S-94640A630 5/8"-18 Weld Nuts

Key Features & Benefits at a Glance

• Superior tube connection integrity with precise 1 3/8" tube OD compatibility and 0.095" wall thickness support, ensuring leak-proof and secure fittings in hydraulic and pneumatic systems
• Enhanced fatigue resistance from 4130 Alloy Steel construction, providing excellent strength-to-weight ratio for demanding industrial environments
• Precision thread engagement with Class 2B UNF fine threading (5/8"-18) for superior vibration resistance and reliable assembly in high-stress applications
• Optimized installation efficiency through partial threading design, allowing faster welding placement while maintaining full thread functionality
• Long-term operational reliability with right-hand thread direction ensuring compatibility with standard industrial equipment and maintenance procedures
• Regulatory compliance assurance meeting both RoHS 3 and REACH environmental standards for global manufacturing and supply chain requirements
• Reduced maintenance intervals through durable alloy steel material that withstands corrosion and mechanical stress in tube-end applications

Professional Applications & Engineering Value

This 4130 Alloy Steel tube end weld nut delivers critical performance in fluid power systems and structural tubing applications where vibration resistance and pressure integrity are paramount. The UNF fine threading (5/8"-18) with Class 2B precision fit ensures zero-backlash connections in hydraulic manifolds, pneumatic cylinders, and mechanical assemblies. Engineered specifically for 1 3/8" OD tubing with 0.095" wall thickness compatibility, it solves common installation challenges through partial threading that simplifies welding positioning while maintaining full thread engagement length. The right-hand thread direction provides industry-standard compatibility, making it ideal for maintenance and repair operations across industrial machinery, transportation equipment, and heavy-duty fabrication.

Specification Summary & Compliance

This tube end weld nut features 5/8"-18 UNF fine threading with Class 2B thread fit per UNF standards, ensuring precise dimensional accuracy and interchangeability. The 1 5/8" thread length provides sufficient engagement for high-torque applications while the 1 7/8" overall height accommodates standard installation tools. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental responsibility and global market acceptance. The nut is engineered for tubes with 1 3/8" outer diameter and 0.095" wall thickness, maintaining consistent performance across industrial fluid systems and structural frameworks.