S-90291A860 1/4"-28 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Secure, non-marring fastening with a durable nylon 6/6 tip that protects sensitive surfaces from damage and prevents loosening under vibration.
• Superior corrosion resistance provided by 18-8 Stainless Steel construction, ensuring long-term reliability in harsh or humid environments.
• Precise, high-strength threading with a Class 3A UNF fine thread fit for superior clamping force and vibration resistance in critical assemblies.
• Wide operational temperature range from -50° to 250° F, thanks to the high-performance nylon tip material.
• Easy and secure installation with a hex drive style that allows for high torque application and a headless design for a flush, space-saving fit.
• Consistent quality and reliability backed by compliance with the ASME B18.3 standard for dimensional accuracy and performance.
• Environmentally responsible manufacturing confirmed by RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

This nylon tip set screw is engineered to solve common industrial challenges such as component slippage and surface damage. The 18-8 Stainless Steel body provides excellent corrosion resistance, essential for machinery in demanding environments, while the Class 3A UNF fine thread ensures a tight, secure fit that resists loosening from vibration. The green nylon 6/6 plastic tip offers a non-marring, high-friction contact point, making it ideal for securing adjustable components on shafts, gears, and pulleys without damaging the mating surface. Its headless design and hex drive facilitate installation in confined spaces, providing reliable performance in precision assemblies across automotive, aerospace, and manufacturing sectors.

Specification Summary & Compliance

This set screw features a 1/4"-28 UNF thread with a Class 3A fit for high precision and strength. It is manufactured in compliance with the ASME B18.3 standard, ensuring dimensional accuracy and reliability. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to strict environmental and safety regulations for hazardous substances.