S-91251A031 1/2"-20 x 5" 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.
- Corrosion-resistant black-oxide finish on alloy steel enhances durability and provides protection in harsh industrial environments.
- Precise Class 3A thread fit offers superior engagement and vibration resistance, maintaining tight connections in critical assemblies.
- 3/8" hex drive design allows for easy installation and removal with standard tools, minimizing assembly time and effort.
- Partially threaded shank provides optimal clamping force distribution, ideal for applications requiring precise joint control.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chain integration.
- Fine UNRF threads deliver improved fatigue resistance and sealing capabilities in dynamic or high-vibration settings.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws address common challenges such as joint loosening and material degradation. The Class 3A UNRF fine threads provide excellent resistance to vibrational loosening, making them ideal for machinery, automotive, and heavy equipment assemblies. The high tensile strength and Rockwell C37 hardness ensure longevity under repetitive loads, while the partially threaded design allows for precise clamping in structural components. Suitable for use in inch-based systems, these fasteners offer reliable performance in environments requiring strict adherence to ASTM A574 specifications and regulatory compliance.
Specification Summary & Compliance
This product meets Class 3A thread fit tolerances for precise engagement, manufactured in accordance with ASTM A574 standards. It features 1/2"-20 UNRF fine threads with a minimum thread length of 1 1/2" and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in industrial and international markets.
