S-90086A683 1/4"-20 x 3/4" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel coating that protects against rust in demanding industrial environments
• Excellent material compatibility with thread-cutting design that creates strong, permanent threads in aluminum, brass, cast iron, and sheet metal
• Optimized driving efficiency through No. 3 Phillips drive that prevents cam-out and ensures secure installation
• Flush surface finishing with standard 82° flat head profile that sits perfectly countersunk for smooth, professional applications
• Reliable coarse threading with UNC 1/4"-20 specification that provides superior holding power in various materials
• Full-thread engagement along the entire 3/4" length for maximum grip strength and vibration resistance
• Industry compliance assurance meeting ASME B18.6.3 standards and RoHS 3 environmental regulations

Professional Applications & Engineering Value

These black-oxide steel tapping screws with 1/4"-20 UNC coarse threading deliver exceptional performance in metalworking applications where traditional fasteners fail. The thread-cutting Type F design eliminates the need for pre-tapped holes, significantly reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal assemblies. The black-oxide surface treatment provides durable corrosion protection while the 82° countersink angle ensures flush mounting for safety and aesthetics. Engineered with fully threaded shanks and No. 3 Phillips drive, these screws maintain consistent clamping force and resist vibration loosening in demanding industrial environments, making them ideal for manufacturing, automotive, and construction applications where reliability is critical.

Specification Summary & Compliance

These tapping screws feature precise 1/4"-20 UNC coarse threads with standard Class 2A tolerance for consistent performance. The manufacturing process strictly adheres to ASME B18.6.3 specifications SAE J933, ensuring dimensional accuracy and mechanical properties. The black-oxide steel construction provides enhanced durability while maintaining compliance with RoHS 3 (2015/863/EU) environmental standards. With fully threaded design and standard 82° countersink angle, these screws deliver reliable performance in various metal fastening applications while meeting industry quality and safety requirements.