S-91251A105 4-40 x 3/16" 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 provides reliable, high-load performance in demanding industrial applications.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh environments.
- Precise Class 3A thread fit ensures smooth installation and secure fastening, reducing assembly time and improving joint integrity.
- Fully threaded design offers consistent engagement along the entire length for versatile and adjustable clamping force.
- High hardness (Rockwell C37) enhances wear resistance and durability, minimizing thread damage during repeated use.
- Standard hex socket drive allows for easy installation with common tools, facilitating efficient maintenance and assembly.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial standards.
Professional Applications & Engineering Value
This 4-40 UNC thread socket head cap screw is engineered to address critical challenges in precision machinery, automotive, and aerospace assemblies. The black-oxide alloy steel construction combats corrosion and wear, while the coarse thread spacing and Class 3A fit provide reliable fastening in high-vibration environments. Its fully threaded design ensures uniform stress distribution, reducing the risk of loosening. Ideal for compact spaces, the hex drive enables secure torque application, making it a top choice for industrial fasteners requiring high strength and durability without compromising on regulatory compliance.
Specification Summary & Compliance
This screw adheres to inch system measurement with a Class 3A thread fit and UNC coarse thread for precise dimensional accuracy. Manufactured to meet 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, supporting safe and sustainable industrial use.
