S-91251A485 5/8"-18 x 2 3/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide coating on alloy steel extends service life in harsh industrial environments.
• Precise Class 3A thread fit guarantees tight, secure connections with minimal play, enhancing assembly accuracy and vibration resistance.
• Partially threaded design with fine UNRF threads allows for optimal grip and alignment, preventing loosening under dynamic loads.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
• 1/2" hex drive compatibility enables easy installation with standard tools, streamlining maintenance and reducing downtime.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards for safety and environmental responsibility.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these socket head cap screws with black-oxide alloy steel construction address critical challenges like corrosion and mechanical stress. The fine UNRF threads and Class 3A fit deliver superior clamping force and alignment in machinery, automotive, and heavy equipment assemblies, minimizing the risk of thread stripping or misalignment. With a partially threaded shank, they provide focused engagement in bolted joints, enhancing stability in high-vibration environments. This design, combined with high tensile strength, ensures long-term reliability in applications where precision and durability are paramount, reducing maintenance costs and downtime.

Specification Summary & Compliance

This fastener features a 5/8"-18 UNRF thread with Class 3A fit for precise dimensional accuracy, adhering to ASTM A574 specifications for quality assurance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and regulatory adherence in industrial use.