Duratec/Sigma ali radiator -- torque setting for bleed/drain screws

[John Vine]

Is there a published figure?   (For a rad like this.)

The screws are M10x1.5.

Judging by how tight I do them up normally, my empirical estimate is in the range 25-30Nm.

JV

[BigCol]

I’d assume pretty or reasonably tight but not FT… 🤔🤣

[StevehS3]

I have always tightened them by feel but I would say about 25Nm. I am always cautious.

[Dan R]

Do you put any form of washer on ? 

[John Vine]

14 hours ago, Dan R said:

Do you put any form of washer on ? 

Yes, as supplied with the rad.  Looks like a Dowty (that is, with a rubber sealing ring):

 

ETA:  Something like this. (Mine is M10, but I guess a 1/2" would fit?)

JV

 

Edited January 23 by John Vine

[John Vine]

15 hours ago, StevehS3 said:

I have always tightened them by feel but I would say about 25Nm. I am always cautious.

Thanks for that.  To gauge the possible torque, I tightened the screw in the usual way with a ring spanner (17mm), then tested the tightness with a torque wrench.  25Nm would click but 30Nm would not.

JV