S-91339A175 5/8"-18 UL 50 Sealing Nuts

Key Features & Benefits at a Glance

• Exceptional Sealing Integrity: Silicone rubber seal reliably prevents leaks in demanding applications, maintaining performance under up to 6000 psi pressure.
• Superior Corrosion Resistance: Made from 18-8 Stainless Steel, offering excellent durability in harsh or corrosive industrial environments.
• Wide Temperature Tolerance: Operates effectively across a broad range from -100° to 400° F, ensuring reliability in extreme thermal conditions.
• Precision Thread Fit: Class 2B UNF fine threads provide secure, vibration-resistant connections with minimal risk of loosening.
• Rigorous Compliance & Safety: UL 50 certified and compliant with RoHS 3 & REACH, meeting strict industry standards for safety and environmental responsibility.
• Easy Installation & Removal: Standard external hex drive allows for straightforward tightening with common tools, reducing assembly time.
• Long-Term Reliability: Combines robust stainless steel construction with a high-performance seal for extended service life in heavy-duty applications.

Professional Applications & Engineering Value

This 5/8"-18 UNF sealing nut is engineered to address critical challenges in industrial sealing, where pressure integrity and environmental resistance are paramount. The 18-8 stainless steel body provides inherent corrosion resistance, while the integrated silicone rubber seal effectively blocks fluid and gas leaks under pressures up to 6000 psi. Its fine UNF threads and Class 2B fit ensure a tight, secure connection that resists vibration loosening—common in machinery, hydraulic systems, and automotive assemblies. Ideal for applications exposed to extreme temperatures (-100° to 400° F), this nut delivers consistent performance in industrial sealing scenarios, from manufacturing equipment to fluid power systems, reducing maintenance needs and enhancing operational safety.

Specification Summary & Compliance

This sealing nut features a 5/8"-18 UNF thread with a Class 2B thread fit, ensuring precise dimensional accuracy and compatibility with standard UNF fasteners. It meets UL 50 specifications for safety and performance, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, confirming adherence to hazardous substance restrictions. The nut's design conforms to inch system measurements, with a standard hex profile for easy drive compatibility, supporting reliable use in regulated industrial applications.