S-90385A345 Length 1 1/4" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior plastic material compatibility - Thread forming design creates strong, permanent threads in plastic without cracking or splitting
• Enhanced corrosion resistance - Zinc-plated steel construction provides reliable protection against rust and environmental degradation
• Optimized drive efficiency - No. 2 Phillips drive ensures secure tool engagement and reduces cam-out during installation
• Maximum holding power - Fully threaded design along the entire 1-1/4" length delivers superior pull-out resistance in plastic assemblies
• Streamlined assembly process - Pre-drilling with No. 30 drill bit (0.1285") enables quick, precise installation without additional tapping
• Industry-standard reliability - Manufactured to ASME B18.6.3 specifications ensuring consistent performance and dimensional accuracy
• Versatile pan head design - Rounded profile with 0.27" diameter provides excellent bearing surface while maintaining low profile appearance

Professional Applications & Engineering Value

These No. 8 thread forming screws are specifically engineered for plastic assembly applications where traditional fastening methods often fail. The DST tapping screw type with thread forming technology displaces plastic material rather than removing it, creating stronger threads that resist stripping and pull-out forces. The zinc-plated steel construction ensures durability in various environments while the 18 TPI thread pitch provides optimal grip in plastic substrates. The Phillips drive combined with pan head design offers reliable installation torque transfer and flush seating, making these self-tapping screws for plastic ideal for electronics enclosures, automotive trim, consumer products, and industrial equipment where vibration resistance and long-term reliability are critical.

Specification Summary & Compliance

These tapping screws feature precise dimensional specifications including 0.164" thread diameter, 1-1/4" length, and right hand thread direction with fully threaded shank. Manufactured in compliance with ASME B18.6.3 standards, ensuring consistent quality and performance. The thread forming design requires No. 30 drill bit (0.1285" diameter) for proper hole preparation. The zinc-plated surface treatment provides corrosion protection while maintaining electrical conductivity where required.