S-99512A655 Length 1/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior holding power in plastic materials thanks to the Tri-Lobe shank design that creates secure, vibration-resistant threads
• Maximum torque transfer and reduced cam-out with the T10 Torx drive, allowing for higher installation efficiency and less tool wear
• Enhanced corrosion resistance provided by the Black-Oxide steel finish, extending service life in various environments
• Precise, controlled installation with the blunt tip design that prevents material splitting and ensures accurate placement
• Reliable thread formation through the thread forming (TRS) method, creating strong threads without generating chips in plastic substrates
• Broad compatibility with standard No. 37 drill bits (0.104" diameter) for streamlined assembly processes
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe, sustainable manufacturing

Professional Applications & Engineering Value

These Black-Oxide steel TRS plastic tapping screws deliver exceptional engineering value in plastic assembly applications where material integrity and joint reliability are critical. The Tri-Lobe shank design displaces plastic material during installation, creating permanent, high-retention threads that resist loosening under vibration and thermal cycling. The T10 Torx drive system provides superior torque transmission compared to traditional drives, eliminating cam-out issues that can damage screw heads and compromise assembly quality. Engineered specifically for plastic fastening applications, these thread forming screws with their blunt tip prevent stress concentration and cracking in brittle plastics, while the rounded pan head offers a low-profile finish with excellent bearing surface. The combination of precision No. 4-20 threading and corrosion-resistant Black-Oxide coating ensures long-term performance in electronics enclosures, automotive trim, consumer products, and industrial equipment where plastic-to-plastic or plastic-to-metal connections require durable, reliable fastening solutions.

Specification Summary & Compliance

These No. 4-20 x 1/4" plastic tapping screws feature precision right-hand threads with approximately 20 threads per inch and fully threaded design for maximum engagement. Manufactured to industry standards for thread forming screws with TRS (Thread Rolling Screw) specification and Tri-Lobe shank cross-section. The screws maintain dimensional accuracy with 0.112" thread diameter and are designed for use with No. 37 drill bits (0.104" diameter). Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures they meet the latest restrictions on hazardous substances for global manufacturing applications.