S-91099A471 10-24 x 1 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Passivated 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement through UNC coarse spacing and Class 2A fit, ensuring consistent fastening and vibration resistance
• Optimized flush mounting with 82° countersink angle and undercut flat head design for seamless surface integration
• Enhanced installation efficiency with Phillips No. 2 drive, providing secure torque transfer during assembly
• Full-threaded reliability across the entire 1-1/4" length, maximizing grip strength in various material thicknesses
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3/REACH)

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these flat head Phillips machine screws deliver critical performance where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides excellent protection against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, food processing machinery, and outdoor industrial assemblies. The combination of UNC coarse threading with Class 2A fit ensures rapid installation and secure holding power in metals, plastics, and composite materials. The undercut flat head profile with 82° countersink allows for completely flush mounting in precision-machined components, eliminating protrusions that could interfere with moving parts or create safety hazards. With full threading along the entire shank, these screws maintain consistent clamping force across varying material thicknesses, preventing loosening under dynamic loads and vibration.

Specification Summary & Compliance

This 10-24 x 1-1/4" machine screw maintains precision Class 2A thread fit with UNC coarse thread spacing and right-hand threading direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance standards. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial markets and environmentally conscious manufacturing operations.