S-91251A718 1/2"-13 x 1 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.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial conditions.
• Fully threaded design allows for maximum adjustability and uniform clamping force along the entire length.
• Hex socket drive enables easy installation in confined spaces with high torque transfer, improving assembly efficiency.
• Rockwell C37 hardness ensures excellent wear resistance and durability under repeated loads.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 1/2"-13 UNC Socket Head Cap Screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors. The black-oxide alloy steel construction combats rust and wear, while the coarse UNC threads and Class 3A fit ensure quick assembly and secure fastening in high-vibration environments. Its fully threaded body distributes load evenly, preventing stress concentration and joint failure. Ideal for applications requiring high tensile strength and durability, such as engine mounts and structural frames, this screw enhances operational reliability and reduces maintenance downtime.

Specification Summary & Compliance

This socket head cap screw features a 1/2"-13 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances and consistent performance. It meets ASTM A574 specifications for alloy steel socket head cap screws, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use.