S-91306A287 5/16"-18 x 1 3/4" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive 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 corrosion resistance with zinc plating, ensuring long-term reliability in harsh industrial environments
- Superior tensile strength of 120,000 psi for heavy-duty applications requiring maximum load-bearing capacity
- Precise Class 3A thread fit delivers secure, vibration-resistant fastening with minimal risk of loosening
- Fully threaded design provides consistent grip strength across the entire length for uniform clamping force
- Hex drive compatibility allows for high-torque installation with standard tools, reducing assembly time
- Rockwell C39 hardness ensures excellent wear resistance and durability under repetitive stress
- Coarse UNC threading enables quick installation and superior performance in softer materials
Professional Applications & Engineering Value
These 5/16"-18 UNC zinc-plated alloy steel screws are engineered to solve critical fastening challenges in demanding industrial settings. The combination of high tensile strength and Rockwell C39 hardness makes them ideal for applications where vibration resistance and structural integrity are paramount, such as heavy machinery assembly, construction equipment, and automotive frameworks. The rounded button head profile with hex drive provides both aesthetic appeal and practical installation advantages, while the coarse thread spacing ensures rapid assembly in various materials. The zinc-plated surface treatment offers reliable protection against corrosion, extending service life in outdoor or chemically aggressive environments where fastener failure is not an option.
Specification Summary & Compliance
These screws feature Class 3A thread fit precision with UNC coarse threading and full threading along the 1 3/4" length. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for safe and sustainable industrial components.
