S-91375A739 1/2"-20 x 1 3/4" 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 performance due to alloy steel construction and Rockwell C45 hardness, ensuring reliable load-bearing capacity.
• Secure, flush installation with a headless design and cup tip, preventing protrusion and providing excellent grip on shafts.
• Easy installation and removal using the 1/4" hex drive, allowing for high torque application with standard tools.
• Precision fine threading (UNF 1/2"-20) for improved adjustment accuracy and stronger engagement in thin materials.
• Compliance with major standards including ASME B18.3, ensuring consistent quality and interchangeability.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address critical challenges in industrial assembly, such as component slippage and loosening under dynamic loads. The Class 3A UNF fine threads provide a tighter fit and superior resistance to vibration, making it ideal for precision machinery, automotive systems, and heavy-duty equipment where alignment and security are paramount. The headless design with a cup tip ensures a flush mount, reducing the risk of interference and damage to adjacent parts. Combined with Rockwell C45 hardness, it delivers exceptional shear strength and durability, minimizing maintenance needs and downtime in high-stress environments.

Specification Summary & Compliance

This set screw features a 1/2"-20 UNF thread with Class 3A fit for high precision and fine thread spacing. It adheres to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.