S-97690A178 1/4"-20 x 1/2" ASME B18.6.3 Steel Pan Head Torx Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Superior torque transmission through T30 Torx drive design, reducing cam-out and tool wear during high-torque applications
• Optimized seating and clamping force with standard pan head profile distributing pressure evenly across fastened materials
• Reliable thread engagement with fully threaded UNC coarse threads ensuring consistent holding power across the entire 1/2" length
• Exceptional mechanical strength from Rockwell B70 hardness rating, resisting deformation under heavy loads
• Precise installation compatibility with Class 2A thread fit meeting standard industrial assembly requirements
• Visual identification and additional protection through black painted finish for both aesthetic and corrosion-resistant benefits

Professional Applications & Engineering Value

These zinc-plated steel Torx pan head screws deliver critical performance advantages for industrial assembly applications where vibration resistance and long-term reliability are paramount. The combination of UNC coarse threading and fully threaded design ensures rapid installation and maximum thread engagement in various materials, from machinery frames to electrical enclosures. The T30 Torx drive system addresses common fastener challenges by providing superior torque transfer compared to traditional drive types, significantly reducing stripping and improving installation efficiency. With Rockwell B70 hardness, these screws maintain structural integrity under repetitive stress, making them ideal for heavy-duty industrial equipment, automotive assemblies, and construction applications where mechanical failure is not an option.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances ensuring consistent performance across industrial applications. The 1/4"-20 UNC coarse thread configuration provides reliable fastening in various materials while the zinc-plated steel construction with black painted finish offers enhanced corrosion protection. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures these screws meet the latest international standards for restricted substances, making them suitable for global supply chains and environmentally conscious manufacturing operations.