Breaking M20 bolt

[hotponyshoes]

If you know what grade the bolt is (presumably 12.9 if it's a cap head?) you could look up the shear strength and look for a gun bigger than that.
I still think it will rip up the driver but first though
Or, work out how long a bar you will need!

 

[Nimmy38]

Will a mini-ductor do it?

 

[James1979]

Are you able to say what the application is?

Can you turn a shear line on them, then wind them in? They should snap with less force.

I’m assuming you’ve got the ability to remove them first etc.

Wondered what the application is because I’m thinking that a shear force might equate to a thread stripping force??

 

[Beanwood]

Not as flash as everything else noted above, and I'm prepared to be told I'm wrong, but how about a torque multiplier?

 

[highseas]

is it just me but the thought of nay job that will involve shearing m20 just makes me feel not well thou thought of doing it by accident is bad enugh never mind on purpose..
also makitas biggest battery impact wont snap a new 8.8 i know that much

 

[Pete.]

Weld a large cold chisel to the end of a length of bar get someone to hold the bar so the chisel point is lined up then swing at it with a 14lb hammer.

 

[Other Daniel]

Would be helpful to have a bit more detail of the actual job.
Even a photo or two would help.

 

[8ob]

Would be helpful to have a bit more detail of the actual job.
Even a photo or two would help.

We got to two pages without any info

Bob

 

[Pete.]

Another option: Socket cap so get a 16mm carbide drill and drill down inside the socket. The heads will shear right off then.

 

[Barking Mat]

I think this is the man who's signed a 'non disclosure agreement'.

 

[Rrobson]

To shear that grade of fastener off your going to need at least 1500nm. If it’s a cap screw you should get it with a suitably sized 1” drive impact slug. Anything smaller you’ll probably shear the square drive. You do run the risk of rounding the hex though, although a 12.9 grade fastener will be almost as hard as the slug so you might end up damaging that instead.
My recommendation is either a long thick walled tube (scaffold not man enough) with an alien key cut short so you limit the twisting force reducing the likelihood of damaging the fastener. Otherwise it’s the same Allen key or an allen flogging spanner (or a short bit of Allen key and a flogging spanner) and smack it numerous times with a 14lb hammer.

 

[sako243]

Give it enough abuse and it might. I did two M24 nuts with mine, thought I was undoing. I wasn't...

Edit: sorry was a 24mm socket which is I think M20

 

[Arclikeharrypotter]

Give it enough abuse and it might. I did two M24 nuts with mine, thought I was undoing. I wasn't...

Edit: sorry was a 24mm socket which is I think M20

24mm socket m16 bolt. The 1/2 will break m16 8.8, but takes a little while.

 

[Kayos]

I can forward the details of the 8000nm gun?

 

[8ob]

I can forward the details of the 8000nm gun?

Is there a hugetube vid of one?

Bob

 

[Kayos]

Is there a hugetube vid of one?

Bob

Need to ask the resident expert

 

[Newlands]

What about a torque multiplier? Never used one myself, but I remember someone removing lorry wheel nuts saying you have to make sure you’re going the right way or else you’ll shear the stud off.

 

[dobbslc]

You said no heat allowed but as already mentioned above would you get away with drilling into the bolt to reduce it's effective diameter and weaken it?
Slow and steady with lube to keep it cool.

 

[addjunkie]

Daft question…have you tried the correct size aln key, with a mash hammer? Before hand if you can Id try to put a big puch and give them a good **** in the longitudinal direction.

 

[500e]

They are not shouldered bolts that have rusted in are they ?
The TQ multiplier idea
Sit down first

https://www.tester.co.uk/norbar-htx-x-handtorquer-standard-multipliers-with-awur?gclid=EAIaIQobChMInOPF6vK8-AIViO7tCh2C4QjhEAQYAiABEgKpnPD_BwE

The drill sounds the way to go you can buy a lot of drills