S-90380A120 Length 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior plastic retention with tri-lobe shank design that creates strong, vibration-resistant threads without cracking or stressing plastic materials
• Corrosion-resistant zinc plating provides durable surface protection for extended service life in industrial environments
• Efficient installation with Phillips No. 1 drive that offers reliable torque transfer and prevents cam-out during assembly
• Complete thread engagement with fully threaded 20 TPI design ensures maximum holding power across the entire fastener length
• Optimized plastic compatibility through thread forming technology that displaces material without creating chips or debris
• Precision sizing with No. 4 diameter and 3/4" length for consistent performance in standardized plastic assemblies
• Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

These zinc-plated steel TRS thread forming screws are specifically engineered to address common challenges in plastic assembly applications. The unique tri-lobe shank cross-section and thread forming tapping method create secure, permanent threads in plastic materials without the risk of material cracking or stress concentration that can occur with traditional thread cutting screws. This design is particularly valuable in plastic component manufacturing where vibration resistance and long-term joint integrity are critical. The Phillips drive style ensures reliable installation with standard tools, while the fully threaded configuration provides consistent clamping force throughout the engagement length. These thread forming fasteners eliminate the need for separate tapping operations, reducing assembly time and costs in high-volume production environments.

Specification Summary & Compliance

These No. 4 x 3/4" thread forming screws feature precise dimensional specifications including 0.112" thread diameter, 20 threads per inch, and are designed for use with No. 37 drill bit (0.104" diameter). The fasteners maintain standard thread forming screw tolerances and are manufactured from zinc-plated steel for consistent performance. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet current industry standards for hazardous substance restrictions and chemical safety requirements.