S-91251A369 7/16"-20 x 3 3/4" ASTM A574 Alloy Steel Socket Head Screws

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.
• Precision Class 3A thread fit provides secure, vibration-resistant connections for critical assemblies requiring exact tolerances.
• High hardness rating (Rockwell C37) enhances wear resistance and durability under repeated loading and disassembly.
• Fine UNF threading offers improved adjustment control and superior clamping force compared to coarse threads.
• Hex socket drive design allows for high-torque installation in confined spaces, speeding up assembly processes.
• Compliance with ASTM A574 and environmental regulations guarantees consistent quality and safe use in regulated industries.

Professional Applications & Engineering Value

These 7/16"-20 UNF socket head cap screws are engineered for demanding applications where precision and reliability are non-negotiable. The black-oxide alloy steel construction provides excellent corrosion resistance, making them ideal for machinery, automotive, and aerospace components exposed to moisture or chemicals. The fine thread and Class 3A fit ensure minimal backlash and superior clamping in high-vibration environments, such as engine mounts or precision instruments. With a partially threaded design, they offer optimal grip length for joint integrity without unnecessary thread engagement, reducing stress concentrations. These screws deliver long-term performance in heavy-duty industrial settings, backed by rigorous standards compliance.

Specification Summary & Compliance

This socket head cap screw features a 7/16"-20 UNF fine thread with Class 3A tolerance for precise fit, a 3/4" length, and partially threaded rod type. It meets ASTM A574 specifications for high-strength alloy steel fasteners and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use.