S-92505A065 4-40 x 1/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for reliable, vibration-resistant fastening in demanding applications
• Enhanced corrosion resistance from the black oxide finish, extending service life in industrial environments
• High-strength durability thanks to alloy steel construction and Rockwell C45 hardness, resisting deformation under load
• Secure, slip-resistant installation with the hex drive design, allowing for high torque application without cam-out
• Precise positioning capability due to the extended tip, ensuring accurate component alignment and contact
• Broad industrial compatibility with UNC coarse threads, facilitating quick assembly and disassembly
• Regulatory peace of mind with compliance to RoHS 3 and REACH, meeting global environmental and safety standards

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered to address critical challenges in precision assembly and machinery. The black oxide alloy steel construction provides excellent resistance to rust and wear, making it ideal for automotive, aerospace, and manufacturing equipment where exposure to oils and moisture is common. The headless design and extended tip allow for flush mounting and positive locking of gears, pulleys, and collars onto shafts, preventing axial movement without protruding components. With a coarse thread and Class 3A fit, it ensures tight tolerances and reduces the risk of loosening under vibration, while the hex drive offers efficient installation in confined spaces. This set screw delivers reliable performance in high-stress applications, enhancing operational safety and reducing maintenance needs.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and interchangeability. Threads are UNC 4-40 with a Class 3A fit for precise engagement, and the extended tip features tight diameter and length tolerances (e.g., tip diameter: 0.075" with -0.005" to 0 tolerance). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming the absence of hazardous substances and supporting sustainable industrial practices.