S-91251A863 3/4"-10 x 8" 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 industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive engagement through repeated use.
• Coarse UNRC threading allows for quicker installation and easier alignment, saving time in assembly and maintenance operations.
• 5/8" hex drive design enables high-torque application with standard tools, ensuring tight fastening without stripping the socket.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting rigorous industry and regulatory standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, construction equipment, and automotive systems. The alloy steel construction, combined with a Rockwell C37 hardness, provides exceptional durability against mechanical stress and abrasion, reducing downtime from wear-related failures. The UNRC coarse thread and Class 3A fit ensure reliable engagement in materials where fine threads might strip, offering vibration resistance in dynamic applications. With a partially threaded design, it allows for precise clamping force distribution, ideal for securing components like brackets, frames, and hydraulic systems. The black-oxide surface treatment enhances corrosion resistance, making it suitable for outdoor or humid environments without compromising the 170,000 psi tensile strength. This fastener delivers consistent performance in demanding scenarios, from manufacturing plants to infrastructure projects, where socket head accessibility and high-strength requirements are paramount.

Specification Summary & Compliance

This socket head cap screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNRC coarse threading with a size of 3/4"-10. It is manufactured in accordance with ASTM A574 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in environments with strict environmental and health standards.