S-91251A616 1 1/4"-12 x 2 1/2" 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.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, non-reflective finish suitable for harsh industrial environments.
• Fine UNRF thread with Class 2A fit offers precise engagement and vibration resistance, maintaining secure fastening in machinery and equipment.
• Fully threaded design allows for consistent clamping force along the entire length, ideal for adjustable or deep-set assemblies.
• High hardness (Rockwell C37) increases wear resistance and extends service life, minimizing replacement needs and downtime.
• 7/8" hex drive and standard socket head enable easy installation with common tools, improving assembly efficiency and reducing labor time.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting global regulatory standards for industrial use.

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 structural frameworks. The fine UNRF thread and Class 2A fit provide superior resistance to loosening under vibration, a common issue in dynamic equipment. Made from high-strength alloy steel with a Rockwell C37 hardness, it withstands extreme loads and repetitive stress, reducing maintenance frequency. The fully threaded right-hand design ensures uniform load distribution, while the black-oxide surface treatment adds corrosion protection without compromising dimensional accuracy. Ideal for applications requiring precise torque and durability, this screw delivers reliable performance in industrial fasteners where safety and longevity are paramount.

Specification Summary & Compliance

This socket head cap screw features a 1 1/4"-12 UNRF fine thread with Class 2A dimensional tolerance for consistent fit and performance. It is manufactured in accordance with ASTM A574 specifications, ensuring material integrity and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use worldwide.