S-90289A550 1/4"-20 x 2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior Vibration Resistance – Serrations provide excellent locking capability to prevent loosening under dynamic loads and vibration.
• High Strength & Durability – Black-oxide alloy steel with Rockwell C45 hardness ensures long-term reliability in demanding applications.
• Precise Thread Engagement – Class 3A UNC coarse thread fit offers tighter tolerances for secure, accurate fastening.
• Easy Installation & Removal – 1/8" hex drive allows for straightforward assembly and disassembly with standard tools.
• Enhanced Grip & Alignment – Cup tip design concentrates force for better component positioning and reduced surface damage.
• Corrosion-Resistant Finish – Black-oxide coating provides added protection against rust and wear in industrial environments.
• Broad Industry Compliance – Meets ASME B18.3, RoHS 3, and REACH standards for safe, regulated use.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to solve critical challenges in machinery, automotive, and equipment assembly where vibration resistance and positional security are paramount. The combination of Class 3A UNC coarse threads and serrations ensures that components stay firmly locked, even under high-stress conditions. The cup tip minimizes surface marring while providing concentrated clamping force, making it ideal for securing collars, gears, and pulleys on shafts. With a Rockwell C45 hardness and 1/8" hex drive, it delivers both strength and ease of maintenance, reducing downtime and improving operational reliability in industrial settings.

Specification Summary & Compliance

This set screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for precision and reliability. It complies with ASME B18.3 manufacturing standards and is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations.