S-91339A140 5/16"-18 UL 50 Sealing Nuts

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated silicone rubber seal ensures reliable leak prevention in demanding environments, maintaining integrity under fluctuating conditions.
• Exceptional Pressure Resistance: Withstands up to 6000 psi maximum pressure, ideal for high-stress industrial systems without compromising seal integrity.
• Broad Temperature Tolerance: Operates effectively from -100° to 400° F, providing consistent performance in extreme thermal cycles.
• Corrosion-Resistant Construction: Made from 18-8 stainless steel, offering excellent durability against rust and chemical exposure in harsh settings.
• Precision Thread Fit: UNC coarse threading with Class 2B fit ensures easy installation and secure, vibration-resistant fastening.
• Standard External Hex Drive: Facilitates quick and straightforward installation using common tools, reducing assembly time and labor costs.
• Comprehensive Compliance: Meets UL 50, RoHS 3, and REACH standards, ensuring safety, environmental responsibility, and regulatory acceptance.

Professional Applications & Engineering Value

This 5/16"-18 sealing nut is engineered to address critical challenges in industrial sealing applications where pressure, temperature, and environmental factors threaten system reliability. The combination of 18-8 stainless steel and a silicone rubber seal provides a robust solution for preventing fluid or gas leaks in high-pressure systems, such as hydraulic assemblies, pneumatic controls, and processing equipment. Its UNC coarse thread design and Class 2B fit enable quick, secure installations while resisting loosening under vibration—common in machinery and automotive sectors. By withstanding temperatures from -100° to 400° F and pressures up to 6000 psi, it ensures long-term performance in demanding conditions, reducing maintenance needs and downtime for industries like oil and gas, manufacturing, and aerospace.

Specification Summary & Compliance

This sealing nut features precise 5/16"-18 UNC coarse threading with Class 2B fit for consistent engagement and reliability. It adheres to UL 50 specifications for enclosure integrity and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring it is free of hazardous substances and suitable for global industrial use. Dimensions include a 1/2" width and 17/64" height, with a right-hand thread direction for standard application compatibility.