S-91255A582 5/16"-18 x 7/8" 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 durability and corrosion resistance due to the black-oxide coating on alloy steel, extending service life in harsh industrial environments.
- Superior load-bearing capacity with a tensile strength of 120,000 psi, ensuring reliable performance under high-stress conditions.
- Precise and secure fastening achieved through Class 3A thread fit, minimizing the risk of loosening in critical assemblies.
- Efficient installation and removal with a 3/16" hex drive, allowing for high torque application without slippage.
- Wide compatibility and easy alignment thanks to the UNC coarse thread and rounded button head design, simplifying assembly in various materials.
- Full threading for maximum grip along the 7/8" length, providing consistent clamping force across the entire fastener.
- Compliance with major industry standards including ASME B18.3 and ASTM F835, ensuring quality and interoperability in professional applications.
Professional Applications & Engineering Value
This 5/16"-18 UNC Rounded Head Screw is engineered to address common industrial challenges such as vibration-induced loosening and environmental degradation. The black-oxide alloy steel construction offers enhanced resistance to rust and wear, making it ideal for machinery, automotive, and structural assemblies exposed to moisture or chemicals. Its Class 3A thread fit and coarse threading ensure quick installation and reliable holding power in softer materials or where disassembly is frequent. The hex drive and button head design facilitate access in confined spaces, reducing assembly time and improving workflow efficiency in maintenance and production lines.
Specification Summary & Compliance
This screw features a Class 3A thread fit with UNC coarse threads, ensuring high precision and interchangeability. It complies with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various industrial sectors.
