98W18 - ESAB 98W18 Silicone O-Ring -012 Size 70A Durometer

Precision Sealing with ESAB 98W18 Silicone O-Rings

The ESAB 98W18 O-Ring is a critical component designed for high-performance sealing in industrial and welding environments. Manufactured from premium-grade silicone, this O-ring is engineered to withstand the rigorous conditions often found in welding torches, gas regulators, and fluid containment systems. With an Inner Diameter (ID) of 0.364 inches and a cross-sectional width of 0.070 inches, it conforms to the standard AS568 -012 sizing, making it a versatile replacement part for a wide array of equipment.

Silicone is the material of choice for this application due to its exceptional thermal stability. Unlike standard nitrile or Buna-N O-rings that may degrade or harden under high heat, silicone maintains its flexibility and sealing integrity across a broad temperature range. This is particularly important in welding applications where reflected heat from the arc or conductive heat from the torch body can compromise lesser materials. The 70A Durometer hardness rating strikes the perfect balance between pliability—allowing it to conform to mating surfaces and fill microscopic imperfections—and rigidity, ensuring it resists extrusion under pressure.

Using genuine ESAB replacement parts like the 98W18 ensures that your equipment operates within its original factory specifications. A compromised O-ring can lead to shielding gas leaks, which not only wastes expensive consumables like Argon or Helium but can also introduce atmospheric contamination into the weld pool, resulting in porosity and weak welds. In liquid-cooled systems, a failed seal can lead to coolant leaks that may damage electrical components. This precision-molded silicone O-ring provides the reliability professionals need to maintain continuous, defect-free operations.

Whether you are rebuilding a vintage L-Tec torch, servicing a modern ESAB plasma cutter, or simply stocking up on essential MRO supplies, the 98W18 offers the durability and precise fitment required for critical sealing points. Its resistance to ozone and aging also means it has a long shelf life, making it an excellent candidate for your spare parts inventory.