Adjustable wrench
The hexagonal head is easy for a spanner/wrench to get a firm hold on.
Stud bolts are the ones with no head, only the bolt itself you can fast'em with vise grips or with nuts. Machine bolts are the ones that you need a wrench to fast it(you put the wrench in the head).
No, it is a wrench with a completely round head on one side.
1hz head bolt torque settings
That's correct. This particular wrench holds the nut or bolt head better than any other wrench.
The effective diameter of the bolt defines the size of the bolt head. Hence the size of the spanner or wrench that fits the bolt. There are certain exceptions but these are usually specialist applications.
A box wrench is always the most effective to loosen tight nuts.
You fit the end over the bolt head and turn . - Clockwise to tighten.
A socket wrench can drive sockets that totally encompass a nut or bolt head, thus getting a much better grip of it than a wrench.
What bolt and where is it stuck ? If it is the bolt holding the blade on, generally you hold the blade and loosen it. If this isn't possible for some reason, I would put a wrench on the head of the bolt, a 6 sided box end wrench instead of a 12 point. Hold the wrench on the head so it doesn't pop off and smack the end of the wrench down with a hammer. If you have access to one, an impact driver should do it. If it is some bolt on the saw itself, it would depend on where it was and what you can use to take it out.
Yes, the main bolt is a socket head, 8mm.
To unscrew a bolt effectively, use the correct size wrench or socket to fit the bolt head, apply steady pressure in a counter-clockwise direction, and use lubricant if the bolt is stuck. Make sure to hold the wrench securely to prevent slipping and damaging the bolt or surrounding materials.