S-90291A077 2-56 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with a durable nylon 6/6 tip that maintains grip under dynamic loads and prevents loosening
• Excellent corrosion resistance provided by 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
• Precise thread engagement with Class 3A thread fit for secure fastening and reduced risk of cross-threading in assembly
• Wide temperature tolerance with nylon tip operating from -50° to 250°F, suitable for diverse industrial applications
• Easy installation and removal thanks to the hex drive design, allowing for efficient maintenance with standard tools
• Enhanced material durability with Rockwell B80 hardness, offering good strength and wear resistance for repeated use
• Reliable regulatory compliance meeting ASME B18.3 standards and environmental regulations like RoHS 3 and REACH for safe, global use

Professional Applications & Engineering Value

This 2-56 UNC set screw is engineered to address common industrial challenges such as component slippage and vibration-induced failures. Crafted from 18-8 stainless steel, it delivers robust corrosion resistance, making it ideal for machinery exposed to moisture or chemicals. The green nylon 6/6 plastic tip provides a soft, non-marring contact surface that absorbs shocks and maintains clamping force, preventing damage to sensitive parts. Its coarse thread spacing and right-hand thread direction ensure quick, secure fastening in precision assemblies like electronic enclosures, automotive systems, and mechanical linkages. By combining a hex headless design with a Class 3A thread fit, this screw offers reliable performance in applications demanding high torque and minimal backlash, reducing maintenance downtime and enhancing operational safety.

Specification Summary & Compliance

This set screw features precise UNC thread specifications with a Class 3A thread fit for tight tolerances and consistent performance. It adheres to ASME B18.3 manufacturing standards, ensuring dimensional accuracy and reliability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for hazardous substance control. The screw's inch-based measurements, including a 1/4" length and 0.086" thread diameter, support seamless integration in standardized industrial systems.