S-98057A718 5/16"-18 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life.
• Excellent holding power and minimal surface damage provided by the cup point tip, ensuring secure fastening.
• High-strength performance backed by a Rockwell B80 hardness rating for reliable, durable assemblies.
• Easy installation and adjustment with a simple slotted drive style and right-hand coarse (UNC) threads.
• Precise and consistent fit guaranteed by Class 2A thread tolerances for smooth assembly and reduced cross-threading risk.
• Space-saving headless design allows for flush mounting in applications where protrusion is not permissible.
• Guaranteed quality and safety through compliance with ASME B18.3, RoHS 3, and REACH regulations.

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw is engineered to solve critical challenges in industrial assembly and maintenance. Manufactured from 316 Stainless Steel, it offers exceptional resistance to corrosion, making it a top choice for applications in marine, chemical processing, and food-grade environments where moisture and aggressive agents are present. The headless, slotted design combined with a cup point tip provides a secure, flush fit that transmits torque effectively into the mating part, preventing loosening under vibration and ensuring long-term joint integrity. The coarse UNC thread facilitates quick installation and is less prone to clogging with debris compared to fine threads, enhancing reliability in demanding settings. This fastener delivers consistent performance, reducing downtime and maintenance costs in machinery, pulleys, gears, and other precision components.

Specification Summary & Compliance

This set screw features a 5/16"-18 UNC thread with a Class 2A fit for standard tolerance and easy assembly. It is manufactured in accordance with the ASME B18.3 standard, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for use in various industrial and international markets.