S-91205A579 5/16"-18 x 5/8" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide finish, ideal for harsh industrial environments.
• High tensile strength of 170,000 psi ensures reliable performance under extreme mechanical stress.
• Nylon Patch thread locker provides vibration-resistant locking from -70° to 250°F, preventing loosening.
• Precision Class 3A thread fit guarantees tight tolerances and smooth assembly in demanding applications.
• Rockwell C37 hardness offers superior durability and wear resistance for long service life.
• 1/4" hex drive socket head allows for easy installation with standard tools in confined spaces.
• Coarse UNC thread enables quick engagement and reduced cross-threading risks.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in industrial settings, such as vibration-induced failures and corrosion. The Nylon Patch thread locker ensures secure fastening in machinery subjected to dynamic loads, while the high tensile strength and Rockwell C37 hardness provide resilience in heavy-duty applications like automotive assemblies, aerospace components, and manufacturing equipment. Its coarse UNC thread and Class 3A fit facilitate rapid installation with minimal risk of stripping, enhancing productivity. Compliant with ASME B18.3 and ASTM A574, it delivers consistent performance in environments requiring precision and reliability.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 3A precision fit, ensuring dimensional accuracy and compatibility. It meets ASME B18.3 and ASTM A574 manufacturing specifications, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable industrial practices.