S-91301A190 5/8"-18 x 5/16" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to the Black-Oxide finish, extending service life in demanding industrial environments.
• Exceptional thread engagement and reliability with a Class 3A thread fit, minimizing the risk of loosening under vibration.
• High-strength performance from Alloy Steel with a Rockwell C45 hardness, ensuring the set screw withstands high torque and load.
• Secure, flush installation with a headless and hex drive design, ideal for applications where a protruding head is not permissible.
• Precise fastening in fine-thread applications due to the 5/8"-18 UNF fine thread, providing a stronger hold in brittle materials.
• Easy installation and removal with a standard 5/16" hex drive, compatible with common tools for efficient maintenance.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.

Professional Applications & Engineering Value

This 5/8"-18 UNF Class 3A Black-Oxide Alloy Steel set screw is engineered to address critical challenges in precision machinery and assembly lines. Its headless design and hex drive allow for a flush fit, preventing interference in compact spaces while enabling high torque application. The fine thread spacing and Class 3A thread fit ensure minimal backlash and superior clamping force, reducing the risk of component shift in high-vibration environments like automotive transmissions or industrial robots. Made from Alloy Steel with a Rockwell C45 hardness, it resists deformation under stress, and the Black-Oxide surface treatment provides a durable barrier against rust and corrosion, making it ideal for outdoor or humid conditions. This set screw is a reliable choice for engineers seeking long-term fastening performance in applications requiring exact thread engagement and environmental compliance.

Specification Summary & Compliance

This set screw features a 5/8"-18 UNF fine thread with a Class 3A thread fit for precise tolerance, ensuring consistent performance in assembly. It adheres to standard inch measurements and is manufactured from Alloy Steel hardened to Rockwell C45. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial sectors without hazardous substances.