S-90434A121 Length 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black Oxide Steel coating, extending service life in various industrial environments
• Enhanced holding power in plastic materials due to the Tri-Lobe shank design that displaces material without creating chips
• Secure and efficient installation with Phillips No. 1 drive, reducing cam-out and ensuring proper torque application
• Reliable thread forming capability for strong, vibration-resistant fastening in plastic assemblies without pre-tapping
• Full threading along the 1/2" length provides consistent grip and load distribution across the entire engagement area
• Optimized for plastic applications with a blunt tip and specific thread design to prevent material cracking or stress damage
• Compliance with international safety standards including RoHS 3 and REACH, ensuring safe use in regulated industries

Professional Applications & Engineering Value

These TRS thread forming screws are specifically engineered for plastic fastening applications, where traditional fasteners may strip threads or cause material failure. The Tri-Lobe shank cross-section and thread forming tapping method create strong, permanent threads in plastic materials by displacing rather than removing material, eliminating chips that could contaminate sensitive assemblies. The Black Oxide Steel construction provides essential corrosion protection for industrial environments, while the Phillips flat head design sits flush with surfaces for clean, professional finishes. These screws are ideal for plastic assembly in automotive components, electronics enclosures, and consumer products where vibration resistance and long-term reliability are critical. The combination of 0.112" thread diameter and 20 TPI thread pitch ensures optimal engagement in various plastic densities without compromising material integrity.

Specification Summary & Compliance

This No. 4 x 1/2" TRS tapping screw features a standard 82° countersink angle flat head profile with fully threaded right-hand direction. The screw maintains precise dimensional accuracy with 0.212" head diameter and 0.067" head height for consistent performance. Manufactured to meet industry standards for thread forming screws, it is designed for use with No. 37 drill bit (0.104" diameter) for proper hole preparation in plastic materials. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting the latest environmental and safety regulations for industrial components.