S-91251A024 1/2"-20 x 3" 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 provides superior resistance to breaking and stripping under extreme loads.
- Class 3A thread fit ensures precise, tight-tolerance engagement for secure fastening in critical applications.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance for extended service life in demanding environments.
- Partially threaded design allows for focused clamping force and easier alignment in assembly operations.
- 3/8" hex drive socket head enables high-torque installation with standard tools, reducing the risk of cam-out.
- Rockwell C37 hardness provides excellent wear resistance and durability against repeated use.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees 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 solve critical fastening challenges in high-stress industrial environments. The 1/2"-20 UNF fine thread and Class 3A fit deliver superior vibration resistance and clamping force in machinery, automotive assemblies, and heavy equipment. The partially threaded rod type concentrates stress away from the head, reducing the risk of fatigue failure. Combined with a 170,000 psi tensile strength and corrosion-resistant black-oxide surface treatment, it ensures long-term reliability in applications where precision, durability, and compliance with ASTM A574 standards are non-negotiable for operational safety and efficiency.
Specification Summary & Compliance
This socket head cap screw features a 1/2"-20 UNF fine thread with a Class 3A thread fit for high precision. It is manufactured from alloy steel with a black-oxide finish, meeting ASTM A574 specifications for quality assurance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industrial and international markets.
