S-91771A267 2-56 x 1 1/2" 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 environments and extended service life
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under heavy loads
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent, vibration-resistant fastening in industrial applications
• Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced driving efficiency with Phillips No. 1 drive style providing secure torque transfer and reduced cam-out risk
• Full-length threading offering maximum grip and holding power across the entire 1-1/2" length
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 2-56 UNC flat head Phillips screws deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for marine, chemical processing, and outdoor equipment applications. The coarse UNC threading ensures rapid installation and superior holding power in softer materials and sheet metal assemblies. With their fully threaded design and 82° countersink angle, they create secure, flush-mounted connections that withstand vibration and thermal cycling. These industrial fasteners are engineered to prevent galvanic corrosion in mixed-material assemblies while maintaining 80,000 psi tensile strength for demanding mechanical applications.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread spacing ensuring interchangeability and reliable performance. These screws conform to ASME B18.6.3 mechanical and dimensional specifications, guaranteeing consistent quality and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they're free from restricted substances. The right-hand thread direction and standard flat head profile provide industry-standard installation compatibility across various applications.