S-90778A538 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 for extended service life in harsh environments
• Maximum holding power achieved through Class 3A thread fit precision for secure, vibration-resistant fastening
• Enhanced grip penetration with 90° cone point design that bites deeply into mating surfaces
• High-strength performance supported by Rockwell B80 hardness rating for durable, heavy-duty applications
• Quick installation and removal with 5/32" hex drive that provides excellent torque transmission
• Reliable coarse threading using UNC standard for superior resistance to loosening under vibration
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards

Professional Applications & Engineering Value

This 316 stainless steel set screw delivers exceptional engineering value in demanding industrial environments where corrosion resistance and vibration management are critical. The UNC coarse threading combined with Class 3A thread fit creates an interference fit that prevents back-out in high-vibration machinery, while the 90° cone point concentrates force for maximum grip on shafts, collars, and pulleys. The headless design with 5/32" hex drive allows for flush mounting in space-constrained assemblies, making it ideal for precision equipment, rotating components, and permanent fastening applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards with Class 3A thread fit precision for superior dimensional accuracy. Features 5/16"-18 UNC coarse threading with right-hand direction and 0.313" thread diameter. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.