169-730 - Replacement Shock Washer for Miller M-25 / M-40 MIG Guns (5-Pack)

Reliable Insulation and Fitment for Miller MIG Guns

The Shock Washer Miller Style (Replacement for 169730) is a critical component designed to maintain the structural integrity and performance of Miller M-25 and M-40 MIG welding guns. This component serves a dual purpose: it acts as a mechanical seat for the welding nozzle, ensuring it remains concentric with the contact tip, and it provides essential electrical insulation between the electrically live gas diffuser and the outer nozzle (if using slip-on nozzles). Manufactured to precise tolerances, this aftermarket replacement ensures that your welding gun operates within factory specifications, preventing issues such as gas turbulence, nozzle overheating, and accidental arcing.

In industrial welding environments, the shock washer is subjected to intense heat and mechanical stress during nozzle changes. Over time, the material can degrade, crack, or become brittle, leading to loose nozzles and shielding gas leaks. A compromised shock washer can disrupt the laminar flow of shielding gas, resulting in porosity in the weld bead. This replacement part is engineered from high-temperature resistant materials that withstand the thermal cycling inherent in MIG welding, providing longevity comparable to the original equipment manufacturer (OEM) part.

This pack contains five shock washers, allowing maintenance teams and fabricators to keep a ready stock of essential consumables. Regular inspection and replacement of the shock washer are recommended as part of a preventative maintenance schedule for MIG equipment. By replacing worn washers promptly, operators can avoid downtime associated with gun malfunctions and ensure consistent weld quality across various applications.

Technical Compatibility

This shock washer is specifically designed to fit the following Miller MIG gun models:

• Miller M-25: The standard gun supplied with many Millermatic 200, 210, 250, and 252 units.


• Miller M-40: A heavy-duty option often found on higher amperage industrial setups.

It installs directly over the gooseneck/diffuser assembly, requiring no modification to the gun or existing consumables.