Not sure about the answer but maybe this helps clarify the question.
Are you asking which side, side A or side B, is attached to the lid/door? I’m don’t think I have ever paid any attention to which way I put my hinges on but I’m sure there is an industry standard. I would like to know as well. Hope someone on here has the answer.
the only way I could think of any answer for this is by researching. I perused a bunch of pictures of hinges on cabinets, boxes, etc. What I found was that more often than not, the leaf with the larger number of knuckles was attached to the carcasse or main body of the piece, while the other leaf was attached to the door, lid, etc. But sometimes it was the other way ’round.
Also, there was a remarkable lack of notation as to whether there was any real concern about which was which in any of the how-tos and tutorials I looked at.
Since Paul didn’t indicate specifically which way to put them, I suspect it really doesn’t matter that much.
Ken, this is my thought. I have always hung doors or lids putting the side of the hinge that holds the pin to the door jam or the mass of the project. I think of it as placing the hinge where it has the best foundation. That side of the hinge usually has the most rings for supporting the pin.
Ken I have fitted a lot of doors.
The solid part think your part A goes to frame and the B part goes to door. Look at butt hinge on internal door.
Always fit hinge to door first easier to move door with hinges on and place in the other leaf in frame recess