S-90275A729 1/2"-13 x 4" ASME B18.6.3 Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in harsh industrial environments
• Superior load-bearing capacity with 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Precision thread engagement through Class 2A thread fit and UNC coarse threads, providing secure fastening and reduced cross-threading risk
• Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation control via slotted drive style, allowing straightforward manual assembly with standard tools
• Reliable partial threading design that maintains unthreaded shank strength while ensuring sufficient thread engagement
• Full regulatory compliance meeting ASME B18.6.3 specifications, RoHS 3, and REACH environmental standards

Professional Applications & Engineering Value

These 1/2"-13 UNC flat head screws deliver critical performance advantages for industrial assembly applications where vibration resistance and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, equipment frames, and structural components exposed to demanding environments. The coarse UNC threading ensures rapid installation and superior holding power in wood, metal, and composite materials, while the partially threaded design prevents joint loosening under dynamic loads. The 82° countersink angle and standard flat head profile create flush surfaces in predrilled applications, eliminating protrusions that could interfere with moving parts or create safety hazards. These slotted drive fasteners offer reliable manual installation where power tools are impractical, making them ideal for maintenance, repair, and precision assembly operations across manufacturing, construction, and heavy equipment sectors.

Specification Summary & Compliance

This 4" length flat head screw features precision Class 2A thread fit tolerances with 1/2"-13 UNC coarse threads and right-hand thread direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility in industrial supply chains.