S-91251A207 8-32 x 2 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi for reliable performance in high-stress industrial applications.
• Superior corrosion resistance with black-oxide coating, extending service life in demanding environments.
• Precise Class 3A thread fit ensures secure, vibration-resistant connections and easy assembly.
• High hardness rating (Rockwell C37) provides excellent wear resistance and durability.
• Hex socket drive design allows for high torque application and secure installation in confined spaces.
• Partially threaded shank offers optimal grip and clamping force for varied material thicknesses.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety standards.

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 loosening and material fatigue. The 8-32 UNC coarse thread and Class 3A fit provide superior holding power in metals and plastics, reducing the risk of strip-out. With a minimum thread length of 7/8" and partial threading, it ensures consistent clamping across joints of varying depths. The hex drive socket enables efficient installation in tight spaces, making it ideal for machinery, automotive, and heavy equipment applications where reliability and high tensile strength (170,000 psi) are paramount.

Specification Summary & Compliance

This screw adheres to inch system measurements with a 2-1/2" length and Class 3A thread fit per UNC standards, ensuring dimensional accuracy. It meets ASTM A574 specifications for alloy steel socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial use without hazardous substances.