S-90291A576 5/16"-18 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Surface Protection: Green nylon 6/6 plastic tip prevents marring and damage to mating components, ideal for delicate surfaces.
• Exceptional Corrosion Resistance: Made from 18-8 stainless steel for reliable performance in harsh or humid environments.
• Superior Holding Power: Class 3A thread fit ensures tighter tolerances and a more secure, vibration-resistant fastening.
• Wide Temperature Suitability: Nylon tip maintains integrity across a broad range from -50° to 250° F.
• High Strength & Durability: Rockwell B80 hardness provides excellent mechanical strength and resistance to wear.
• Secure & Efficient Installation: 5/32" hex drive allows for high-torque application with standard tools.
• Reliable Coarse Threading: 5/16"-18 UNC coarse thread spacing enables quicker installation and better performance in softer materials.

Professional Applications & Engineering Value

This hex headless set screw is engineered to solve critical challenges in precision assembly and motion control systems. The 18-8 Stainless Steel construction offers excellent corrosion resistance, which is vital for machinery in manufacturing, marine, or food processing applications where moisture is a concern. The Class 3A thread fit and coarse UNC threading provide a superior, vibration-resistant hold, preventing loosening in high-stress environments. The integrated nylon tip is a key feature for applications requiring frequent adjustments, as it prevents galling and surface damage to shafts, pulleys, and gears, thereby extending the life of expensive components. This makes it an indispensable component for securing collars, knobs, and other parts on rotating assemblies without compromising the integrity of the mounted part.

Specification Summary & Compliance

This set screw features a 5/16"-18 UNC thread with a Class 3A fit for high precision. It is manufactured in compliance with the ASME B18.3 standard, ensuring dimensional accuracy and interchangeability. 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 industrial use.