The Bernard 4478P O-Ring (10 Pack) is a critical consumable component designed for the maintenance and repair of Bernard MIG welding guns. These O-rings are engineered to meet the specific dimensional and material requirements of Bernard Q-Gun, S-Gun, and T-Gun series systems. The primary function of the 4478 O-ring is to establish a hermetic seal within the gas delivery system of the MIG gun, typically located at the power pin connection or within the head assembly depending on the specific model configuration. By ensuring a tight seal, these components maintain the integrity of the shielding gas envelope, which is vital for meeting welding procedure specifications (WPS).
Manufactured from high-grade elastomer materials, these O-rings offer excellent resistance to compression set, ensuring they maintain their sealing properties even after repeated thermal cycling inherent in industrial welding operations. They are also formulated to resist degradation from exposure to ozone, lubricants, and anti-spatter compounds commonly found in welding environments. The 4478 part number is a standard replacement item, and this bulk packaging of 10 units allows for efficient inventory management in high-volume fabrication shops.
Failure to replace worn O-rings can lead to significant operational issues, including the aspiration of atmospheric air into the shielding gas stream (Venturi effect) or the direct loss of expensive shielding gas. This product addresses these mechanical failures directly. The 10-pack configuration is specifically targeted at maintenance departments and tool cribs, ensuring that technicians have immediate access to replacements during scheduled preventative maintenance (PM) or emergency repairs. Installation is straightforward and requires no specialized tooling, allowing for rapid turnaround and minimal machine downtime.
Key Technical Specifications:
| Additional Information |
|---|
| Packaging Description:10 in a pack, 10 per pak |
| Item:O Ring |
| Brand:Bernard |
| Part Number:4478 |
| Material:Elastomer |
| Compatibility:Bernard MIG Guns, Q-Gun Series, S-Gun Series |
| Application:Gas Sealing, Power Pin Seal |
