S-90086A552 1/4"-20 x 2 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior thread cutting performance with Type F design for reliable fastening in aluminum, brass, cast iron, and sheet metal without pre-tapped holes
• Enhanced corrosion resistance from zinc-plated steel construction, extending service life in demanding industrial environments
• Maximum holding power through fully threaded UNC coarse threads that provide excellent grip and vibration resistance
• Efficient installation with Phillips No. 3 drive system offering secure tool engagement and reduced cam-out risk
• Flush surface finish thanks to standard 82° flat head profile that sits neatly in countersunk applications
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and performance
• Environmental responsibility with RoHS 3 compliance, ensuring safe use in regulated applications

Professional Applications & Engineering Value

These 1/4-20 zinc-plated steel tapping screws with Type F thread cutting design solve critical fastening challenges in metalworking and manufacturing. The UNC coarse threads and specialized cutting edges create precise mating threads in aluminum, brass, cast iron, and sheet metal substrates, eliminating the need for separate tapping operations and reducing assembly time. The zinc-plated steel construction provides essential corrosion protection for industrial environments, while the Phillips No. 3 drive ensures efficient installation with standard tools. The flat head with 82° countersink delivers a clean, flush finish ideal for applications where surface smoothness matters. These thread cutting screws maintain integrity under vibration and load, making them perfect for machinery assembly, metal fabrication, and construction projects requiring durable, self-tapping fasteners.

Specification Summary & Compliance

These tapping screws feature 1/4"-20 UNC coarse threads with standard Class 2A tolerances and full threading for maximum engagement. Manufacturing conforms to ASME B18.6.3 specifications (SAE J933), ensuring dimensional accuracy and performance reliability. The products are RoHS 3 (2015/863/EU) compliant for environmental safety and suitable for use with No. 1 drill bit (0.228" diameter) for optimal thread cutting performance in designated materials.