S-91658A163 5/16"-18 x 1" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 304 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Enhanced gripping power and reduced surface damage thanks to the precision ball tip design, ensuring secure component positioning.
• Reliable, vibration-resistant fastening provided by the coarse UNC thread and Class 2A fit, preventing loosening under dynamic loads.
• High-strength performance with a uniform Rockwell C30 hardness for both the screw body and tip, offering excellent wear resistance.
• Easy installation and removal using a standard 5/32" hex key, facilitated by the headless design for applications with space constraints.
• Compliance with stringent environmental regulations, being RoHS 3 and REACH compliant for use in regulated markets and applications.
• Versatile right-hand thread application suitable for a wide range of standard machinery and equipment assembly needs.

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw is engineered to address common challenges in power transmission and precision assembly. The 304 Stainless Steel material provides excellent resistance to oxidation and many chemicals, making it a reliable choice for industrial applications exposed to moisture or corrosive agents. The ball tip design minimizes stress concentration on the shaft or component being secured, reducing the risk of galling and allowing for repeated adjustments without compromising the seated surface. Combined with the coarse thread and Class 2A thread fit, this fastener ensures a tight, secure hold that resists back-out from vibrations, which is critical in motors, pulleys, and gear assemblies. Its headless and hex drive configuration allows for flush mounting in tight spaces, providing a clean, unobtrusive fastening solution that maintains alignment and safety in dynamic systems.

Specification Summary & Compliance

This set screw adheres to UNC (Unified Coarse) thread standards with a Class 2A thread fit for consistent, reliable engagement and dimensional accuracy. It is manufactured to meet industry specifications for a 1" length, 5/16"-18 thread size, and 5/32" hex drive. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted hazardous substances and suitable for global industrial and commercial use.