S-91251A540 1/4"-20 x 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 in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish prolongs service life in harsh environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity during repeated installations and removals.
- Hex socket drive design allows for easy installation in confined spaces with standard tools, improving efficiency and reducing assembly time.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting rigorous industry standards.
- Coarse UNRC threads enable quick engagement and disassembly, ideal for applications requiring frequent adjustments or maintenance.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges, such as vibration-induced loosening and environmental corrosion. The Class 3A thread fit and coarse UNRC threads provide superior clamping force and ease of use in heavy machinery, automotive assemblies, and precision equipment. Its high tensile strength and Rockwell C37 hardness ensure durability under dynamic loads, making it suitable for demanding applications like aerospace components and construction machinery. The hex socket drive facilitates secure torque application in tight spaces, reducing installation errors and enhancing operational reliability.
Specification Summary & Compliance
This screw features a 1/4"-20 thread size with Class 3A precision tolerance and coarse thread spacing, manufactured to ASTM A574 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for industrial use.
