S-90086A544 1/4"-20 x 1 1/4" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding industrial environments
• Excellent thread-cutting performance with Type F design that creates strong, permanent threads in various materials without pre-tapping
• Optimized for multiple materials including aluminum, brass, cast iron, and sheet metal applications
• Secure flush installation with standard 82° flat head profile that sits perfectly countersunk in prepared holes
• Reliable driving efficiency with No. 3 Phillips drive that prevents cam-out and ensures proper torque transmission
• Enhanced holding power through UNC coarse threading that provides superior resistance to vibration loosening
• Full regulatory compliance meeting ASME B18.6.3 specifications and RoHS 3 environmental standards

Professional Applications & Engineering Value

These 1/4-20 zinc-plated steel tapping screws deliver exceptional engineering value by solving critical fastening challenges in aluminum, brass, cast iron, and sheet metal assemblies. The Type F thread cutting design with UNC coarse spacing eliminates the need for separate tapping operations, significantly reducing installation time and labor costs while creating permanent, high-strength threads. The zinc-plated steel construction provides reliable corrosion protection, extending service life in industrial environments where moisture and chemical exposure are concerns. The 82° countersink angle ensures flush mounting in properly prepared holes, creating smooth surfaces essential for manufacturing equipment, automotive components, and structural metal frameworks. These thread cutting screws maintain dimensional stability and fastening integrity even under vibration and thermal cycling conditions common in heavy-duty applications.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 1/4"-20 UNC coarse thread spacing and Class 2A thread tolerance for consistent performance. The screws feature fully threaded design with 1 1/4" length and 0.25" thread diameter for maximum engagement strength. Compliance includes ASME B18.6.3 manufacturing specifications SAE J933, ensuring mechanical properties and dimensional accuracy. Environmental compliance verified with RoHS 3 (2015/863/EU) Compliant status, confirming restriction of hazardous substances for safe industrial use.