S-99512A225 Length 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in various environments
• Maximum torque transfer and reduced cam-out with Torx Plus IP10 drive for faster installation and fewer damaged drive heads
• Reliable thread-forming performance in plastic materials with TRS (Thread Rolling Screw) design that creates strong, permanent threads
• Enhanced vibration resistance through tri-lobe shank design that provides superior holding power in plastic applications
• Streamlined installation process with fully threaded design and blunt tip for precise positioning without pre-drilling in many plastics
• Broad compatibility with standard No. 37 drill bit (0.104") for consistent hole preparation in plastic components
• Environmental compliance assurance meeting RoHS 3 and REACH standards for sustainable manufacturing practices

Professional Applications & Engineering Value

These No. 4-20 x 3/4" zinc-plated steel TRS tapping screws are specifically engineered to address common challenges in plastic fastening applications. The Torx Plus IP10 drive system delivers exceptional torque transmission, eliminating the frustration of stripped drive heads during high-volume assembly operations. The tri-lobe shank design and thread forming capability create secure, vibration-resistant connections in thermoplastic materials by displacing material rather than cutting it, resulting in stronger thread engagement and reduced stress cracking. This combination of precision engineering and corrosion-resistant zinc plating makes these screws ideal for electronics enclosures, automotive plastic components, and consumer products where reliable, long-lasting fastening solutions are critical for product integrity.

Specification Summary & Compliance

This No. 4-20 x 3/4" TRS tapping screw features precision Class 2A thread tolerances with 20 threads per inch and right-hand threading. The screw meets industry-standard thread forming specifications for plastic applications with tri-lobe shank cross-section and blunt tip design. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring responsible material sourcing and production processes. The pan head style provides a standard rounded profile with 0.219" head diameter and 0.08" head height for consistent seating in plastic components.