S-90380A277 Length 1 3/8" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in various industrial environments
• Efficient thread-forming capability with TRS tri-lobe shank design, creating strong, permanent threads in plastic materials without pre-tapping
• Enhanced driving stability through Phillips No. 1 drive system, reducing cam-out and improving installation efficiency
• Optimal material displacement with fully threaded 0.112" diameter design and 20 TPI, minimizing stress and preventing plastic cracking
• Versatile pan head profile providing excellent bearing surface and professional finished appearance in assembled products
• Precision compatibility with No. 37 drill bit (0.104" diameter), ensuring proper fit and maximum holding power in plastic applications
• Environmental compliance assurance meeting RoHS 3 and REACH standards for global manufacturing requirements

Professional Applications & Engineering Value

These zinc-plated steel TRS tapping screws deliver exceptional engineering value in plastic assembly applications where material integrity is critical. The thread-forming tri-lobe shank design significantly reduces installation torque while creating strong, vibration-resistant threads that won't strip or loosen over time. The fully threaded configuration ensures maximum engagement throughout the entire 1-3/8" length, providing superior pull-out resistance in thermoplastics and other plastic substrates. The Phillips drive system offers reliable installation with standard tools, while the rounded pan head distributes clamping force evenly to prevent surface damage. These self-tapping screws eliminate the need for separate tapping operations, streamlining production processes in automotive trim, electronic enclosures, and consumer product assemblies where plastic-to-plastic or plastic-to-metal fastening is required.

Specification Summary & Compliance

These precision No. 4 tapping screws feature a 0.112" thread diameter with 20 threads per inch and Class 2A thread tolerances for consistent performance. The TRS thread-forming design follows industry-standard thread forming specifications for plastic applications. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global markets. The screws are engineered for use with No. 37 drill bits (0.104" diameter) as specified for optimal performance in plastic substrates.