Spark Exhaust O2 Sensor Bung M18 Titanium for Welding Universal SGATT328
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A titanium bushing with an M18 × 1.5 thread, for welding into a titanium system. Twenty-four euro, and the only correct way to put a sensor into a titanium pipe.
Key Features
- Weld-in bung for a lambda sensor, M18 × 1.5 thread.
- Titanium.
- Body Ø 25 mm, underside milled to a Ø 54 mm pipe.
- Supplied for welding to the pipe.
- Spark part number SGATT328, made in Mantova, Italy.
Titanium to Titanium
Stainless and titanium cannot be welded to one another: the joint forms brittle intermetallic phases and cracks. A titanium system needs a titanium bung, which is the whole reason this article exists alongside the cheaper steel one.
The Milled Underside
Spark machines the base of the bung to a Ø 54 mm radius, so on a 54 mm pipe it beds down along its whole rim with nothing to bridge. On a noticeably smaller or larger tube it touches at two points and rocks, and the weld then has to fill a crescent on either side — which is where porosity and cracks start. On another diameter, either dress the base back on a belt sander or accept a slower, more careful root pass.
Welding Titanium
Gas shielding on both sides of the joint and a trailing shield over the cooling bead. A small part welded into a large pipe loses heat quickly, which tempts more current; more current without adequate shielding is exactly how a titanium weld goes grey and brittle.
Position
Three tube diameters clear of a junction, in a straight section, tipped slightly upward so the sensor does not sit in condensation.
Ordering
One per sensor position. SGATT139 is the same part in stainless steel — same thread, same Ø 25 mm body — for a steel system.
| Part number | SGATT328 |
|---|---|
| Type | Lambda plug |
| Material | Titanium |
| Thread | M18 × 1.5 |
| Body diameter | 25 mm |
| Milled for pipe | Ø 54 mm |
| Fitting | Welded to the pipe |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
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// Spark Exhaust
Spark Exhaust O2 Sensor Bung M18 Titanium for Welding Universal SGATT328

Tech specs
- Part number
- SGATT328
- Type
- Lambda plug
- Material
- Titanium
- Thread
- M18 × 1.5
- Body diameter
- 25 mm
- Milled for pipe
- Ø 54 mm
- Fitting
- Welded to the pipe
- Fitment
- Universal
- Road approval
- None — track use only
- Origin
- Made in Italy
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
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