It would start stopping the door before 175 degrees. The door would stop very close to 175, then would spring back a little.
The maximum angle that the Bumperless Door Saver will allow the door to open is 180 degrees.
I used this bronze door saver on my front door that swings inward, but is an "exterior door". (I used brass ones for some interior doors.) If you can access the hinge and get the pin out, and the hinge and hinge pin have the same diameter as regular indoor hinges, then this "door saver" should work for your backdoor.
1/4" inch, quarter inch
The hinge stop is designed to work as a stop with natural motion and I dont think its strong enough to stop the forced entry of an intruder.
Depends on how loose the pin is. If it is not loose you could use it.
Yes it would fit on a main entry door. Note that the product allows for a spring like action and not a hard stop so depending on how hard the door is opened (e.g. kids) it could create problems over the long term. For the small price it is worth a try.
The height is 5/8".