S-91251A124 5-40 x 1/4" 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 in demanding applications.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life and maintaining integrity in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening in machinery and equipment.
- Coarse UNC threads enable quicker installation and easier alignment, saving time during assembly and maintenance operations.
- Full threading along the 1/4" length offers consistent grip and adjustability, allowing for versatile positioning in various components.
- Hex socket drive design with a 3/32" size facilitates efficient torque application in confined spaces, enhancing installation efficiency.
- High hardness of Rockwell C37 resists wear and deformation, ensuring long-term durability and reduced replacement costs.
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 corrosion in harsh environments. The 5-40 UNC coarse threads and Class 3A fit provide superior clamping force and stability, ideal for precision machinery, automotive assemblies, and heavy-duty equipment where reliability is critical. The fully threaded design ensures uniform stress distribution, reducing the risk of fatigue failures. With its high tensile strength and durable surface treatment, it excels in applications requiring repeated disassembly, offering long-term performance and compliance with industry standards for safety and efficiency.
Specification Summary & Compliance
This screw features precise inch system measurements, including a 1/4" length and 5-40 UNC coarse threads with a Class 3A thread fit for high accuracy. It meets ASTM A574 specifications for quality and performance, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and adherence to global industrial standards.
