S-91263A575 5/16"-18 x 1" 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
- Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress conditions
- Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh environments
- Precise Class 3A thread fit provides excellent engagement and vibration resistance in critical assemblies
- 82° countersink angle allows for flush mounting and clean finished appearance in various applications
- Hex drive design with 3/16" size enables secure installation and high torque capability
- Alloy steel construction with Rockwell C39 hardness delivers outstanding durability and wear resistance
- Full threading along the 1" length ensures maximum holding power throughout the fastener
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws are engineered to solve critical fastening challenges in industrial environments. The zinc-plated alloy steel construction provides exceptional corrosion protection while maintaining 130,000 psi tensile strength, making them ideal for machinery, equipment manufacturing, and structural applications where vibration resistance is crucial. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of loosening under dynamic loads. The 82° countersink angle and flat head design create seamless surfaces in countersunk holes, perfect for applications requiring aerodynamic profiles or smooth finishes. These fully threaded screws with coarse UNC threading provide rapid installation and superior holding power in various materials, from steel to aluminum assemblies.
Specification Summary & Compliance
This flat head screw features precise 5/16"-18 UNC coarse threading with Class 3A fit tolerance for optimal performance. Manufactured to meet ASTM F835 specifications for mechanical properties and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) standards, ensuring environmental responsibility and workplace safety. The inch system measurement guarantees compatibility with North American industrial standards and specifications.
