Removing a stripped(ish) hex c'sunk bolt

[CBW]

Try pouring some boiling water on it first before next attempt at removal, this may assist you.

 

[scbk]

I wouldn’t bother with any of the above methods until you’ve given it your best shot with the Allen key and it either snaps or rounds off.

^this

If you had access to a welder I would do that before drilling it out

 

[Harry Bloomfield]

If you had access to a welder I would do that before drilling it out

That has never failed for me - the welding heats the bolt up, swells it, and clears the rust. The only thing then, is how to grip it, to undo it, when it's countersunk. I would try to weld a nut onto it, through the hole in the nut.

 

[Stivino]

Just weld the Allen key in, simples.

 

[freddiemercurystwin]

Because everyone has access to a welder and knows how to use it.

 

[Bodgedbuild]

The plate that is held by the bolts, assuming it is not "keyed" by anything else, get a helper to rotate the entire plate as you try to loosen the screw. Hopefully rotating the plate and screw together will free it.....

 

[Stivino]

Because everyone has access to a welder and knows how to use it.

I take your point but, if I didn’t have access to a welder and only had a few tools, I would go with what Mottie suggested in post #5, the tried and tested centre punch and hammer method.

 

[bsr]

I would also hammer in a torx key/bit and try that. If you hammer in a torx bit then you can turn it with a 7mm spanner for extra leverage.

Option b is to drill out with a left handed drill as above.

 

[just pumps]

Only because nobody else has said it ; Could it be a left hand thread?

 

[Stivino]

Only because nobody else has said it ; Could it be a left hand thread?

Going by the image in the first post, I’d say no.

 

[just pumps]

Going by the image in the first post, I’d say no.

But that isnt the stuck screw, agree its unlikely but worth checking before heating or welding imho.

 

[Stivino]

But that isnt the stuck screw, agree its unlikely but worth checking before heating or welding imho.

I know it’s not the stuck screw, otherwise there wouldn’t be a picture of it. But there’s no reason to believe that it wouldn’t be the same.

 

[freddiemercurystwin]

But that isnt the stuck screw, agree its unlikely but worth checking before heating or welding imho.

Why would he post a pic of some other random screw rather than a pic of one of the actual screws he'd removed already?

 

[just pumps]

Why would he post a pic of some other random screw rather than a pic of one of the actual screws he'd removed already?

No reason at all.

 

[just pumps]

I know it’s not the stuck screw, otherwise there wouldn’t be a picture of it. But there’s no reason to believe that it wouldn’t be the same.

All I said was that it might be worth checking before the other suggestions as it only takes a few seconds.
I seem to remember a Flymo with the centre screw being left handed.