S-91658A159 5/16"-18 x 3/4" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 304 Stainless Steel construction for long-lasting performance in harsh industrial environments
• Enhanced holding power through ball tip design that creates permanent seating and prevents component slippage
• Optimized installation efficiency with 5/32" hex drive providing secure tool engagement and reduced cam-out risk
• Reliable thread engagement with Class 2A thread fit ensuring consistent assembly and vibration resistance
• Quick installation in coarse materials using UNC coarse threads that reduce cross-threading and enable faster assembly
• Consistent mechanical performance with Rockwell C30 hardness balancing strength and durability for repeated use
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe use in regulated industries

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw delivers exceptional engineering value for industrial applications requiring permanent component positioning. The 304 Stainless Steel construction provides excellent corrosion resistance, making it ideal for machinery exposed to moisture, chemicals, or outdoor elements. The ball tip design creates concentrated point contact that digs into shaft materials, preventing rotational movement in pulleys, gears, and collars. With coarse UNC threads and Class 2A thread fit, this fastener ensures rapid installation while maintaining precise tolerances for vibration-prone environments. The headless configuration with 5/32" hex drive allows for flush mounting in confined spaces, solving clearance issues in complex assemblies. These features combine to address critical industrial challenges including component creep, misalignment, and maintenance frequency in manufacturing equipment, automotive systems, and precision machinery.

Specification Summary & Compliance

This set screw maintains Class 2A thread fit per UNC standards, ensuring dimensional accuracy and proper clearances for industrial applications. The 5/16"-18 UNC coarse thread specification provides optimal performance in most materials, while the 3/4" length offers versatile application coverage. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and material restrictions adherence. The Rockwell C30 hardness specification ensures consistent mechanical properties throughout the fastener, supporting reliable performance in demanding industrial environments.