S-91251A539 1/4"-20 x 5/8" 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 on alloy steel prolongs service life in demanding industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
- Hex socket drive design allows for easy installation and removal with standard tools, improving assembly efficiency.
- Fully threaded right-hand UNRC coarse thread enables quick engagement and strong holding power in various materials.
- High hardness (Rockwell C37) enhances durability and wear resistance, supporting long-term operational reliability.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chain integration.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion. The Class 3A thread fit and coarse UNRC threads provide excellent grip and alignment in machinery, automotive, and construction assemblies, reducing maintenance needs. With a high tensile strength of 170,000 psi and Rockwell C37 hardness, it withstands heavy loads and harsh conditions, making it ideal for applications requiring dependable fastening solutions. The hex drive design facilitates quick installation in confined spaces, enhancing productivity while meeting strict ASTM A574 standards for consistent performance.
Specification Summary & Compliance
This screw features a 1/4"-20 thread size with Class 3A fit and coarse UNRC threads for precise engagement. It complies with ASTM A574 specifications for material and manufacturing quality, and is verified as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations without hazardous substances.
