S-91251A378 5/16"-24 x 1/2" ASTM A574 Alloy Steel Socket Head Screws

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 in critical assemblies.
• Superior thread precision with Class 3A fit provides consistent, vibration-resistant connections, minimizing loosening in dynamic applications.
• Corrosion-resistant black-oxide finish on alloy steel enhances durability and provides a protective layer against rust in harsh industrial environments.
• Fine UNF threading offers improved load distribution and finer adjustment capabilities compared to coarse threads, ideal for precision equipment.
• Fully threaded design allows for maximum grip along the entire length, ensuring secure fastening in a variety of material thicknesses.
• Hex socket drive enables high-torque installation with standard tools, reducing stripping and improving assembly efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency, environmental safety, and adherence to international quality standards.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these socket head cap screws in black-oxide alloy steel address common challenges like vibration-induced loosening and corrosion. The Class 3A fine UNF threads deliver precise, tight fits in machinery, automotive, and aerospace assemblies, where accuracy is critical. With a Rockwell C37 hardness and high tensile strength, they withstand extreme loads without deformation, reducing maintenance needs. The fully threaded right-hand design ensures uniform stress distribution, making them ideal for securing components in tight spaces. Their compliance with ASTM A574 and environmental regulations like RoHS and REACH provides assurance for global supply chains, supporting long-term reliability in OEM and MRO applications.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNF standards, ensuring tight tolerances for secure fastening. Dimensions include a 5/16"-24 thread size, 1/2" length, and standard hex drive. It conforms to ASTM A574 for material and manufacturing quality, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) for environmental safety, with no SVHC above threshold levels as of the specified date.