Sensor Boss M12 x 1.25mm pitch

with thread down to 15mm deep

of overall depth 20mm

Sens Boss M14 x 1.5mm pitch

Overall length is 16mm

Sensor Boss M16 x 1.5mm pitch

to 22mm deep with

5.5mm through hole

Sensor Boss M18 x 1.5mm pitch

with 12mm through hole

and 3mm deep flange

Sensor Boss M12 x 1.5mm pitch

straight through full 20mm depth 

NOX Boss M22 x 1.5mm pitch thread with reduced

outer diameter to aid location before weld and lip

to prevent over insertion of sensor.

NOX Boss M20 x 1.5mm pitch thread with reduced

outer diameter to aid location before weld and lip

to prevent over insertion of sensor.

Lambda Boss M18 x 1.5mm pitch

with reduced outer diameter

to aid location before weld

Stainless Steel Angled at 45 degrees Lambda Boss with M18 thread for easier access on some exhaust systems.

Stainless Steel seal bung for Lambda Boss hole M18 threaded