S-91381A576 5/16"-18 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide Alloy Steel construction, extending service life in demanding industrial environments
• Precise Class 3A thread fit ensures tighter tolerances and more reliable fastening in critical applications
• Non-marring brass soft tip protects delicate surfaces from damage during clamping operations
• High-strength performance with Rockwell C28 hardness rating for dependable load-bearing capability
• Optimized hex drive design (5/32") provides secure tool engagement and reduces stripping risk
• Industry-standard UNC coarse threading (5/16"-18) enables quick installation and vibration resistance
• Headless configuration allows for flush mounting in space-constrained assemblies

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw delivers exceptional engineering value through its specialized material combination and precision manufacturing. The Black-Oxide Alloy Steel body provides enhanced durability and corrosion protection, while the integrated brass soft tip eliminates surface damage on shafts, gears, and collars—solving common marring issues in precision machinery. The Class 3A thread fit with coarse UNC threading ensures rapid installation and maintains secure positioning even under vibration, making it ideal for power transmission components, rotating assemblies, and adjustable mechanisms. The headless design with hex drive configuration offers reliable torque transmission in confined spaces where conventional fasteners cannot be used.

Specification Summary & Compliance

This precision fastener features 5/16"-18 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufacturing complies with ASME B18.3 specifications, ensuring consistent quality and performance. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) environmental standards, confirming its suitability for regulated industrial applications worldwide.