S-91251A876 6-32 x 2 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi provides superior load-bearing capacity and resistance to failure in high-stress applications.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance, extending the screw's service life in various industrial environments.
• Class 3A thread fit ensures precise, secure mating with nuts and tapped holes, minimizing the risk of loosening under vibration.
• Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
• Rockwell C37 hardness guarantees excellent wear resistance and durability, maintaining performance over repeated use.
• Coarse UNC threads enable quicker assembly and are less prone to clogging in dirty or debris-filled applications.
• Partial threading provides an unthreaded shoulder for precise clamping and alignment in assembled components.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in industrial assembly, such as vibration-induced loosening and material fatigue. The 6-32 UNC coarse thread with a Class 3A fit ensures reliable engagement in high-vibration environments like machinery, automotive systems, and heavy equipment. The alloy steel construction combined with 170,000 psi tensile strength provides a robust solution for applications requiring high clamping force and structural integrity. The black-oxide surface treatment not only resists corrosion but also reduces galling during installation, making it ideal for maintenance-heavy sectors. Its partially threaded design offers precise positioning, reducing the need for additional components and streamlining assembly processes in OEM and MRO settings.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a coarse UNC thread form. It is manufactured in compliance with ASTM A574 specifications, ensuring consistent quality and performance. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, confirming its suitability for use in environmentally conscious and global industrial markets.