S-91375A539 1/4"-20 x 5/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for precise, vibration-resistant fastening in demanding applications.
• Enhanced corrosion resistance from the black-oxide finish, extending service life in various industrial environments.
• High-strength durability provided by alloy steel and Rockwell C45 hardness, resisting wear and deformation under load.
• Easy installation and removal with the 1/8" hex drive, allowing for efficient assembly and maintenance with standard tools.
• Reliable grip and minimal surface damage from the cup tip design, ideal for securing components without slipping.
• Broad compatibility due to UNC coarse threading, ensuring quick engagement and robust performance in general machinery.
• Regulatory peace of mind with compliance to ASME B18.3, RoHS 3, and REACH, meeting strict quality and environmental standards.

Professional Applications & Engineering Value

This 1/4"-20 set screw is engineered to address critical challenges in industrial assembly, such as component slippage and loosening under vibration. Constructed from black-oxide alloy steel, it offers exceptional strength and corrosion resistance, making it suitable for heavy-duty machinery, automotive systems, and precision equipment. The UNC coarse thread and Class 3A thread fit ensure fast, secure fastening with high tolerance accuracy, reducing the risk of failure in dynamic environments. Its headless design and hex drive facilitate compact installations and easy access in confined spaces, while the cup tip provides a firm grip on shafts or collars without marring surfaces. Ideal for applications requiring reliable, long-term holding power, this set screw enhances operational safety and reduces maintenance needs.

Specification Summary & Compliance

This product features a 1/4"-20 thread size with UNC coarse spacing and Class 3A thread fit for high precision and strength. It complies with ASME B18.3 manufacturing specifications, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its safety and sustainability for industrial use.