Weld-In Bungs, Nuts and Fittings

A quality weld-in bung is a smart way to add an o2 sensor, petcock drain, or plumbing fitting to automotive components like exhaust tubing, oil pans, fuel cells, or...

A quality weld-in bung is a smart way to add an o2 sensor, petcock drain, or plumbing fitting to automotive components like exhaust tubing, oil pans, fuel cells, or intake manifolds. And weld-in bungs are downright essential if you’re building a custom exhaust and need to add an oxygen sensor anywhere in the header tubes or exhaust system.

Better yet, if you’re drilling a hole in your oil pan or fuel cell to add a fitting for something like a drain, fuel line, or an external oil cooler, a weld-in bung can save a ton of time and hassle over cutting, drilling, and tapping one yourself. Weld-in bungs are also handy for folks building custom nitrous systems, where you may need to add an assortment of sensors and injectors to ensure it operates correctly.

Whether your want an aluminum bung or a steel bung, a weld-in threaded bung, or metric weld bung, Summit Racing carries plenty of weld-in options in a range of sizes and threads. From AN and metric thread to trusty NPT, you can find a weld-in bung that’s perfect for your precise need. And having a wide selection of weld-in bungs is vital, because weld-on bungs are ideal for a lot of critical applications, including oxygen sensors, along with any sort of plumbing for external fluid coolers, turbo and supercharger oiling systems, air conditioning lines, and gauges. But again, if you’re here, there’s a good chance it’s because you need a weld-in bung for an oxygen sensor. And for that, we’ve got your covered.

Even if it’s not for an o2 sensor, you can find the best weld-in bung for your needs by using Summit Racing’s handy search filters to narrow down your results. Adjust your filters by vital search parameters like the weld-in bung’s thread pitch, outside diameter, and material. There are hundreds of weld-in bung options to choose from, so there’s a very, very good chance you’ll find the right weld-in fitting or sensor bung for your ride right here at Summit Racing.

Showing In Stock Items. Show All 57 Items.

Individual Parts

Part Groups

Results 1 - 25 of 50

Innovate O2 Bung Adapters 3835

Fitting, Oxygen Sensor Adaptor, 12mm Male, 18mm Female, Stainless Steel, 45 Degree Angle, Each

Part Number: INN-38350

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Summit Racing™ Oxygen Sensor Bungs SUM-630590

Fitting, O2 Bung, Weld-In, Oxygen Sensor, 18mm x 1.5, 304 Stainless Steel, Saddle Type, Each

Part Number: SUM-630590

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Hedman Weld-In O2 Sensor Bungs 24060

Hedman Weld-In O2 Sensor Bungs 24060

Bung, Weld-In, Oxygen Sensor Bung Type, 18mm Female Threads, Steel, Each

Part Number: HED-24060

3.63 out of 5 stars ( 8 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Flowtech Weld-In O2 Sensor Bungs 10120FLT

Fitting, Bung, Weld-In, Oxygen Sensor, 18mm x 1.5, Steel, Each

Part Number: BIG-10120FLT

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Allstar Performance O2 Sensor Bungs ALL34152

Fitting, Bung, Weld-In, Oxygen Sensor, Steel, 18mm x 1.5, Angled, Each

Part Number: AAF-ALL34152

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Edelbrock QwikData 2 O2 Sensor Weld Elements 91172

Weld-on Bung, Wideband Oxygen Sensor, Steel, Universal, Each

Part Number: EDL-91172

4.83 out of 5 stars ( 6 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Daytona Twin Tec O2 Sensor Weld Nuts 115003

Bung, O2 Sensor Weld Nut, 18mm x 1.5 Female Threads, Steel, Flanged, Each

Part Number: DTT-115003

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Summit Racing™ Oxygen Sensor Bungs SUM-630591

Fitting, O2 Bung, Weld-In, Oxygen Sensor, 18mm x 1.5, 304 Stainless Steel, Each

Part Number: SUM-630591

3.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Haltech Weld Fittings HT-010701

O2 Sensor weld-on bung - 6061 Aluminum

Part Number: HTH-HT-010701

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Hedman Hedders Weld-In Bungs, Nuts and Fittings 24070

18MM STAINLESS O2 SENSOR BUNG ONLY

Part Number: HED-24070

Not Yet Reviewed

Estimated Ship Date: Mar 27, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 27, 2026 if ordered today

FuelTech Weld-In Bungs, Nuts and Fittings 5011100462

WB-O2 SENSOR WELD BUNG

Part Number: FCH-5011100462

Not Yet Reviewed

Estimated Ship Date: Jan 26, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 26, 2026 if ordered today

Summit Racing™ Oxygen Sensor Bungs SUM-G2990

Fitting, Bung, Weld-In, Oxygen Sensor, Steel, 18mm x 1.5, Each

Part Number: SUM-G2990

4.72 out of 5 stars ( 57 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Stainless Works Weld-In Oxygen Sensor Bungs O2SS

Bung, Weld-In, Oxygen Sensor Type, Stainless Steel, 18mm x 1.50 Male Threads, 1.000 in. O.D., Each

Part Number: STW-O2SS

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Vibrant Performance Standard Oxygen Sensor Fittings 19021

Oxygen Sensor Fitting, Adapter, 304 Stainless Steel, Each

Part Number: VPE-19021

5.0 out of 5 stars ( 7 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Summit Racing™ Oxygen Sensor Bungs SUM-630581

Fitting, Bung, Weld-In, Oxygen Sensor, 304 Stainless Steel, 18mm x 1.5, Each

Part Number: SUM-630581

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Summit Racing™ Oxygen Sensor Bungs SUM-G2990SS

Fitting, Bung, Weld-In, Oxygen Sensor, Female 18mm x 1.5, Stainless Steel, Each

Part Number: SUM-G2990SS

4.88 out of 5 stars ( 17 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Vibrant Performance Standard Oxygen Sensor Fittings 1194

Oxygen Sensor Bungs, Stainless Steel, 18mm x 1.5, Set of 5

Part Number: VPE-1194

5.0 out of 5 stars ( 9 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Summit Racing™ Oxygen Sensor Bungs SUM-630580

Fitting, Bung, Weld-In, Oxygen Sensor, Mild/Carbon Steel, 18mm x 1.5, Each

Part Number: SUM-630580

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Vibrant Performance Heat Sink Oxygen Sensor Weld Bungs 10419

Oxygen Sensor Bung, Heat Sink, Stainless Steel, 18mm x 1.5, Each

Part Number: VPE-10419

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Summit Racing™ Oxygen Sensor Bungs SUM-630584

Fitting, Bung, Weld-In, Oxygen Sensor, 45 Degree, 304 Stainless Steel, 18mm x 1.5, Each

Part Number: SUM-630584

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Summit Racing™ Oxygen Sensor Bungs SUM-630583

Fitting, Bung, Weld-In, Oxygen Sensor, 45 Degree, Steel, 18mm x 1.5, Each

Part Number: SUM-630583

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Vibrant Performance Standard Oxygen Sensor Fittings 1194A

Oxygen Sensor Bung, Stainless Steel, 18mm x 1.5, Each

Part Number: VPE-1194A

4.94 out of 5 stars ( 18 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Mishimoto Weld-On Bungs MMEXH-WB18-AL

Fitting, Bung, Weld-in, Oxygen Sensor, Aluminum, 18mm x 1.5, Each

Part Number: MIO-MMEXHWB18AL

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Mishimoto Weld-On Bungs MMEXH-WB18-MS

Fitting, Bung, Weld-in, Oxygen Sensor, Steel, 18mm x 1.5, Each

Part Number: MIO-MMEXHWB18MS

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 21, 2026 if ordered today

Mishimoto Weld-On Bungs MMEXH-WB18-SS

Fitting, Bung, Weld-in, Oxygen Sensor, Stainless Steel, 18mm x 1.5, Each

Part Number: MIO-MMEXHWB18SS

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 21, 2026 if ordered today

Page 1 of 2
Next