S-90291A847 2-56 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
• Exceptional vibration resistance from the green nylon 6/6 tip, preventing loosening under dynamic loads and protecting sensitive surfaces.
• High-strength performance with Rockwell B80 hardness, ensuring durability and resistance to deformation in demanding applications.
• Precise, secure fastening thanks to Class 3A thread fit and UNC coarse threads, providing excellent engagement and holding power.
• Easy installation in confined spaces with the headless hex drive design, allowing flush mounting and tool access with a .035" hex key.
• Wide temperature tolerance with nylon tip rated from -50° to 250°F, maintaining performance across diverse operating conditions.
• Regulatory compliance assurance meeting ASME B18.3 standards and RoHS 3 & REACH regulations, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 2-56 UNC set screw is engineered to address critical challenges in precision assembly and motion control systems. The 18-8 stainless steel body offers excellent corrosion resistance, reducing maintenance in humid or chemically exposed environments, while the nylon 6/6 tip provides a non-marring, vibration-dampening interface that prevents damage to shafts and components. Its headless hex drive and compact 3/16" length make it ideal for applications where space is limited, such as in electronics, machinery adjustments, and automotive assemblies. The coarse UNC threads and Class 3A fit ensure quick, reliable installation with minimal risk of cross-threading, enhancing productivity in high-volume manufacturing and repair operations.

Specification Summary & Compliance

This set screw features a 2-56 UNC thread size with Class 3A thread fit for precise tolerance, coarse thread spacing, and a right-hand thread direction. It complies with ASME B18.3 manufacturing specifications and is verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to industry standards and environmental regulations for safe use in global markets.