S-91251A594 5/16"-18 x 2 3/4" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head 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 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- Partially threaded design allows for controlled clamping force and easier alignment in assemblies requiring unthreaded shank sections.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- 1/4" hex drive compatibility enables easy installation with standard tools, speeding up assembly processes.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial use.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. The UNC coarse thread and Class 3A fit provide superior holding power in dynamic applications, from heavy machinery to automotive assemblies. The partially threaded rod type allows precise engagement in tapped holes, reducing stress concentration. With a high tensile strength and corrosion-resistant coating, it excels in demanding sectors like manufacturing and construction, where reliability and longevity are critical. Its compliance with ASTM A574 ensures consistent performance, making it a trusted choice for engineers seeking durable fastening solutions.
Specification Summary & Compliance
This socket head cap screw features a 5/16"-18 UNC thread with Class 3A precision for accurate fit, a 2 3/4" length, and partially threaded design. It meets ASTM A574 specifications for material quality, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for industrial use worldwide.
