S-90291A876 1/2"-13 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with the green nylon 6/6 plastic tip that prevents loosening under dynamic loads and protects mating surfaces from damage
• Excellent corrosion resistance provided by 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments
• High-strength, precision threads with Class 3A fit and UNC coarse thread profile for secure fastening and easy installation in high-stress applications
• Wide temperature tolerance from -50° to 250°F, allowing consistent performance in diverse operating conditions without tip degradation
• Optimized torque transmission via the 1/4" hex drive, enabling secure installation with standard tools and reducing the risk of stripping
• Enhanced durability with Rockwell B80 hardness, providing reliable mechanical strength and resistance to wear over repeated use
• Space-saving headless design for applications requiring a flush or low-profile finish without compromising on holding power

Professional Applications & Engineering Value

This 1/2"-13 UNC Class 3A hex headless set screw is engineered to solve critical challenges in industrial assembly, where vibration-induced loosening and component misalignment are common failures. The 18-8 stainless steel body offers exceptional corrosion resistance, while the green nylon 6/6 plastic tip acts as a self-locking element, maintaining clamp force in machinery, motor shafts, and precision equipment. Its coarse UNC thread ensures quick installation and high tensile strength, reducing assembly time and preventing thread galling. Ideal for OEM and MRO applications, this fastener delivers reliable performance in automotive, aerospace, and heavy machinery, where vibration resistance and long-term holding power are non-negotiable.

Specification Summary & Compliance

This set screw features a 1/2"-13 UNC coarse thread with Class 3A precision fit for tight tolerances and secure engagement. It is manufactured in compliance with ASME B18.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial supply chains.