S-91251A961 1 1/2"-6 x 4 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in demanding environments.
• Full UNRC coarse threading with Class 2A fit allows for quick assembly and secure fastening, minimizing installation time and improving efficiency.
• Hex socket drive design offers superior torque transmission and access in confined spaces, enabling precise and stable installations.
• Rockwell C37 hardness delivers excellent wear resistance, maintaining integrity under repeated use and heavy loads.
• Compliance with ASTM A574, RoHS 3, and REACH standards guarantees material quality and environmental safety, supporting regulatory adherence in global markets.
• Fully threaded 4 1/2" length provides uniform clamping force and versatility across various joint thicknesses, simplifying inventory management.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors, where high tensile strength and durability are paramount. The UNRC coarse thread design ensures rapid engagement and reduced cross-threading risks, while the Class 2A fit maintains precise tolerances for consistent performance. The black-oxide surface treatment enhances corrosion resistance, making it ideal for harsh industrial environments. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme loads and vibrations, preventing loosening and extending equipment lifespan. This screw is a reliable choice for applications requiring robust, high-strength fastening solutions that comply with industry standards like ASTM A574.

Specification Summary & Compliance

This socket head cap screw features a 1 1/2"-6 UNRC coarse thread with Class 2A fit for standard dimensional accuracy, ensuring compatibility and ease of assembly. It is manufactured in accordance with ASTM A574 specifications, guaranteeing material and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its adherence to environmental and safety standards for hazardous substance restrictions.