S-91771A859 1/2"-13 x 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, ensuring long-term reliability in harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for heavy-duty applications
• Precise Class 2A thread fit and UNC coarse threads for secure, vibration-resistant fastening and easy installation
• Fully threaded design provides maximum grip and load distribution along the entire 2" length
• Standard 82° countersink angle enables flush mounting for clean, professional finishes
• Phillips No. 4 drive offers efficient installation with common tools while minimizing cam-out risks
• Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH standards for quality assurance and environmental safety

Professional Applications & Engineering Value

These 1/2"-13 UNC flat head screws deliver critical performance advantages for demanding industrial applications. The passivated 18-8 stainless steel construction provides exceptional corrosion resistance, making them ideal for environments exposed to moisture, chemicals, or outdoor elements. The fully threaded design ensures maximum engagement strength across the entire 2" length, while the UNC coarse threads and Class 2A thread fit provide reliable fastening in various materials without stripping. The 82° countersink angle allows for flush installation in machinery, structural assemblies, and equipment where protruding fasteners are unacceptable. With 80,000 psi tensile strength and Rockwell B80 hardness, these flat head screws maintain integrity under significant mechanical stress, vibration, and thermal cycling in manufacturing, construction, and heavy equipment applications.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC 1/2"-13 coarse threads in right-hand direction. The 2" length features complete threading with standard flat head profile and 82° countersink angle. These screws conform to ASME B18.6.3 specifications for dimensional accuracy and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring safe use in regulated industries and international markets.