S-94355A718 5/16"-18 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional thread engagement and holding power due to UNC coarse thread spacing and Class 3A fit for reliable, vibration-resistant fastening
• High mechanical strength and durability provided by Rockwell B80 hardness, resisting wear and deformation under load
• Secure, flush installation with a headless design and flat tip, preventing protrusion and ensuring a clean finish
• Efficient installation and removal using the 5/32" hex drive, allowing for high torque application with standard tools
• Wide industrial compatibility with right-hand UNC threads, a common standard for machinery and equipment
• Regulatory peace of mind by meeting ASME B18.3 specifications and being RoHS 3 & REACH compliant

Professional Applications & Engineering Value

This 5/16"-18 UNC Class 3A set screw is engineered to solve critical fastening challenges in demanding applications. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for use in environments exposed to moisture, chemicals, or outdoor conditions. Its coarse UNC thread and Class 3A fit ensure rapid assembly and a secure, vibration-resistant hold, which is essential for components in machinery, motor shafts, and precision equipment where loosening could lead to failure. The headless, hex drive design with a flat tip allows for a flush mount, preventing interference with adjacent parts and enabling high clamping force in confined spaces. This combination of material properties and mechanical design delivers reliable performance in industrial set screw applications, from manufacturing jigs to automotive assemblies.

Specification Summary & Compliance

This set screw adheres to precise dimensional and performance standards, including a Thread Fit of Class 3A for superior thread engagement and a UNC thread type with a 5/16"-18 thread size. It is manufactured in compliance with the ASME B18.3 specification, ensuring consistent quality and interchangeability. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.