O2 Sensor Weld Bung (Steel)

No exhaust build is done until the sensors have somewhere to live.

Fabrication means creating ports where none existed. The Finish Line Factory O2 Sensor Weld Bung (Steel) is steel parent stock machined into an M18x1.5 sensor bung ready for any standard O2 sensor, a must-have for new exhaust systems and fuel injection conversions. Match the steel to your parent metal and weld with confidence.

Benefits

• The port lands exactly where the design wants it, not where an adapter chain ends up
• Steel bung on steel parent metal welds like it belongs
• Sensors thread in square with clean, uncontaminated threads
• One welded bung replaces a tower of adapters at the vessel wall

Features

• Steel construction for welding to steel exhaust and chassis work
• Thread: M18x1.5, the universal O2 sensor standard
• Fits wideband and narrowband sensors
• For exhaust fabrication and EFI conversions
• Sold individually

The Details

Weld bungs live or die on material match: steel to steel, stainless to stainless, aluminum to aluminum, because dissimilar welds crack under thermal cycling. Angle O2 bungs upward of horizontal so condensation drains away from the sensor element, keep them 18 to 36 inches from the ports where practical for wideband accuracy, and run a tap through the threads after welding since weld distortion loves to pinch the last few threads. Weld in stages on thin walls, chase threads after cooling, and pressure-test before the system sees service.

Kit Includes

• 1x O2 Sensor Weld Bung (Steel) (size per your selection)

Applications

• Thread: M18x1.5
• Common uses: O2 sensor placement on headers, downpipes, and exhaust systems, EFI conversions
• Weld to steel exhaust and chassis work