S-91771A911 5/16"-18 x 4 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 for long-lasting performance in harsh environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing applications
- Precise flush mounting featuring standard 82° countersink angle and flat head design for seamless surface integration
- Optimized drive engagement with Phillips No. 4 drive providing secure torque transmission and reduced cam-out risk
- Reliable thread performance through Class 2A thread fit and UNC coarse threading ensuring consistent fastening integrity
- Full-length threading across the entire 4-1/2" length enables maximum grip range and adjustment flexibility
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards for global industrial use
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 5/16"-18 UNC flat head screws deliver critical performance advantages through their passivated 18-8 stainless steel composition and precision manufacturing. The combination of 80,000 psi tensile strength and Rockwell B80 hardness ensures reliable performance under substantial mechanical stress, while the fully threaded design provides maximum engagement in structural assemblies. The 82° countersink angle and flat head profile create seamless surface transitions in machinery, equipment frames, and architectural applications where protrusion cannot be tolerated. The Phillips No. 4 drive system offers efficient installation with standard tools, and the coarse UNC threading maintains holding power in vibration-prone applications across manufacturing, construction, and heavy equipment sectors.
Specification Summary & Compliance
This heavy-duty flat head screw features precise Class 2A thread fit tolerance with 5/16"-18 UNC coarse threading in right-hand orientation. Manufacturing complies with ASME B18.6.3 standards for dimensional accuracy and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring suitability for global industrial applications with restricted substance requirements.
