S-91263A571 5/16"-18 x 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive 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 zinc plating that protects against rust in demanding industrial environments
- Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 3A thread fit provides secure, consistent engagement for reduced assembly issues
- 82° countersink angle allows for flush mounting in standard applications for clean, professional finishes
- Full threading design enables maximum grip length and uniform stress distribution
- High Rockwell C39 hardness maintains thread integrity and prevents stripping during installation
- Hex drive compatibility with 3/16" drive size for secure tool engagement and efficient installation
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc-plated alloy steel construction provides durable protection against environmental factors, while the coarse UNC thread design ensures rapid installation and superior holding power in various materials. The 82° countersink angle and flat head profile create seamless surface finishes in machinery, structural frameworks, and heavy equipment assemblies. These industrial fasteners are engineered to withstand extreme mechanical stresses, making them ideal for automotive, construction, and manufacturing applications where vibration resistance and long-term reliability are essential.
Specification Summary & Compliance
These screws feature precision Class 3A thread fit with UNC coarse threading (5/16"-18) and fully threaded design for optimal performance. Manufacturing complies with ASTM F835 specifications for mechanical properties and dimensional accuracy. The products are fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental and safety standards for industrial applications.
