S-91251A765 1"-14 x 3 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi for reliable performance in high-stress applications and heavy machinery.
• Superior corrosion resistance provided by the black-oxide coating, extending service life in harsh industrial environments.
• Precise Class 3A thread fit ensures tight, secure fastening with minimal risk of loosening under vibration.
• Fine thread spacing (UNRF) offers improved adjustment control and better load distribution compared to coarse threads.
• High hardness (Rockwell C37) enhances wear resistance and durability, reducing the need for frequent replacements.
• Fully threaded design allows for maximum grip and versatility across various material thicknesses.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in demanding sectors such as heavy machinery, automotive assembly, and precision equipment manufacturing. The fine UNRF thread and Class 3A fit provide superior clamping force and vibration resistance, preventing joint failure in dynamic loads. The black-oxide surface treatment not only enhances corrosion protection but also reduces friction during installation, facilitating smoother torque application. With a 3/4" hex drive and standard socket head profile, it ensures easy access and secure tightening in confined spaces, making it ideal for applications requiring high-strength, reliable fastening without compromising on durability or regulatory compliance.

Specification Summary & Compliance

This socket head cap screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNRF fine thread specifications. It meets ASTM A574 for material and manufacturing consistency, ensuring high tensile strength and hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in environmentally sensitive and international markets.