S-90417A121 Length 5/8" Tapping Screws

Key Features & Benefits at a Glance

• Superior holding power in plastic with Tri-Lobe shank design that displaces material to create strong, vibration-resistant threads.
• Enhanced corrosion resistance from the Black-Oxide steel finish, extending the screw's service life in various industrial environments.
• Efficient, reliable installation with the Phillips No. 1 drive, providing good torque transfer and reducing cam-out during assembly.
• Reduced risk of material cracking thanks to the thread forming (TRS) tapping method, which forms threads without cutting and removing material.
• Secure fastening from tip to head with a fully threaded, blunt tip design that ensures consistent engagement along the entire length.
• Optimized for use with standard No. 37 drill bits (0.104" diameter), simplifying the preparation process and ensuring proper fit.
• Broad industrial compliance meeting RoHS 3 and REACH regulations, making them suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

These Black-Oxide steel thread forming screws are engineered to address common challenges in plastic fastening, such as stress cracking and strip-out. The Tri-Lobe shank cross-section and thread forming (TRS) technology work by compressing the plastic material, creating zero-clearance threads that offer exceptional resistance to loosening under vibration—a critical advantage in automotive, electronics, and appliance assemblies. The pan head with Phillips drive provides a low-profile, flush finish while allowing for efficient installation with standard tools. This combination of material strength, precise thread design (0.112" diameter, 20 TPI), and surface treatment ensures durable, reliable connections that maintain integrity in demanding environments, reducing maintenance and replacement costs.

Specification Summary & Compliance

This No. 4 x 5/8" TRS tapping screw features a right-hand thread with standard inch measurements, a pan head style, and is fully threaded. It is manufactured to precise dimensional standards for consistent performance. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industrial and consumer applications.