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Choosing Between an O-Ring and a D-Ring Binder

Jul. 20, 2021

Choosing a three ring binder is not as straightforward as you might think. There are many options when choosing a loose-leaf binder, such as the large number of ring binders available to you.

One of these options is the ring style. Loose-leaf binders come in either round O ring or D ring forms. The D ring is able to hold more content than its counterpart, the O ring binder.

What are the differences between an O-ring binder and D-ring binder? Well, they can be boiled down to about 4 main distinctions, including shape, measuring sheet capacity, the capacity of pages and the type of mounting.

With that in mind, there are some things you should consider when choosing the best three ring binder for your needs.

3 Holes O Ring Binder Clip

3 Holes O Ring Binder Clip


The first obvious difference between the three ring binders is their shape. In fact, this is where they get their names from. o-ring binders are round binders, sometimes referred to as round ring binders. On the other hand, a D-ring binder is shaped like a "D" and is available as a slanted D-ring or straight D-ring binder. While both perform nearly the same task, D-ring binders and O-ring binders tend to have slightly different shapes, especially when filled.

Measuring Sheet capacity

This is another way to distinguish between these two types of ring binders. When you want to determine how many sheets a D-ring binder can hold, you need to measure the straight edge of the D-ring shape. When it comes to O-ring binders, you will measure the diameter of the ring, which is on the inside.

Round rings are perfect for normal capacity, partly because they don't lose their shape when the number of sheets in them is within the normal range. D-ring binders, on the other hand, will retain their shape because we use straight edges when measuring paper capacity. Therefore, a D-ring binder will be difficult to fill to capacity.

3 Holes D Ring Binder Clip

3 Holes D Ring Binder Clip

Capacity of the book pages

In addition to the size of the ring, the shape also determines the number of pages that the ring binder can hold. For example, a D-ring binder is able to hold 25% more pages than a standard round ring binder.

Most people use the normal capacity of an O-ring. If you want a binder that is suitable for holding less paper or a small number of documents, then you should consider an O-ring binder. Although they are commonly used, they have a lower paper capacity. A D-ring binder will come in handy especially when you are working on large projects that result in a lot of paperwork.


Another difference between these two types of binders is the way they are mounted. When you look at a D-ring binder, you will notice that the rings are biased towards the back cover. As a result, the pages are laid flat, which in turn makes it easier to manage it while you work. Also, this mounting reduces the pressure on the individual pages, therefore reducing the chance of pages tearing or falling out.

With the O-ring binders, the ring is usually mounted to the spine. Overfilling the O-ring binder over long periods will result in stresses in individual pages. It would thus be wise to only fill them to their recommended capacities.

All in all, both O-ring and D-ring binders have their unique uses. When it comes to which ring binder you want to choose, you will need to determine the number of pages that you are looking to accommodate over time so that you can pick a binder that will serve you for a longer period.

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