S-91251A546 1/4"-20 x 1 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.
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in various industrial environments.
• Precise Class 3A thread fit offers tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening in machinery and equipment.
• Hex socket drive design allows for high-torque installation in confined spaces, improving assembly efficiency and reducing tool slippage.
• Partially threaded shank enables precise clamping force control, ideal for applications where specific grip length is critical.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties, ensuring reliability in professional and industrial settings.
• RoHS 3 and REACH compliance ensures environmental and regulatory safety, making these screws suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws are engineered to address common industrial challenges such as vibration-induced loosening and corrosion in harsh environments. The coarse 1/4"-20 thread with a Class 3A fit provides excellent holding power in materials like steel and aluminum, reducing the need for frequent maintenance in machinery, automotive assemblies, and construction equipment. The hex drive and standard socket head profile facilitate easy installation with standard tools, even in tight spaces, while the partial threading allows for optimized load distribution. Ideal for high-stress applications, these screws deliver consistent performance in manufacturing, aerospace, and heavy equipment sectors, where tensile strength and durability are paramount.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for precise dimensional accuracy, ensuring reliable engagement and minimal backlash. Manufactured in compliance with ASTM A574 specifications, it meets rigorous standards for material consistency and mechanical properties. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental regulations for hazardous substance restrictions and safe use in industrial applications.