S-91251A609 1 1/2"-12 x 5" 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 demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments and minimizing maintenance needs.
• Precise Class 2A thread fit guarantees smooth assembly and secure fastening, enhancing operational efficiency and reducing installation errors.
• Fine UNRF threads provide improved vibration resistance and better load distribution, ideal for machinery requiring stable, long-term connections.
• Partially threaded design allows for controlled clamping force and easier alignment, speeding up assembly in complex mechanical setups.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and durability through repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards for safety and environmental responsibility, supporting global supply chain requirements.

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, automotive systems, and construction equipment. The UNRF fine thread design enhances grip and resistance to loosening under vibration, a common issue in dynamic environments. With a 1 1/2"-12 thread size and Class 2A fit, it delivers precise torque transmission and minimizes the risk of cross-threading, reducing downtime. The partially threaded rod type allows for optimal stress distribution, preventing joint fatigue in high-load applications. Ideal for use with a 1" hex drive, it ensures easy installation in confined spaces, boosting productivity while maintaining the high tensile strength needed for safety-critical connections.

Specification Summary & Compliance

This socket head cap screw features a Class 2A thread fit with UNRF fine threads and a 1 1/2"-12 thread size, ensuring dimensional accuracy per industry standards. It is manufactured in compliance with ASTM A574 for consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and global industrial applications without hazardous substances.