S-91251A213 2-56 x 1/16" 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 extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, enhancing assembly reliability.
- High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threads enable quicker installation and better performance in materials where fine threads might strip.
- Compact 1/16" length and standard socket head allow for easy access in confined spaces with standard hex tools.
- Full compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws are engineered to address critical challenges in precision assemblies where space is limited and reliability is paramount. The UNC coarse thread design ensures rapid installation and robust holding power in softer materials or applications subject to vibration, reducing assembly time and improving operational efficiency. With a 170,000 psi tensile strength and Rockwell C37 hardness, they prevent stripping and deformation under heavy loads, making them ideal for machinery, automotive components, and electronic enclosures. The black-oxide surface treatment provides a durable barrier against moisture and chemicals, extending service life in demanding environments while meeting strict industry standards for quality and safety.
Specification Summary & Compliance
This fastener features a 2-56 UNC coarse thread with Class 3A fit for precise dimensional accuracy and secure fastening. It is fully threaded and right-hand oriented, manufactured in compliance with ASTM A574 specifications for high-strength socket head cap screws. The product is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets environmental and health safety regulations for industrial use worldwide.
