S-91251A081 2-56 x 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 provides reliable performance in high-stress applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel offers superior corrosion resistance, extending service life in demanding industrial environments.
- Class 3A thread fit ensures precise, secure mating with nuts and tapped holes, minimizing assembly issues and improving joint integrity.
- Fully threaded right-hand design with UNC coarse spacing allows for faster installation and higher resistance to vibration loosening.
- Hex socket drive (5/64") and standard socket head profile enable easy installation in confined spaces with common tools, reducing assembly time.
- Rockwell C37 hardness maintains dimensional stability under load, preventing deformation and ensuring repeated usability.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial supply chains.
Professional Applications & Engineering Value
This 2-56 UNC thread socket head cap screw is engineered to address critical challenges in precision machinery, automotive assemblies, and electronic enclosures where space constraints and vibration resistance are paramount. The black-oxide alloy steel construction combats rust and wear, while the fully threaded right-hand design with coarse spacing ensures rapid, secure fastening that withstands dynamic loads. Its high tensile strength (170,000 psi) and Rockwell C37 hardness provide durability in high-stress points, reducing maintenance needs. Ideal for industrial applications requiring reliable, compliant fasteners, it supports efficient production with consistent hex drive performance.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for precise UNC threading, with dimensions including a 1/2" length and 5/64" hex drive. Manufactured under ASTM A574 specifications, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for international industrial use.
