S-90385A347 Length 1 3/4" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Excellent thread-forming capability creates permanent, vibration-resistant threads in plastic materials without pre-tapping
• Optimized pan head design provides a low-profile, finished appearance while distributing clamping force effectively
• Reliable Phillips drive system ensures secure tool engagement and consistent installation torque control
• Full-length threading delivers maximum grip length and holding power throughout the entire fastener engagement
• Precision-engineered thread pitch (18 TPI) ensures optimal material displacement and superior pull-out resistance
• Industry-standard compliance guarantees consistent quality and dimensional accuracy for reliable assembly operations

Professional Applications & Engineering Value

These zinc-plated steel tapping screws are specifically engineered for plastic fastening applications where reliability and vibration resistance are critical. The thread forming technology (DST type) creates strong, permanent threads in plastic substrates without creating chips or debris, making them ideal for electronics enclosures, automotive trim components, and industrial plastic assemblies. The Phillips drive system combined with the pan head design provides excellent torque transmission while maintaining a low-profile appearance. The zinc plating offers essential corrosion protection, ensuring long-term performance in environments where moisture or chemical exposure may be present. These screws are particularly valuable in applications requiring repeated disassembly and reassembly, as the formed threads maintain their integrity through multiple cycles.

Specification Summary & Compliance

These No. 8 x 1-3/4" tapping screws feature a 0.164" thread diameter with 18 threads per inch and are designed for use with a No. 30 drill bit (0.1285" diameter). Manufactured to ASME B18.6.3 specifications, they ensure dimensional accuracy and consistent performance. The thread forming (DST) design provides reliable fastening in plastic materials without requiring pre-tapped holes. The screws are fully threaded with a blunt tip for controlled penetration and optimal thread formation. Compliance with industry standards guarantees interchangeability and reliable performance in industrial assembly operations.