S-91771A305 12-24 x 3" 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 for long-term reliability in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness to withstand heavy-duty applications
• Precision thread engagement through Class 2A thread fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced driving efficiency with Phillips No. 3 drive providing reliable torque transfer during installation
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH)
• Versatile partial threading allowing both secure clamping and adjustment flexibility in assembly applications

Professional Applications & Engineering Value

These 12-24 UNC flat head screws deliver critical performance advantages for industrial applications where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these heavy-duty screws ideal for marine equipment, food processing machinery, and outdoor structures. The partially threaded design with coarse UNC threads ensures optimal grip in various materials while preventing loosening under vibration. With their 82° countersink angle and Phillips drive, these flat head fasteners enable flush mounting in precision assemblies where surface clearance is critical. The combination of 80000 psi tensile strength and standardized dimensions per ASME B18.6.3 makes them reliable components for structural frameworks, equipment manufacturing, and maintenance operations requiring durable, specification-compliant fastening solutions.

Specification Summary & Compliance

These 3" flat head screws feature precision Class 2A thread fit with 12-24 UNC coarse threads and right-hand thread direction, manufactured to exacting dimensional standards. The fasteners comply with ASME B18.6.3 mechanical and dimensional specifications, ensuring interchangeability and reliability. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming the absence of restricted substances. The partially threaded configuration provides 1½" minimum thread length with consistent Rockwell B80 hardness throughout, delivering reliable performance in demanding industrial applications.