Interior Door Hinge Types: How to Choose the Right One

Hinges look like a solved problem until the door you ordered arrives and the hinge box holds a type that will not work on it. Most interior hinge confusion comes down to three questions: which bearing is inside, what the hinge is sized to fit, and how many of them the door needs. Answer those before you spend anything.

Answer those before you spend anything, and the rest of the job is mechanical.

The good news is that the hardware shelf in a home centre carries only a handful of options that matter for interior work. Everything else on that peg wall is for cabinets, gates, or exterior doors that see weather.

This guide covers the hinges that matter for a door slab going into an interior frame, and it lines up with the sizing work in how to measure an interior door. If you are still working out what kind of door you have, read prehung versus slab door first, because that choice changes what hardware you need.

Three hinge bearings, and the one your door actually needs

A stack of <strong>interior door hinges</strong> in plain bearing, ball bearing, and spring styles arranged on a workbench beside a <strong>door slab</strong> edge” width=”1280″ height=”720″ /><figcaption>Three bearing styles cover almost every interior door. The radius of the knuckle has to match the recess cut in the door edge.</figcaption></figure> <p>Inside the knuckle of every hinge there is a bearing, and the bearing is what decides how long the hinge lasts and how it sounds when it moves.</p> <p>A <strong>plain bearing hinge</strong> has a plain pin with no bearing material between the knuckles. It is the cheapest option and the one you will find in the greatest number of homes.</p> <p>It works, but the knuckles wear against each other directly. That wear is where the squeak comes from once the finish dries out and the door is moved more often than it was when it was installed.</p> <p>A <strong>ball bearing hinge</strong> puts a bearing between the knuckles, so the moving surfaces roll rather than scrape. Hardware suppliers consistently recommend them for high-traffic doors and for <strong>solid core door</strong> leaves, which are heavier than the hollow ones and put more load on the pin.</p> <p>A <strong>spring hinge</strong> returns the door to the closed position on its own once you let go of the knob. These are standard on exterior side doors and garage doors. They are sold for interior use too, and they earn their place in a laundry room, an office, or any room where you would rather the door stayed shut than swung wide and stayed.</p> <p>Here is the practical part. For a bedroom or bathroom door in a house that gets normal use, plain bearing is adequate.</p> <p>For a <strong>solid core slab</strong>, a door that gets pushed hard, or a house with children who treat doors as hockey pucks, ball bearing is the cheap insurance.</p> <p>For a room you want to stay closed, a spring hinge solves a problem no other part of the door can.</p> <h2>Match the hinge to the door thickness and the frame</h2> <p>Hinges are sized by the thickness of the door leaf, and a hinge that is close enough to fit is not close enough to work. The hinge leaf has to sit flat against the door edge and flat against the frame, with no gap and no forcing.</p> <p>The standard interior <strong>door thickness</strong> is 1-3/8 inch. A hollow core interior slab runs 1-3/8 inch, and a solid core slab usually runs 1-3/4 inch.</p> <p>Hinges are commonly sold in these two sizes. A 1-3/4 inch hinge will not sit flat on a 1-3/8 inch door without a spacer or a swaged hinge machined to fit.</p> <p>That leads to the second distinction, and it is the one that catches people. A <strong>mortise hinge</strong> is cut into a recess in the door edge and the frame, which is why the door sits flush in the opening.</p> <p>A <strong>nonmortise hinge</strong> is a <strong>surface mounted</strong> hinge, with the leaves screwed flat onto the face of the door edge and the jamb.</p> <p>Surface mounted hinges are thicker, so the door projects further out of the frame.</p> <p>They are the standard for surface applied doors, where cutting a recess would be more work than the door deserves.</p> <p>Most residential work you will meet uses the recessed kind, and you do not get to choose.</p> <p>The <strong>hinge gauge</strong> you use to check the recess depth tells you what size hinge belongs. If the door you are working on was hung with the leaf let into the edge, that is what you replace it with.</p> <p>One more sizing point worth knowing. The <strong>hinge width</strong> is not the door thickness. It is the length of the leaf along the door edge.</p> <p>It decides how far the hinge swings and how much of the edge the hinge covers. Hinges are usually sold as 4 inch, and for a standard interior door that is the right length.</p> <h2>How many hinges, and why the count follows the height</h2> <p>The number of hinges is not a matter of taste. It follows the door height, because the weight of the door acts as leverage on the hinge pins.</p> <p>The rule that comes out of the major hardware buying guides is simple. One <strong>one hinge per 30 inches</strong> of door height is the baseline, and the rest of the guidance is about the exceptions.</p> <p>An 80 inch door is the standard interior height in North America, which puts it in the range where <strong>two hinges</strong> are acceptable and <strong>three hinges</strong> is the better answer. A taller door, and a solid core leaf in particular, wants three.</p> <p>Any door over 80 inches tall wants <strong>four hinges</strong>. So does a door that is heavier than the standard hollow core slab, because the extra weight is what causes the top of a door to sag away from the stop over time.</p> <p>There is one situation where you add a hinge even though the count works out. A door that is heavy, or one that gets slammed, benefits from a third hinge in the middle.</p> <p>The <a href=prehung installation guide covers where the hinge positions land on the frame, and the spacing between them matters as much as the total.

Adding hinges is not a substitute for a fix. If a door sags because the hinges are too few or too light, a stronger hinge at the same position helps only a little.

The sag has to be corrected at the top hinge first, and that is a separate job.

Radius, finish, and the details that get ordered wrong

The corner radius of a hinge is the shape of the knuckle end. Three are common: square corner, quarter inch radius, and five eighths inch radius.

The radius has to match the frame you already have, because it is cut into the hinge recess. A mismatch shows as a visible gap at the corner of the door edge.

There is a test for this that does not require a catalogue. Take a coin and press it into the corner of the old hinge.

A quarter inch radius matches a dime. A five eighths radius matches a quarter. If the coin sits in the corner with the curve matching the metal exactly, you have found the right one.

Next is whether the hinge can be removed without damaging the door. A remove the pin hinge has a pin that lifts straight out, so the door comes off without pulling the hinge leaves out of the recess.

A nonremovable pin is riveted or bonded in place, and those hinges are meant to stay. Replacing one means damaging the door edge to get at it.

Third, the finish. Hinges are sold in the same finishes as the hardware on the door, and mismatched hinges are the most visible mistake on a new installation.

The door is only open half the time, and the hinge is what you see when it is. Brushed nickel, aged bronze, polished brass, and black are the finishes most doors in North American homes actually use.

Fourth, and least obvious, the screw holes. The holes on the door edge have to line up with the ones on the hinge, or the hinge sits proud and the door will not close.

This is why you should not order hinges by appearance alone. A photo of the old hinge, taken square to the leaf with a coin for scale, settles it in a second.

What to check before you buy, in one pass

Run through this list before you order, and it takes about two minutes.

  1. The leaf length, which for a standard interior door is 4 inch.
  2. The leaf thickness that matches your door, 1-3/8 inch or 1-3/4 inch.
  3. The bearing type, which is where most people should spend an extra few dollars and move up to ball bearing.
  4. The finish, matched to the knob and the other hardware on the door.
  5. The closing speed if you want a self-closing spring hinge, and the swing of it, because a spring hinge set too fast is worse than none at all.
  6. The screw hole pattern. Hold the new hinge against the old one before you pay for it.

Two of those six items decide whether the hinge will physically fit. The other four decide whether the door works properly for the next fifteen years.

Getting the bearing and the thickness right matters more than the finish, and the fit matters more than both.

Once the hinges are right, the rest is a straightforward sequence: mortise the recesses, hang the leaf, and set the pin. The handle and latch guide covers the other half of the hardware on the same door, and it is worth reading in the same sitting so the two jobs do not fight each other over the same 2 inches of door edge.

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