0558003926 - ESAB Nitrile O-Ring .330 ID x .050 W - 70A Hardness

Precision Sealing for Industrial Equipment

The ESAB 0558003926 O-Ring is a critical replacement component designed to restore the sealing integrity of your ESAB welding or plasma cutting equipment. Manufactured from high-grade Nitrile (Buna-N) rubber, this O-ring is engineered to withstand the rigorous demands of industrial environments. Nitrile is the industry standard for general-purpose sealing applications due to its exceptional resistance to petroleum-based oils, fuels, hydraulic fluids, and water. This ensures that the seal remains intact and effective even when exposed to common industrial lubricants and coolants.

With a hardness rating of 70 Durometer (Shore A), this O-ring provides the ideal balance between flexibility and resistance to extrusion. It is soft enough to conform to mating surfaces for a tight seal, yet hard enough to resist deformation under moderate pressure. The precise dimensions—0.330 inches Inner Diameter (ID) and 0.050 inches Cross-Section Width (W)—are manufactured to strict tolerances. Using genuine ESAB parts guarantees that the dimensions match the original equipment specifications exactly, preventing leaks that can lead to pressure loss, gas wastage, or equipment malfunction.

Proper maintenance of seals is vital for the longevity of welding and cutting systems. Worn or cracked O-rings can introduce contaminants into gas lines or allow fluids to leak, potentially damaging sensitive internal components. This replacement part is suitable for specific ESAB assemblies where a 0.330" x 0.050" seal is required. Whether used in a torch head, a gas connector, or an internal machine valve, this Nitrile O-ring delivers reliable performance and peace of mind.

Technical Specifications

• Material: Nitrile (Buna-N / NBR)
• Durometer: 70 Shore A
• Inner Diameter: 0.330 inches
• Cross Section: 0.050 inches
• Compatibility: Genuine ESAB Equipment