S-90086A545 1/4"-20 x 1 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Efficient self-tapping installation with Type F thread cutting design, eliminating the need for pre-tapped holes in materials like aluminum and cast iron
• Secure flush mounting with standard 82° flat head profile, providing a smooth finished surface when countersunk
• Reliable drive engagement through No. 3 Phillips drive, reducing cam-out risks during high-torque installation
• Optimized thread engagement with UNC coarse threading and full-length threads, ensuring maximum holding power in sheet metal applications
• Precise material compatibility with recommended No. 1 drill bit (0.228"), enabling clean hole preparation for various metals
• Industry-standard compliance meeting ASME B18.6.3 and RoHS 3 regulations, guaranteeing quality and environmental safety

Professional Applications & Engineering Value

These 1/4"-20 thread cutting screws deliver exceptional engineering value by solving critical fastening challenges in aluminum, brass, cast iron, and sheet metal applications. The zinc-plated steel construction provides essential corrosion protection for industrial environments, while the Type F tapping screw design with UNC coarse threads creates precise mating threads in parent materials without pre-tapping. This eliminates secondary operations and reduces assembly time significantly. The Phillips flat head with 82° countersink angle ensures flush mounting in precision applications, preventing surface protrusions that could interfere with mechanical operations. The combination of right-hand threading and blunt tip facilitates straightforward installation while maintaining material integrity, making these screws ideal for construction, manufacturing, and metal fabrication where reliable, permanent fastening is required.

Specification Summary & Compliance

This 1/4"-20 tapping screw features standard UNC coarse threading with full thread engagement and complies with ASME B18.6.3 manufacturing specifications SAE J933. The screw maintains dimensional accuracy with a 1/4" thread diameter, 1 1/2" length, and standard 82° countersink angle for proper seating. Environmental compliance is assured through RoHS 3 (2015/863/EU) compliance, meeting international restrictions on hazardous substances. The product is manufactured to precise tolerances for consistent performance in industrial fastening applications.