S-91251A960 1 1/2"-6 x 6" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish protects against rust and extends service life in harsh industrial environments.
• High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated assembly and disassembly.
• Coarse UNRC threads enable faster installation and better debris resistance, ideal for quick assembly in rugged conditions.
• 1" hex drive and standard socket head offer secure tool engagement and high torque application, minimizing stripping and improving installation efficiency.
• Partially threaded design allows for precise clamping force control, ensuring stable connections in structural and machinery assemblies.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global industrial standards.

Professional Applications & Engineering Value

Engineered for heavy-duty fastening in critical applications, these Black-Oxide Alloy Steel Socket Head Cap Screws address common industrial challenges such as vibration loosening and environmental degradation. The coarse UNRC thread design enhances grip in soft materials and resists clogging, while the high tensile strength and Rockwell C37 hardness prevent deformation under stress. Ideal for machinery, construction, and automotive assemblies, the partially threaded configuration ensures accurate load distribution, reducing the need for frequent maintenance. The black-oxide surface treatment adds a protective layer against moisture and chemicals, extending the fastener's lifespan in corrosive settings. This combination of material durability and precision engineering delivers reliable performance in high-stress environments, optimizing operational efficiency and safety.

Specification Summary & Compliance

This Socket Head Cap Screw features a 1 1/2"-6 UNRC coarse thread with Class 2A thread fit for standard tolerance and easy assembly. It meets ASTM A574 specifications for high-strength alloy steel, ensuring consistent manufacturing quality. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it adheres to environmental and safety standards, making it suitable for global industrial use. Dimensions include a 6" length, 1" hex drive, and 2 1/4" head diameter, designed for precise application in various engineering contexts.