S-91255A539 1/4"-20 x 5/8" 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 corrosion resistance from the black-oxide finish, ideal for demanding industrial environments.
- Superior strength and durability with 120,000 psi tensile strength and Rockwell C39 hardness for reliable, long-lasting fastening.
- Secure and efficient installation using the 5/32" hex drive, preventing cam-out and ensuring precise torque application.
- Optimal thread engagement and vibration resistance with the Class 3A thread fit and UNC coarse thread spacing.
- Full thread coverage along the 5/8" length for maximum grip and holding power in various material thicknesses.
- Compliance with major industry standards including ASME B18.3 and ASTM F835, ensuring consistent quality and performance.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting strict regulatory requirements.
Professional Applications & Engineering Value
This black-oxide alloy steel button head screw is engineered to solve critical fastening challenges in industrial settings. The black-oxide surface treatment provides a robust layer of protection against corrosion, significantly extending service life in humid or chemically exposed environments. Its high tensile strength (120,000 psi) and Rockwell C39 hardness ensure the fastener can withstand high stress and shock loads without failing, making it ideal for machinery, automotive assemblies, and heavy-duty equipment. The combination of a hex drive and fully threaded UNC coarse spacing allows for quick, secure installation and superior resistance to loosening under vibration. This design is particularly valuable in applications where disassembly for maintenance is required, offering a reliable and reusable fastening solution.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with a Class 3A thread fit for precise, high-quality engagement. It is manufactured to meet ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
