S-91251A159 6-32 x 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.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
• Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
• Partially threaded shank offers optimal grip and alignment, preventing loosening in dynamic applications.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties for critical engineering uses.
• Rockwell C37 hardness ensures excellent wear resistance and durability over repeated use cycles.

Professional Applications & Engineering Value

These 6-32 UNC thread socket head cap screws are engineered to address common industrial fastening challenges, such as vibration-induced loosening and corrosion in harsh environments. The black-oxide alloy steel construction provides a protective layer that resists oxidation, making them ideal for machinery, automotive, and aerospace assemblies where exposure to moisture or chemicals is a concern. The coarse thread spacing and Class 3A thread fit ensure quick installation and a secure hold, reducing maintenance downtime. With a partially threaded design, they offer precise clamping force distribution, preventing joint failure in high-vibration applications like engine components or heavy equipment. These screws deliver reliable performance, meeting the demands of industrial fasteners that require both strength and compliance with environmental regulations.

Specification Summary & Compliance

This product adheres to UNC thread standards with a Class 3A thread fit for high precision. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free from hazardous substances, supporting sustainable and safe industrial use.