S-91255A581 5/16"-18 x 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 durability and strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance in demanding industrial environments.
- Superior corrosion resistance thanks to the black-oxide finish on alloy steel, extending service life in harsh conditions.
- Secure and efficient installation with a 3/16" hex drive that prevents cam-out and ensures tight fastening.
- Optimized thread engagement featuring fully threaded UNC coarse spacing and Class 3A fit for quick assembly and vibration resistance.
- Versatile rounded button head design provides a low-profile, aesthetically pleasing finish while reducing snagging risks.
- Broad compliance with industry standards including ASME B18.3 and ASTM F835, ensuring consistent quality and interoperability.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for safe use.
Professional Applications & Engineering Value
This 5/16"-18 UNC black-oxide alloy steel rounded head screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and high-stress fatigue. The alloy steel construction combined with a black-oxide surface treatment offers enhanced protection against rust and wear, making it ideal for machinery, automotive assemblies, and outdoor equipment. Its fully threaded coarse UNC spacing and Class 3A thread fit ensure rapid installation and reliable holding power in materials where fine threads might strip. The hex drive allows for high-torque application without slippage, reducing assembly time and maintenance needs in industrial screw applications requiring high tensile strength and long-term reliability.
Specification Summary & Compliance
This screw features precise Class 3A thread fit with UNC coarse spacing and right-hand threading, ensuring tight tolerances for secure fastening. It adheres to ASME B18.3 and ASTM F835 specifications, guaranteeing dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for global industrial use.
