S-90385A191 Length 1/4" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior plastic retention with thread-forming DST design that creates strong, permanent threads without pre-tapping
• Enhanced corrosion resistance through zinc plating, extending service life in various industrial environments
• Optimized drive efficiency with Phillips No. 2 head providing reliable torque transfer and reduced cam-out risk
• Excellent material compatibility specifically engineered for plastic substrates with minimal risk of material cracking
• Full-thread engagement along the entire 1/4" length ensures maximum holding power in plastic assemblies
• Precision dimensional control with 0.164" thread diameter and 18 TPI for consistent performance across applications
• Streamlined installation with standard pan head profile offering low-profile fastening solution

Professional Applications & Engineering Value

These zinc-plated steel tapping screws deliver exceptional value in plastic assembly applications where material integrity and long-term reliability are critical. The thread forming DST design eliminates the need for pre-tapped holes while creating strong, permanent threads in plastic substrates without generating chips or debris. This is particularly valuable in plastic fastening applications where contamination must be minimized, such as in electronic enclosures, automotive trim components, and consumer product assemblies. The combination of zinc plating corrosion resistance and Phillips drive efficiency ensures these screws maintain their performance in environments where moisture or chemical exposure might compromise ordinary fasteners. The fully threaded design provides uniform stress distribution, reducing the risk of plastic cracking or deformation under load.

Specification Summary & Compliance

These No. 8 x 1/4" tapping screws feature precision 0.164" thread diameter with 18 threads per inch and comply with ASME B18.6.3 standards for dimensional accuracy and performance. Manufactured from zinc-plated steel with Phillips No. 2 drive and DST thread forming profile, these screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet the latest industry requirements for hazardous substance restrictions.