S-90087A896 5/16"-18 x 1 1/4" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior Thread-Cutting Performance – Type F design with coarse UNC threading ensures secure, permanent fastening in tough materials like aluminum and cast iron without pre-tapping.
• Enhanced Corrosion Resistance – Zinc-plated steel construction provides reliable protection against rust, extending service life in industrial environments.
• Optimized Drive Efficiency – Phillips No. 4 drive offers excellent torque transfer and reduces cam-out, speeding up assembly while minimizing tool wear.
• Full-Length Threading for Maximum Grip – Fully threaded shank distributes clamping force evenly, preventing loosening under vibration and load.
• Precision Drill Compatibility – Blunt tip design works with standard 0.281" (K-size) drill bits, ensuring accurate pilot holes and reducing installation errors.
• Broad Material Versatility – Engineered for use in aluminum, brass, cast iron, and sheet metal, making it a versatile choice for multi-material assemblies.
• Standardized Pan Head Profile – Rounded pan head offers a low-profile finish and consistent seating, improving aesthetics and load distribution.

Professional Applications & Engineering Value

These zinc-plated steel tapping screws are engineered to solve common fastening challenges in metalworking and fabrication. The thread-cutting Type F design with coarse UNC 5/16"-18 threads creates precise, durable threads in ductile materials like aluminum, brass, and cast iron, eliminating the need for separate tapping operations and reducing assembly time. The fully threaded, blunt tip ensures consistent engagement across the entire shank, providing reliable pull-out resistance in sheet metal applications. With a Phillips No. 4 drive and zinc plating, these screws deliver easy installation, corrosion resistance, and long-term performance in HVAC, machinery, and automotive assemblies, making them a cost-effective solution for high-volume production.

Specification Summary & Compliance

This 5/16"-18 tapping screw features a 1 1/4" length, coarse UNC thread with standard Class 2A tolerances, and a pan head with Phillips No. 4 drive. Manufactured from zinc-plated steel, it meets ASME B18.6.3 and SAE J933 specifications, ensuring dimensional accuracy, thread integrity, and performance reliability. The product is designed for use with a 0.281" (K-size) drill bit and complies with RoHS and REACH environmental standards for safe industrial use.