AJ6 Cylinder Head Bolt Thread Size

The head is 17mm. The thread diam. is 11mm(7/16"?). The thread is course. A 7/16-14 seems to fit nicely. I don’t believe there is an M11-1.75 size, or am I wrong? This is a brand new bolt from Jaguar.

Can anyone shed light on this? Is it possible the head is metric and the thread is SAE?
75mm
-14SAE




Can’t speak to the Jag, but old Volvos were that way.

A quick internet search brings up this;


Do you know the original bolts for the AJ6 can be reused twice?
You need to centre pop the bolt head once to indicate the first re-use and a second one when/if the bolt is re-used again.

Yes I do. My question is unrelated. I suspect Jaguar has made a non standard bolt/thread combination. M11 x 1.75 would generally be considered non standard I believe. At least good luck finding bolts or nuts or even finding them referenced on engineering thread charts.

They are in fact M11 x 1.75.