S-91781A258 10-24 x 2 3/4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-term fastening
• Precision thread engagement with Class 2A UNC coarse threads ensuring secure fits and reduced cross-threading risks
• Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration
• Enhanced installation control through slotted drive design, compatible with standard tools
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH)
• Versatile partial threading allowing unthreaded shank sections for precise clamping in assembled components

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these 10-24 UNC flat head screws deliver critical performance advantages where material integrity and corrosion resistance are paramount. The 18-8 stainless steel composition, enhanced by passivated surface treatment, provides exceptional protection against chemical exposure and oxidation in manufacturing, marine, or outdoor equipment. The coarse UNC threading and Class 2A thread fit enable rapid assembly with consistent torque transmission, while the 82° countersink ensures flush mounting in precision machinery, enclosures, and structural frameworks. These partially threaded screws effectively distribute shear loads, preventing joint loosening under vibration—making them indispensable for heavy-duty fasteners in automotive, aerospace, and industrial machinery sectors.

Specification Summary & Compliance

This 2 3/4" flat head screw maintains Class 2A thread fit per UNC standards with 10-24 coarse threading and partial threading up to 1 1/2" minimum thread length. Manufactured in compliance with ASME B18.6.3 dimensional and mechanical specifications, it also fulfills RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions.