what is the purpose of colouring/painting certain bolst blue like, these are they HIGH TENSILE or is it a threadlock of some sort, all the flywheel and clutch bolts are the same too. If its a threadlock do ford sell it

 

stops the nuts coming off

 

Its thread lock. as said above


Dave

 

can u still get it......the blue coloured threadlock i mean....

 

Some of the suspension bolts are also blue, not sure if that indicates they are also high tensile or not being as even the shoulders and heads are blue

 

used to make these bolt were I worked, ford have different colours to identify different grades of bolts, so if someone uses a wrong bolt it is easily noticed, I think the blue was 12.9 grade but not 100% certain, I think it has this info in the cosworth workshop manual in the front.

 

It is defo not thread lock at all.
It is as said a COLOUR MARKER for PRODUCTION LINES, so the wrong bolts are not installed and it makes it easier to quickly find right ones(colour).
Does not indicate tensile strength other than certain strength ones are used in certain places.
tabetha

 

About the only thing i would say though, is on a Ford there are only a handful of bolts which are blue, the rest are just galvanized.

The blue ones i can think of, off the top of my head:

Front inner TCA bolts, rear gearbox mount bolts, front engine mount bolts, rear drum backplate to hub bolts, there may be a couple of others but thats about it

 

BLUE is ISO METRIC 10.9 grade
RED is ISO METRIC 12.9 GRADE
tabetha

 

Thought you ment the blue that you see on caliper bolts, you get new ones in the box when you replace brake pads.


Dave

 

Any examples of which ones are red at all for reference?