S-90380A278 Length 1 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior plastic retention with tri-lobe shank design that displaces material to create permanent, vibration-resistant threads
• Corrosion-resistant zinc plating provides durable surface protection for extended service life in various environments
• Efficient thread forming eliminates chip formation and prevents material stress cracks in plastic components
• Secure Phillips No. 1 drive ensures controlled installation torque and reduces cam-out during assembly
• Full threading along 1-1/2" length delivers maximum engagement and pull-out resistance in plastic applications
• Precision-engineered TRS design with 20 threads per inch for optimal fastening performance in plastic materials
• Industry compliance assurance meets RoHS 3 and REACH environmental standards for safe industrial use

Professional Applications & Engineering Value

These No. 4 x 1-1/2" zinc-plated steel TRS tapping screws are specifically engineered to address common plastic fastening challenges. The thread forming technology creates strong, permanent threads in plastic materials without generating chips that could contaminate sensitive components. The tri-lobe shank cross-section compresses surrounding material to establish exceptional holding power that resists vibration loosening and pull-out forces. With a blunt tip design and precise 0.112" thread diameter, these screws provide controlled penetration that minimizes stress cracking in brittle plastics. Ideal for plastic assembly applications in electronics enclosures, automotive components, and industrial equipment, these Phillips drive screws deliver reliable performance where material integrity and long-term fastening security are critical.

Specification Summary & Compliance

These tapping screws feature a No. 4 screw size with 1-1/2" length and fully threaded right-hand configuration. The precision thread forming design operates with a No. 37 drill bit (0.104" diameter) and delivers 20 threads per inch for optimal plastic engagement. Manufactured to TRS (Thread Rolling Screw) standards with pan head style and Phillips No. 1 drive. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial safety standards.