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Weld-In Bungs, Nuts and Fittings

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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...

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.

Individual Parts

Results 1 - 25 of 118

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 )

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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 )

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

Part Number: NGK-91301

4.36 out of 5 stars ( 22 )

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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 )

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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 )

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

Part Number: EAR-OXY018ERL

4.91 out of 5 stars ( 11 )

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

Part Number: HED-24060

3.63 out of 5 stars ( 8 )

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

Part Number: SUM-630580

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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 )

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

Part Number: BIG-10120FLT

5.0 out of 5 stars ( 6 )

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

Part Number: EAR-SSOXY018ERL

5.0 out of 5 stars ( 2 )

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

Part Number: AAF-ALL34152

5.0 out of 5 stars ( 2 )

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Weld-In Bung and Fitting, J-Style Oxygen Sensor Fitting, Stainless Steel, M18 x 1.5 Female Threads, Each

Part Number: VPE-19019

3.93 out of 5 stars ( 15 )

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

Part Number: SUM-630583

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

Part Number: SUM-630584

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Bungs, Nuts, and Fittings, Weld-In, Oxygen Sensor Bung, Steel, 18mm x 1.5, Female Thread, Each

Part Number: HLY-534-49

4.88 out of 5 stars ( 8 )

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

Part Number: RNB-917-113

5.0 out of 5 stars ( 1 )

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Oxygen Sensor Fitting, Adapter, 304 Stainless Steel, Each

Part Number: VPE-19021

5.0 out of 5 stars ( 7 )

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Bung, Oxygen Sensor, Weld-In, Steel, Female Threads, 18mm x 1.50, FAST, Each

Part Number: FST-30168

5.0 out of 5 stars ( 3 )

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

Part Number: VPE-1194A

4.94 out of 5 stars ( 18 )

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Stack Oxygen Sensor Bungs ST269553

Mail - In Rebate

Rebate amount based on part(s) total.

Rebate Expires: 4/30/2026

Get up to $150 back after rebate when you buy products from AutoMeter Brands! Go to: http://summitracing.com/go/atm

Get up to $150 back after rebate when you buy AutoMeter Products! Also includes Auto Gage, Dedenbear, Marine, Spek-Pro and Stack Brands. Spend $100-$199 and get $10 back. Spend $200-$449 and get $25 back. Spend $450-$699 and get $50 back. Spend $700-$999 and get $75 back. Spend $1,000-$1,499 and get $100 back. Spend $1,500 or more and get $150 back. Go to http://summitracing.com/go/atm for complete offer information. Valid on purchases made between 3/15/26 and 4/30/26. Rebate submission must be postmarked by 5/31/26. Limit one rebate per household. Allow up to 12 weeks for processing. Purchase amount is the subtotal before taxes and shipping.

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

Part Number: SGG-ST269553

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

  • Mail - In Rebate

    Rebate amount based on part(s) total.

    Rebate Expires: 4/30/2026

    Get up to $150 back after rebate when you buy products from AutoMeter Brands! Go to: http://summitracing.com/go/atm

    Get up to $150 back after rebate when you buy AutoMeter Products! Also includes Auto Gage, Dedenbear, Marine, Spek-Pro and Stack Brands. Spend $100-$199 and get $10 back. Spend $200-$449 and get $25 back. Spend $450-$699 and get $50 back. Spend $700-$999 and get $75 back. Spend $1,000-$1,499 and get $100 back. Spend $1,500 or more and get $150 back. Go to http://summitracing.com/go/atm for complete offer information. Valid on purchases made between 3/15/26 and 4/30/26. Rebate submission must be postmarked by 5/31/26. Limit one rebate per household. Allow up to 12 weeks for processing. Purchase amount is the subtotal before taxes and shipping.

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

Part Number: VPE-1194

5.0 out of 5 stars ( 9 )

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

Part Number: RNB-917-111

Not Yet Reviewed

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

Part Number: XFO-BNG-01

Not Yet Reviewed

Estimated Ship Date: May 11, 2026 if ordered today

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Estimated Ship Date: May 11, 2026 if ordered today