operating conditions
• Easy installation with external hex drive allows for quick torque application using standard tools
• RoHS 3 compliance meets environmental regulations for safe use in industrial and consumer products
• Coarse UNC threading provides faster assembly and reduced cross-threading risk compared to fine threads
• Partial threading design offers optimized grip length for specific clamping applications without unnecessary weight

Professional Applications & Engineering Value

These 5/16"-18 UNC nylon hex head screws deliver exceptional value in applications where metal fasteners fail, such as electrical enclosures, marine equipment, and food processing machinery. The off-white nylon plastic material inherently resists corrosion, oxidation, and galvanic reactions, eliminating the need for additional coatings. With a temperature range of -40°F to 185°F, they maintain dimensional stability in both freezing and elevated temperature environments. The coarse thread configuration and Class 2A thread fit ensure reliable engagement in plastic and soft material assemblies, reducing installation time and preventing stripping. Their non-conductive and non-magnetic properties make them ideal for electronic applications where electrical isolation is critical.

Specification Summary & Compliance

This hex head screw features UNC coarse threads with Class 2A thread fit per ASME B1.1 standards, ensuring precise dimensional accuracy. The partially threaded design provides a minimum thread length of 7/8" on a 1-1/4" overall length. Manufactured from nylon plastic with off-white coloration, these screws are fully RoHS 3 (2015/863/EU) compliant for hazardous substance restrictions. The external hex drive (1/2" head width) accommodates standard wrenching tools for efficient installation across industrial applications.