S-91375A530 1 1/8"-7 x 1 1/2" 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.
• Exceptional durability provided by Rockwell C45 hardness, resisting wear and deformation under high stress.
• Corrosion-resistant black-oxide finish on alloy steel for extended service life in harsh industrial environments.
• Easy installation and removal with a 9/16" hex drive, allowing for high torque application without head interference.
• Secure positioning thanks to the cup tip design, which digs into surfaces to prevent component slippage.
• Wide compatibility with 1 1/8"-7 UNC coarse threads, ensuring easy mating with standard components.
• Regulatory peace of mind with compliance to ASME B18.3, RoHS 3, and REACH for safe, quality-assured use.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address critical challenges in industrial assembly, such as vibration loosening and component misalignment. The Class 3A thread fit and coarse UNC threads provide a tight, precise engagement that maintains clamping force under dynamic loads, making it ideal for heavy machinery, automotive systems, and permanent fixtures. The headless design with a 9/16" hex drive allows flush mounting in confined spaces, while the cup tip ensures positive contact on shafts or collars. Combined with Rockwell C45 hardness, it offers reliable performance in high-stress applications, reducing maintenance needs and downtime.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise dimensional accuracy and 1 1/8"-7 UNC coarse threads. It is manufactured from alloy steel with a black-oxide surface treatment and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and industrial reliability.