S-91855A550 3/8"-16 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Reliable coarse threading with UNC 3/8"-16 specification and Class 2B fit ensures secure, vibration-resistant fastening
• Easy installation and removal through standard external hex drive design compatible with common tools
• Complete end protection with cap nut profile that covers exposed threads for safety and aesthetics
• Environmental compliance with RoHS 3 and REACH standards meets strict industrial regulatory requirements
• Optimized dimensions (9/16" width × 5/8" height) provide balanced strength-to-size ratio for space-constrained applications
• Right-hand threading delivers consistent, predictable fastening direction for efficient assembly processes

Professional Applications & Engineering Value

This 3/8"-16 UNC cap nut delivers exceptional engineering value through its 18-8 stainless steel composition, providing superior resistance to corrosion, oxidation, and chemical exposure in demanding industrial environments. The Class 2B thread fit with coarse UNC threading ensures rapid assembly while maintaining vibration resistance, making it ideal for machinery, equipment manufacturing, and structural applications where reliability is critical. The external hex drive design allows for high-torque installation using standard tools, while the enclosed cap end prevents contamination and protects threads from damage. These features combine to solve common industrial challenges including fastener degradation, assembly inefficiency, and maintenance frequency, delivering long-term performance in automotive, construction, and marine applications.

Specification Summary & Compliance

This cap nut features precise Class 2B thread fit with UNC 3/8"-16 coarse threading and right-hand direction, manufactured to standard inch system specifications. The component maintains dimensional accuracy with 9/16" width and 5/8" height profile. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards ensures adherence to current regulatory requirements for industrial fasteners.