An angle grinder or grinder is one of the most traumatic power tools. If used incorrectly, the cutting disc can jam, and even if everything works out, then after this incident it is unlikely that the fixing nut can be unscrewed using standard methods - neither the “native” key, nor the gas one, nor even a chisel with a hammer will help. So how to unscrew the nut on the grinder?
Content:

Removing the cutting disc in a non-standard way
The discs on the grinder are fixed with a nut, which is twisted in the same direction in which the spindle of the power tool rotates. And when the rotation stops abruptly, the locking nut self-tightens.
In order to unscrew it later, you need an effort that significantly exceeds that which arose with the wedge, and this is simply impossible to do with a “native” or gas key.
Gotta do it differently namely, remove the cutting disc from under the nut, and then nothing will interfere with the unscrewing of the latter.
Step #1
Pliers break the remnants of the cutting disc. Remove as much as possible.
Step #2
For the next step, you will need a metal plate with a thickness less than that of the disk. We turn on the grinder, and with this plate we grind off the remnants of the abrasive, which is located under the fixing nut. Let's not forget about safety.
Step #3
The obstruction has been removed, now you can unscrew the nut and remove what is left of the cutting disc. The nut is easily unscrewed, in most cases it can be done by hand, without the use of a tool.
Preventive measures
This method is simple and convenient, but still it is more convenient not to break anything, but simply unscrew it. In addition, there are times when the discs are simply strongly clamped. It takes a long time to break a stripping abrasive 5 mm thick, and then grind it under the nut, because there is a method that allows you to avoid the situation when the nut cannot be unscrewed with a wrench.
To do this, you only need to make a gasket from cardboard.
The tool is ready to go.
VIDEO: ★ Clamped the DISC of the GRINDER ★ UNLOCK the tightened nut EASILY
★ Clamped the DISC OF THE GRINDER ★ UNLOCK the tightened nut EASILY. Cut with a grinder, angle grinder.
How to unscrew a nut on a grinder without a key: a simple life hack