Stuck nut/bolt/coupling

[rigi36]

Hi all

Need to remove this old coupling in order to fit a new one.

It simply bolts through to the box section and the nuts are inside.

I cannot get either the nuts or bolts to turn and my spanner was just damaging the nut (rounding it off).

Any tips? Not sure I can get a nut splitter in far enough to reach the nuts.

Thanks.

[paddlers]

Angle grinder !!

[rigi36]

Where would you cut?

I did think of cutting under the bolt heads with a hacksaw - would this be a bad idea?

[Rogue Wave]

CUT THE BOLT HEADS OFF?

Bosch Cutting Disc 115 x 22.2 x 1mm | Cutting Discs | Screwfix.com

THIS IS A VERY THIN DISK SO YOU CAN GET IT FAIRLY FLUSH TO THE UNDERSIDE OF THE BOLT. BE CAREFUL THAT YOU DONT PUT ANY TWIST IN THE DISC AS YOU ARE CUTTING KEEP IT LEVEL.

OR YES YOU COULD DO IT WITH A HACKAW PROBABLY SAFER IF YOUR NOT HAPPY WITH AN ANGLE GRINDER

[matt h]

Blimey. Just cut the heads of with a 4.5 inch grinder!!

[A1an]

Aye, off with their heads.

[jyasaki]

Originally Posted by paddlers

Angle grinder !!

Grind or cut the heads off.

If you don't have an angle grinder, center punch the middle of the head, and drill down to the level of the drawbar (or just beyond) until you get to the diameter of the threaded part of the bolt. The heads will fall off.

jky

[spartacus]

Originally Posted by paddlers

Angle grinder !!

Classic. Never mind this subtle touchy feely approach with penetrating release oil or whack an imperial socket on the head.

[Wozizname]

Don't use a spanner, use a 6 sided hex socket to prevent the rounding off.
If that doesn't shift them and rounded off THEN the above grinder method and drilling/re tapping the threads.

[camelgas]

OP : where are you ? , as if you do not have a grinder, there may be someone here nearby that has !.

[paddlers]

Grind the heads off ( or cut if you have a cutting disc) as you're replacing the unit anyway. This will leave the stub exposed to soak with wd40 then either get to work with vice grips and heat or cut them flush & drill out if the nut's welded in. Reassemble using copperease or similar