S-91251A413 6-40 x 3/4" 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 under high-stress conditions, reducing the risk of fastener failure.
- Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance for extended service life in demanding environments.
- Rockwell C37 hardness delivers excellent wear resistance, maintaining thread integrity through repeated use.
- Fully threaded 6-40 UNF fine thread design allows for maximum adjustability and holding power in fine-pitch applications.
- Hex socket drive (7/64") enables high-torque installation with minimal risk of cam-out, ensuring secure fastening.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for regulated industries.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and high-load demands. The 6-40 UNF fine thread with Class 3A fit ensures tight tolerances and reliable performance in precision equipment, automotive assemblies, and machinery where fine adjustment and secure fastening are critical. The fully threaded design provides consistent clamping force along the entire length, while the hex drive allows for efficient installation in confined spaces. Ideal for applications requiring high tensile strength and durability, this fastener meets the rigorous demands of aerospace, manufacturing, and electronic enclosures, reducing maintenance cycles and improving operational reliability.
Specification Summary & Compliance
This socket head cap screw features a 6-40 UNF thread with Class 3A precision fit and a length of 3/4 inch. Manufactured in accordance with 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 its suitability for use in environmentally conscious and regulated industries without hazardous substances.
