Flanged Boss, M18 x 1.5 thread
Type = With flange
External Dia 25.4mm (1 inch)
Flange dia 22.22mm (7/8 inch) Mounting hole dia 22.5mm Overall height 18.5mm including flange
Height after installation 10mm not including flange

Hex Sided boss, M18 x 1.5 tapped thread
Can be counter-held allowing through-hole sensor mounting eg. chimney stacks
Type = Without flange Thru hole dia 20mm
External Hex Dia 27mm AF (1 and 1/16 inch)
Overall Height 9mm

Hex Sided blanking plug, M18 x 1.5 tapped thread
Fits all standard lambda bosses with 18mm thread (and 22mm mounting hex)
External hex 25.4mm AF (1 inch)
Overall height 16.75mm (just short of 11/16 inch)
** Now includes free copper Lambda Sealing Washer **

Copper sealing washer for lambda bung listed above, or for any M18 lambda sensor
Twin pack contains two washers
Fits all standard lambdas with 18mm thread (and 22mm mounting hex)
Internal dia 18mm (23/32 inch)
Ext dia 24mm (15/16 inch)
Thickness 1.5mm (1/16 inch)
Please note one of these is included for free with each 18mm Blanking Plug purchase (above)

Flanged Boss, M12 x 1.25 tapped thread
Type = With flange
External Dia 25mm
Flange dia 18.75mm
Mounting hole dia 19mm
Overall height 8mm including flange
Height protruding after installation 5mm not including flange

Hex Sided blanking plug, M12 x 1.25 thread
Fits all standard lambda bosses with 12mm thread (and 18mm mounting hex)
External hex 16mm AF
Overall height 13.2mm
** Now includes free copper Lambda Sealing Washer **

Copper sealing washer for lambda bung listed above, or for any M12 lambda sensor
Twin pack contains two washers
Internal dia 12mm External dia 15.8mm Fits all standard lambdas with 12mm thread
Thickness 1.5mm (1/16 inch)
Please note one of these is included for free with each 12mm Blanking Plug purchase (above)