S-91251A294 1/4"-20 x 5 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 prolongs service life in harsh industrial environments.
- Precise Class 3A thread fit provides tight, secure fastening with minimal play, enhancing assembly accuracy.
- Hex socket drive design allows for easy installation in confined spaces with standard tools, improving efficiency.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity over repeated use.
- Partially threaded shank enables optimal grip and alignment, ideal for applications requiring controlled clamping force.
- Compliance with ASTM A574, RoHS, and REACH ensures material quality and environmental safety for global supply chains.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical fastening challenges in demanding sectors such as machinery, automotive, and heavy equipment. The UNC coarse thread and Class 3A fit provide superior vibration resistance and ease of assembly, reducing the likelihood of loosening under dynamic loads. With a high tensile strength of 170,000 psi and Rockwell C37 hardness, it withstands extreme mechanical stresses, while the black-oxide surface treatment enhances durability against moisture and chemicals. The hex drive and partially threaded design allow for precise torque application and secure joint integrity, making it a reliable choice for structural and industrial applications where performance and longevity are paramount.
Specification Summary & Compliance
This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for high precision and consistent performance. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring material and manufacturing quality. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible usage in various industries.
