S-91251A406 6-40 x 1/4" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable finish, extending service life in harsh environments.
- Fine UNF thread design allows for finer adjustments and improved load distribution, ideal for precision engineering components.
- Fully threaded shank ensures consistent gripping strength along the entire length, facilitating versatile installation in various material thicknesses.
- Hex socket drive (7/64") enables easy installation with standard tools, reducing assembly time and minimizing strip-out risks.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations, ensuring safe and reliable use.
Professional Applications & Engineering Value
This 6-40 UNF thread socket head cap screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. Constructed from black-oxide alloy steel with a Rockwell C37 hardness, it withstands high tensile loads and corrosive conditions, making it ideal for precision machinery, automotive assemblies, and aerospace components. The fine thread and Class 3A fit ensure secure fastening in dynamic environments, reducing maintenance needs and enhancing operational reliability. Its fully threaded design and hex drive simplify installation in confined spaces, boosting efficiency in B2B procurement for demanding applications.
Specification Summary & Compliance
This screw features a 6-40 UNF fine thread with Class 3A thread fit for high precision, and dimensions including a 1/4" length, 0.226" head diameter, and 7/64" hex drive. It meets ASTM A574 specifications for material quality, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.
