When purchasing ring clips, you will often see two easily confused dimensions:

ring spacing and eyelet spacing.

They both appear to describe “the distance between two positions,” but in fact they represent completely different dimensions.

Simply put: ring spacing determines whether the inner pages can be fitted; eyelet spacing determines whether the ring clip can be installed in the product.

If these two dimensions are not clearly distinguished, even if the purchased ring clip has the same number of rings, problems may still occur—either the inner pages will not match, or the ring clip cannot be installed.

1. What Is Eyelet Spacing on a Ring Clip?

Eyelet spacing on a ring clip refers to:

the distance between the two mounting/fixing positions on the base plate of the ring clip.

In English specification sheets, it is usually marked as:

Eyelet Spacing

A ring clip usually needs to be fixed by eyelets, rivets, or other methods to the inside of a file folder, archive box, card album, or other product.

Therefore, the base plate of the ring clip will have corresponding mounting positions.

Eyelet spacing is the distance between these fixing positions.

It mainly affects:

whether the ring clip can be correctly installed into the finished product.

2. What Is Ring Spacing on a Ring Clip?

Ring spacing refers to:

the distance between adjacent binding rings on the ring clip.

In English specification sheets, it is usually marked as:

Individual Ring Spacing

It mainly affects:

whether the metal rings on the ring clip can align with the holes in the inner pages.

For example, if the customer already has existing file inserts, card pages, or photo album inserts, the hole positions on these inner pages are usually fixed.

If the ring spacing of the ring clip does not match, even if the number of rings is the same, the inner pages may not be able to fit into the rings.

3. What Is the Biggest Difference Between Ring Spacing and Eyelet Spacing?

You can understand a ring clip as a hardware component that connects two parts.

One side connects to:

the inner pages.

The other side connects to:

the file folder, cover, or other finished-product structure.

Ring spacing is responsible for the first side.

Eyelet spacing is responsible for the second side.

A simple way to remember it is:

So although both parameters are “distances,” their purposes are completely different.

4. Why Do Both Dimensions Need to Be Confirmed When Purchasing Ring Clips?

Suppose a customer has an existing file folder and now needs to change the ring clip supplier.

The new supplier provides the same type of 2-ring clip.

If only the ring spacing is confirmed, the following situation may occur:

The inner pages can be loaded normally, but the mounting positions on the base plate of the ring clip do not match the original file folder.

The result is:

The ring clip can hold paper, but it cannot be installed onto the file folder.

The reverse is also true.

If only the eyelet spacing is confirmed, but the ring spacing is different, the following may occur:

The ring clip can be correctly fixed to the file folder, but the original inner pages cannot fit onto the rings.

Therefore, for projects that replace an existing ring clip:

both ring spacing and eyelet spacing usually need to be confirmed.

A Simple Example

Take a standard 2-ring clip as an example.

A certain ring clip may have dimensions such as:

Ring spacing: 80 mm

Eyelet spacing: 114 mm

These two figures represent completely different positions.

80 mm indicates the distance between the two binding rings.

114 mm indicates the distance between the two mounting/fixing positions on the base plate.

Therefore, 114 mm cannot be understood as the distance between the two binding rings, nor can 80 mm be treated as the mounting hole spacing.

This is also why, when reading a ring clip specification sheet, special attention should be paid to the name of each parameter column.

5. Why Can Eyelet Spacing Differ Even Among 2-Ring Clips?

Because “2-ring clip” only indicates that there are two binding rings.

It does not specify which mounting structure the base plate must use.

Different series of ring clips may have different:

• base plate lengths;

• mounting positions;

• structural designs;

• end clearances.

Therefore, even if they are all 2-ring clips, the eyelet spacing may still differ.

This is also why, in actual purchasing, you cannot simply say:

“I want a 2-ring clip.”

The manufacturer usually needs to confirm the specific dimensions further.

6. How Should Eyelet Spacing Be Measured?

If the customer already has an existing ring clip, the two fixing positions on the base plate can be measured directly.

It is recommended to measure:

the distance from the center of one mounting position to the center of the other mounting position.

This is commonly known as:

center-to-center distance.

When measuring, it is best to use millimeters as the unit.

If you are not sure whether the positions you measured are correct, you can also provide:

• a front photo of the ring clip;

• a back photo of the ring clip;

• a dimension photo with a ruler.

This makes it easier for the manufacturer to judge.

7. In Which Situations Is It Especially Necessary to Confirm Eyelet Spacing?

Particular attention is recommended in the following situations:

Changing ring clip suppliers

If the original file folder has already been mass-produced, the mounting positions are usually fixed.

At this time, it is necessary to match the original eyelet spacing as closely as possible.

Finding a replacement model for an existing ring clip

Even if the appearance looks very similar, it is still necessary to confirm whether the mounting positions are consistent.

The file folder cover has already been punched

If the cover has already undergone mounting-hole processing, the eyelet positions of the new ring clip must match the existing structure.

Existing tooling or production line

If the ring clip installation process has already been fixed, the mounting dimensions need to be confirmed even more carefully when changing specifications.

8. What If the Eyelet Spacing Is Unknown?

If the purchaser does not know this parameter, there is no need to rely only on a text description.

You can provide:

• the original ring clip sample, a photo of the base plate, or photos of the mounting positions.

If there is already an existing file folder, photos of the ring clip after installation can also be provided.

For replacement projects, a physical sample is usually more accurate than only providing a description such as “2-ring clip” or “4-ring clip.”

FAQ

1. Is eyelet spacing the same as ring spacing?

No.

Ring spacing is the distance between the binding rings, while eyelet spacing is the distance between the mounting positions on the base plate of the ring clip.

2. If the ring spacing is the same, can the ring clip be replaced directly?

Not necessarily.

If the eyelet spacing is different, the ring clip may not be able to be installed directly onto the original file folder.

3. If the eyelet spacing is the same, will it definitely work?

Not necessarily.

It is also necessary to confirm whether the ring spacing matches the inner pages.

4. Why does the manufacturer ask for both ring spacing and eyelet spacing?

Because these two dimensions relate respectively to inner-page matching and finished-product installation. They are two different structural requirements.

5. Should eyelet spacing be measured edge-to-edge or center-to-center?

It is usually recommended to measure the center-to-center distance between the two fixing positions, as this makes it easier to correspond with specification sheets.

Summary

Ring spacing and eyelet spacing are two parameters in ring clip specifications that are very easy to confuse but have completely different functions.

They can be remembered in one sentence:

Ring spacing determines whether the inner pages can be fitted; eyelet spacing determines whether the ring clip can be installed.

For a new project, these two dimensions can be matched according to the product design.

For replacing an existing ring clip, it is recommended to confirm both ring spacing and eyelet spacing at the same time, to avoid situations such as “the inner pages can be loaded but the ring clip cannot be installed,” or “the ring clip can be installed but the hole positions of the inner pages do not match.”

For ring clip purchasing, clearly distinguishing these two dimensions is the basis for accurate specification matching.