S-91771A858 1/2"-13 x 1 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional tensile strength rated at 80,000 psi for reliable performance in heavy-duty applications
- Precise Class 2A thread fit ensures smooth installation and secure fastening with consistent engagement
- Full threading design provides maximum grip length and uniform load distribution across the entire fastener
- Standard 82° countersink angle enables flush mounting and clean aesthetic finish in assembled products
- Phillips No. 4 drive compatibility offers familiar, efficient installation with standard driving tools
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH regulations for quality assurance
Professional Applications & Engineering Value
These 1/2"-13 UNC flat head 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 industrial equipment. The coarse UNC thread pattern combined with Class 2A fit ensures rapid assembly and reliable performance in vibration-prone applications. The fully threaded design maximizes surface contact area, distributing stress evenly to prevent joint failure. With their 82° countersink angle and flat head profile, these screws provide seamless integration in machinery, structural frameworks, and precision equipment where flush mounting is essential for both safety and aesthetics.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards, these flat head screws feature 1/2"-13 UNC coarse threads with Class 2A thread fit for consistent dimensional accuracy. The fully threaded design maintains uniform engagement, while the 82° countersink angle meets industry-standard specifications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and material transparency, making them suitable for global industrial supply chains and regulated applications.
