S-91251A121 1/2"-13 x 7 1/2" 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, preventing fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
- Precise Class 3A thread fit provides secure, vibration-resistant connections, reducing the risk of loosening.
- Coarse UNRC threads enable quick and easy installation, saving time in assembly and maintenance.
- Partially threaded design allows for optimal clamping force control, ideal for components requiring specific grip ranges.
- Hex socket drive offers high torque transmission and tool accessibility in confined spaces.
- Compliance with ASTM A574 guarantees material and manufacturing consistency for dependable engineering use.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical industrial challenges, such as vibration-induced loosening and environmental degradation. The coarse UNRC thread and Class 3A fit ensure tight, secure fastening in heavy machinery, automotive assemblies, and construction equipment, where reliability is paramount. The partially threaded shank design allows for precise clamping without over-tightening, reducing stress concentrations. With a Rockwell C37 hardness and robust 170,000 psi tensile strength, it withstands extreme loads and repetitive use, minimizing downtime. The black-oxide surface treatment enhances corrosion resistance, making it suitable for outdoor or humid conditions, while the hex drive facilitates efficient installation in tight spaces, boosting productivity.
Specification Summary & Compliance
This socket head cap screw features a 1/2"-13 coarse UNRC thread with a Class 3A thread fit for high precision and minimal backlash. It adheres to ASTM A574 specifications for material and manufacturing quality, ensuring consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental safety and regulatory requirements in global markets.
