S-90251A574 5/16"-18 x 5/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking – The permanent nylon patch thread locker prevents loosening under dynamic loads, ensuring long-term joint integrity.
• Superior corrosion resistance – Made from 18-8 Stainless Steel, this set screw withstands harsh environments, reducing maintenance and replacement costs.
• High-strength, durable construction – With a Rockwell B80 hardness, it offers excellent wear resistance and deformation prevention for repeated use.
• Reliable high-temperature performance – The thread locker remains effective from -50° to 250°F, making it suitable for varied industrial conditions.
• Precise, secure fastening – Featuring a Class 3A thread fit and UNC coarse threads, it ensures easy installation and a tight, accurate grip.
• Easy installation and removal – The 5/32" hex drive and headless design allow for efficient tool access in confined spaces.
• Enhanced gripping power – The cup point tip bites firmly into surfaces, providing superior resistance to rotational forces.

Professional Applications & Engineering Value

This 5/16"-18 UNC hex headless set screw is engineered to address critical challenges in industrial assemblies where vibration, temperature fluctuations, and corrosion are common. The 18-8 Stainless Steel material provides inherent resistance to rust and chemical exposure, ideal for machinery, automotive, and outdoor equipment. The integrated nylon patch thread locker eliminates the need for separate adhesives, simplifying inventory and reducing assembly time while maintaining a secure lock from -50° to 250°F. With its Class 3A thread fit and coarse UNC threads, it ensures quick, reliable fastening in high-stress applications, minimizing the risk of joint failure and improving overall equipment uptime.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and performance reliability. It features a Class 3A thread fit for precise tolerance, UNC coarse threads with a size of 5/16"-18, and a thread diameter of 0.313". Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards confirms its environmental safety and suitability for global industrial use.