S-91255A387 5/16"-24 x 1 1/4" 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 tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
- Black-oxide finish on alloy steel enhances corrosion resistance and durability, extending service life in demanding industrial environments.
- Fully threaded design allows for maximum grip and load distribution along the entire length, improving joint integrity.
- Hex drive with rounded button head offers easy installation and a low-profile, aesthetically clean finish that minimizes snagging.
- Rockwell C39 hardness ensures high wear resistance, maintaining thread integrity through repeated use and disassembly.
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability in regulated industrial applications.
Professional Applications & Engineering Value
This 5/16"-24 UNF rounded head screw is engineered to address common industrial challenges such as vibration loosening and corrosion in heavy-duty assemblies. The black-oxide alloy steel construction provides a robust barrier against environmental factors, while the fine thread spacing and Class 3A fit ensure precise engagement in components requiring high clamping force, like machinery frames, automotive systems, and precision equipment. Its fully threaded and hex drive design simplifies installation in confined spaces, reducing assembly time and enhancing reliability for maintenance-critical operations.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit per UNF standards, with dimensions including a 1 1/4" length and fine thread spacing. It meets 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, ensuring environmental safety and regulatory adherence in global supply chains.
