S-91255A522 1/4"-20 x 5/16" 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 with Rockwell C39 hardness and 120,000 psi tensile strength, ensuring reliable performance in high-stress industrial environments.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding applications.
- Precise thread engagement with Class 3A UNC coarse threads, providing secure fastening and reduced risk of cross-threading.
- Easy installation and removal using a standard 5/32" hex drive, saving time and labor in assembly processes.
- Full threading along the 5/16" length for maximum grip and uniform load distribution in various materials.
- Compliance with ASME B18.3 and ASTM F835 standards, guaranteeing consistent quality and interoperability in mechanical systems.
- Environmentally responsible design meeting RoHS 3 and REACH regulations, supporting sustainable procurement practices.
Professional Applications & Engineering Value
This black-oxide alloy steel rounded head hex screw is engineered to address common industrial challenges, such as vibration loosening and material fatigue. The Class 3A UNC coarse thread ensures quick assembly and high resistance to stripping, ideal for machinery, automotive, and heavy equipment where reliability is critical. Its fully threaded design and 120,000 psi tensile strength provide robust clamping force, reducing maintenance needs in dynamic environments. The button head style offers a low-profile finish, minimizing protrusion in confined spaces while the hex drive facilitates efficient torque application. By adhering to ASME B18.3 and ASTM F835, this screw delivers consistent performance, enhancing the longevity and safety of industrial assemblies.
Specification Summary & Compliance
This product features precise Class 3A thread fit with UNC coarse spacing and a right-hand thread direction, ensuring dimensional accuracy for secure fastening. It complies with ASME B18.3 and ASTM F835 manufacturing specifications, and meets environmental standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) for hazardous substance restrictions.
