S-91251A184 8-32 x 2 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, non-reflective finish suitable for harsh environments.
• Class 3A thread fit offers superior precision and tight tolerances for secure, vibration-resistant assemblies in critical applications.
• Partially threaded design allows for precise clamping force control and easier alignment in assemblies with unthreaded sections.
• Hex socket drive (9/64") enables high-torque installation with standard tools, minimizing stripping and ensuring consistent fastening.
• Coarse UNRC threads facilitate quick installation and improved grip in a variety of materials, boosting assembly efficiency.
• Rockwell C37 hardness provides excellent wear resistance and durability, extending the screw's service life in demanding uses.

Professional Applications & Engineering Value

This 8-32 thread socket head cap screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The black-oxide alloy steel construction, combined with a Class 3A thread fit, ensures precise, secure fastening in machinery, automotive, and aerospace assemblies where reliability is critical. The coarse thread spacing and partially threaded rod design allow for faster installation and reduced risk of cross-threading, while the high tensile strength and hardness resist deformation under load. Ideal for applications requiring robust, right-hand thread fasteners that meet stringent performance standards, this screw delivers consistent results in high-stress environments.

Specification Summary & Compliance

This screw features a 2-1/4" length with a minimum thread length of 7/8", UNRC coarse threads, and a Class 3A thread fit for precise dimensional accuracy. It complies with ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.