S-90434A187 Length 5/16" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in various environments
• Excellent holding power in plastic materials thanks to the thread-forming TRS design that creates strong, permanent threads
• Reduced installation torque and prevention of boss cracking through the innovative Tri-Lobe shank cross-section
• Secure flush mounting with standard flat head profile and 82° countersink angle for clean, professional finishes
• Reliable drive engagement with Phillips No. 1 drive style preventing cam-out during installation
• Maximum thread engagement through fully threaded design with 20 threads per inch for superior pull-out resistance
• Compliance with international environmental standards including RoHS 3 and REACH for global manufacturing applications

Professional Applications & Engineering Value

These No. 4 zinc-plated steel TRS tapping screws are specifically engineered for plastic fastening applications where traditional fasteners fail. The thread forming technology eliminates the need for pre-tapped holes while the Tri-Lobe shank design displaces material during installation, creating zero-clearance threads that significantly reduce stress concentrations in plastic bosses. This innovative approach prevents the common problem of plastic cracking around fastener holes, extending product lifespan in plastic assembly scenarios. The combination of zinc-plated steel construction and fully threaded design ensures reliable performance in demanding industrial environments, from automotive components to electronic enclosures and consumer products requiring durable plastic fastening solutions.

Specification Summary & Compliance

These TRS type F tapping screws feature precise dimensional accuracy with 5/16" length, 0.112" thread diameter, and 20 TPI thread pitch. The standard flat head profile with 82° countersink angle ensures proper seating in prepared holes. Manufactured to meet industry standards for thread forming screws, these fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring certified components.