S-90417A117 Length 5/16" Tapping Screws

Key Features & Benefits at a Glance

• Superior holding power in plastic materials thanks to the Tri-Lobe shank cross-section that displaces material to create permanent, high-retention threads
• Enhanced corrosion resistance provided by the Black-Oxide Steel finish, extending the screw's service life in various industrial environments
• Reliable and secure installation with the Phillips No. 1 drive, minimizing cam-out and ensuring consistent torque application
• Strong, strip-resistant threads are formed without cutting, preserving material integrity and creating a vibration-resistant fastening point in plastics
• Optimized for plastic assembly with a blunt tip and thread forming (TRS) design to prevent cracking and ensure clean, precise thread creation
• Full threading for maximum grip along the entire 5/16" length, providing uniform clamping force and stability in the assembled component
• Compliance with global environmental standards, including RoHS 3 and REACH, ensuring safety and regulatory acceptance for international industrial use

Professional Applications & Engineering Value

These No. 4 x 5/16" TRS Black-Oxide Steel Tapping Screws are precision-engineered to address common challenges in plastic fastening applications. The thread forming technology eliminates the need for pre-tapped holes, as the Tri-Lobe shank cold-forms strong, durable threads directly into the plastic substrate. This process significantly reduces the risk of material stress cracking and thread stripping, which are critical failure points in plastic assemblies. The Phillips drive ensures efficient installation with standard tools, making them ideal for high-volume production lines in electronics enclosures, automotive trim, consumer appliances, and other industrial plastic components. By creating a tight, permanent fit, these screws provide long-term reliability and vibration resistance, essential for maintaining product integrity.

Specification Summary & Compliance

This screw features a 0.112" thread diameter with 20 threads per inch and a 5/16" length, designed as a Type TRS (Thread Rolling Screw) for thread forming applications. It is manufactured from Black-Oxide Steel with a pan head style and is fully threaded. For proper installation in plastics, a No. 37 drill bit (0.104" diameter) is recommended. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.