Hi @miraperry,
With lighter doors, such as hollowcore internal doors, the style, in terms of how many holes or whether they have a fixed pin or not, is not super important, as long as they are designed for use on timber doors and you use the correct number of hinges with the right screws. Two hinges are possible, but three hinges are pretty much standard with lighter doors.
If you are hanging a heavy solid core door, using three ball bearing hinges, such as these Austyle 100x75.2.5mm 304sss Heavy Duty Hinges is generally the way to go. The ball bearings allow the hinge knuckles to rotate smoothly, reducing resistance compared to standard hinges. This makes the door easier to open and close and prevents the hinge from binding under load.
If you are hanging a very heavy door, such as a fire door or reinforced door, you would use the same style of ball bearing hinges, but you would use four of them, with two at the top, one in the middle and one at the bottom. This setup helps to add support at the top of the door, at the location where the weight is pulling down on the door.
If you open the "door" section of Hume Doors & Timber Technical Information, there is a guide on recommended hinge setups which provides some good information.
If you had any questions about the function of any specific hinge, or would like me to double-check if the hinges you're looking at would work with your door, please let me know the details so I can have a look.
Jacob
