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September 24, 2024 - Posted by Stephanie to Guides, Refills, Pens, Beginners' Guides

The Ultimate Guide to Pen Refills

Instead of tossing your pen once the ink has run out, see if it can be filled with a pen refill! In this guide, we go over what you need to find the right refills for your pens, pen refill types, and common pen refill questions.

How to Find the Right Refill for Your Pen

Although many pens are generally the same shape and size, not all pen refills are interchangeable. Here are some ways to find a replacement refill for your pen.

1. Look Up the Pen
Many pens have their model information printed on their barrels or caps.
Many pens have their model information printed on their barrels or caps.
Many pens have their model information printed on their barrels or caps. You can use this information to search for the pen online and see if any retailers, reviewers, or the manufacturer say what refills go with it. Don’t hesitate to use the contact page of the manufacturer’s website to see if they can give you an official recommendation.
If it’s a pen we sell at JetPens, check the pen’s product page on our site and look for the “Recommended Refills/Parts” button just above the description.
If it’s a pen we sell at JetPens, check the pen’s product page on our site and look for the “Recommended Refills/Parts” button just above the description.
If it’s a pen we sell at JetPens, check the pen’s product page on our site and look for the “Recommended Refills/Parts” button just above the description. This link will take you to a list of refills that we’ve tested ourselves to confirm that they work in that pen. For example, the 0.38 mm Uni-ball Signo UM-151 Gel Pen can be refilled with Uni-ball Signo Refills of any tip size.
2. Check the Refill for Identifying Marks
Many refills will have their model numbers printed or embossed on the barrel.
Many refills will have their model numbers printed or embossed on the barrel.
If you can’t find helpful information on the pen itself, take out the refill and inspect it for identifying marks. Many refills will have their model numbers printed or embossed on the barrel. If you find a model number on your pen’s refill, try doing a web search for that model number and see what you find.

A word of caution, though: manufacturers can use similar model numbers for different refills. Just because a refill pops up when you do a web search for the model number doesn’t necessarily mean it’s the one you need. Take a close look at any pictures and specifications for the new refill and see if they match the refill you need to replace.

We also have individual product pages for the refills we carry on JetPens. Instead of a “Recommended Refills/Parts” button there is a “Compatible Products” button which shows all of the pen bodies that the refill can be used in.
We also have individual product pages for the refills we carry on JetPens. Instead of a “Recommended Refills/Parts” button there is a “Compatible Products” button which shows all of the pen bodies that the refill can be used in.
Like the pens we sell on JetPens, we also have individual product pages for the refills we carry. Instead of a “Recommended Refills/Parts” button there is a “Compatible Products” button which shows all of the pen bodies that the refill can be used in. This is helpful if you like the way a certain ink formula performs but would like to try a different pen body. For example, the 0.38 mm Uni-ball One UMR-38S Gel Pen Refill can fit in a variety of ballpoint and gel pen bodies.
3. Search for Similar-Looking Refills
If you can’t find the exact refill that your pen came with, you may be able to find a different refill of the same style that fits in your pen just as well.
If you can’t find the exact refill that your pen came with, you may be able to find a different refill of the same style that fits in your pen just as well.
For all the countless refill brands and models out there, many fall into a small number of standard styles. If you can’t find the exact refill that your pen came with, you may be able to find a different refill of the same style that fits in your pen just as well.

We should note that this is the hardest and least reliable way to find the right refill for your pen. Many refills look similar at first glance but are different in subtle ways that make them incompatible. Some refills can even be the same style but vary slightly between brands. But if the first two methods fail, this one can often save the day.

To help you find the right refill style for your pen, we go over the most common pen refills in the next section to help you identify your refill by its style.

Standard Pen Refills

These are the most commonly used refill styles that can be found in different pens by different brands. Bear in mind that some pens require spacers or adapters that help hold the refill in place inside the pen. If your pen’s original refill looks like it’s made up of more than one part, try giving them a gentle pull to see if you can separate them. If it turns out that the refill was connected to a separate adapter, make sure to keep that adapter in a safe place since you may not be able to get another.

Similarly, if your pen has a spring in the tip and that spring comes out when you remove the refill, make sure to hold onto that spring since the majority of replacement refills don’t come with replacement springs.

D1 Refill

The D1 refill is commonly used in slim multi pens and mini-size pocket pens. It's smooth and cylindrical, about 6.7 cm long and 2 mm in diameter, and almost always made entirely of metal.

D1 refills generally use ballpoint ink. There are a handful of D1 refills that use gel ink, but you may need to replace them more often because gel ink gets used up much faster than ballpoint ink. In fact, a gel ink D1 refill may run out after just a couple of pages of regular writing.

D1 refills are almost all interchangeable, but there are some exceptions. Most notably, the D1 refills made by Zebra are a fraction of a millimeter wider than those made by most other brands. This doesn’t stop Zebra D1 refills from fitting in other brands’ pens, but it often stops other brands’ D1 refills from fitting in Zebra pens. You can usually get around this problem by wrapping a small amount of tape around non-Zebra D1 refills, making them just wide enough to fit securely in Zebra pens.

To learn more about D1 refills, be sure to check out our guide.

Parker-Style Refill

The Parker-style refill is one of the most popular refill styles, combining a relatively large ink capacity with a modestly-sized form factor. This refill style is officially known as the G2 refill, but most people call it Parker-style due to its close association with Parker Ballpoint Pens and to avoid confusion with the popular Pilot G2 Refill, which is a completely different shape. It’s about 9.8 cm long and has an easily recognizable shape, with a long thin tip, a wide barrel, and a plastic end piece embedded with ratchet-like grooves. Parker-style refills are usually made of metal, but they can also be made of plastic.

Parker-style refills mostly feature ballpoint ink, but there are a handful of gel ink options, too. They’re almost always interchangeable. One issue we’ve run into on rare occasions is that some broad refills (like those greater than 1.0 mm) have large tips that aren’t able to fit through the openings of some pens.

There are tons of great Parker-style refills to choose from, but some of our favorites include the Uni SXR-600 Jetstream Ballpoint Refills and the Ohto Flash Dry Gel Pen Refill, which are smooth and fast-drying. For more ink colors, Fisher Space Pen PR Refills include an adapter that lets you use them in most pens that take Parker-style refills.

Euro-Style Refill

The Euro-style refill, also known as the Standard Rollerball, RB, and Pilot G2-style refill, is commonly used for gel and rollerball pens. It’s about 11.1 cm long and 6 mm in diameter, with a short thin tip and a long cylindrical barrel. The barrel may be made of metal, plastic, or a combination of both.

Although it looks quite different at first glance, the standard Uni Jetstream Ballpoint Refill is interchangeable with many Euro-style refills.

More so than other standard refill styles, Euro-style refills can vary in critical ways from one brand to another, which will affect interchangeability. When in doubt, refer to a pen’s recommended refills and or a refill’s compatible pens to see which combinations we’ve confirmed to work.

Some Euro-style refills have tips that stay thin all the way until it meets the barrel, while others have tips that widen as they get closer to the barrel.
Some Euro-style refills have tips that stay thin all the way until it meets the barrel, while others have tips that widen as they get closer to the barrel.
One issue that affects compatibility between brands is the shape of the tip. Some Euro-style refills have tips that stay thin all the way until it meets the barrel, while others have tips that widen as they get closer to the barrel. If a pen is designed to use one of the refills with a tip that stays thin, it might not be able to hold a refill with a tip that widens near the barrel.
Some refills, such as Pentel EnerGel and Uni-ball Signo refills, are about 1-2 mm longer than other Euro-style refills.
Some refills, such as Pentel EnerGel and Uni-ball Signo refills, are about 1-2 mm longer than other Euro-style refills.
Another factor to consider is the length of the refill. Some refills, such as Pentel EnerGel and Uni-ball Signo refills, are about 1-2 mm longer than other Euro-style refills. This may lead to these refills being too long for certain pens. If necessary, you can try cutting the extra 1-2 mm off of the end of these refills to make them fit better in pens from other brands.
A few refills—mainly some Pilot refills like the FriXion and Juice Up—have tapered ends that can affect compatibility with some pens.
A few refills—mainly some Pilot refills like the FriXion and Juice Up—have tapered ends that can affect compatibility with some pens.
Lastly, a few refills—mainly some Pilot refills like the FriXion and Juice Up—have tapered ends that can affect compatibility with some pens.
Schmidt Capless Rollerball Refill

The Schmidt Capless Rollerball refill isn’t technically a standardized style, but it’s popular enough that we wanted to include it here. It has a short, thin metal tip, and a wide, cylindrical metal barrel.

These refills are praised for their smooth, vibrant inks, but it’s important to get one that’s the right length for your pen. The key is in the model number. Both the long and short refills have a four-digit model number such as 8126, but the model numbers of the short refills start with a “P” (e.g. P8126). So if you need a 9.7 cm refill, get one with a P in the model number. At this time, we only carry the P8126 refills.

Japan Type Refill

The “Japan Type” refill is another common refill style and can be found in everything from generic promotional pens to premium customizable multi pens. Japan Type refills come in many different lengths, but they are all 3 mm in diameter and feature cylindrical barrels made of clear or white plastic.

It’s best if you can find a replacement refill that is exactly the same length as the original refill. But if you can’t find one that’s exactly the same, it’s better to get one that is a little longer and trim it down to the right length using scissors or a craft knife.

Some Japan Type refills are crimped about 2-3 cm up from the tip to create a spring stop.
Some Japan Type refills are crimped about 2-3 cm up from the tip to create a spring stop.
Some Japan Type refills are crimped about 2-3 cm up from the tip to create a spring stop. This is important for retractable pens that have springs in the tips, since the spring stop keeps the refill from just falling out through the tip of the pen.

Other pens hold the refill in place with a slot in the back of the pen that grips the end of the refill. When you insert the refill, it snaps into the slot with a reassuring little click. With this kind of pen, it doesn’t matter whether the refill has a spring stop or not.

If your pen needs a refill with a spring stop, make sure to get one that has a spring stop in the right place.
If your pen needs a refill with a spring stop, make sure to get one that has a spring stop in the right place.
If your pen needs a refill with a spring stop, make sure to get one that has a spring stop in the right place. It’s okay if the spring stop of the new refill is within 1-2 mm of the original, but any more than that could cause problems.
There are two refill lengths that are especially popular for Japan Type refills: 8.8 cm and 9.8 cm.
There are two refill lengths that are especially popular for Japan Type refills: 8.8 cm and 9.8 cm. Pictured above: Uni SXR-80 Jetstream Ballpoint Multi Pen Refill (top) and Pentel Sliccies Gel Multi Pen Refill (bottom).
There are two refill lengths that are especially popular for Japan Type refills: 8.8 cm and 9.8 cm. 8.8 cm refills are especially popular in slim pocket pens and compact multi pens, while 9.8 cm refills are commonly found in larger multi pens, including customizable multi pens like the Uni Style Fit.

Some customizable multi pens like the Pentel i+ use 9.8 cm refills with a special adapter plugged into the back. If you pull the adapter out, they can be used in other pens and multi pens that take 9.8 cm refills.

The main exception to this interchangeability is with Zebra pens. Much like their D1 refills, Zebra’s Japan Type refills are a tiny bit wider than other brands’ Japan Type refills. This doesn’t stop Zebra refills from fitting in other pens, but it does stop most other brands’ refills from fitting in Zebra pens.

Proprietary Pen Refills

We’ve covered the most common refill styles above, but a lot of brands use their own proprietary refill styles too. We list the most common proprietary refills below.

LAMY M22 Refill

The pint-sized LAMY M22 Refill can be found in the LAMY Pico. It’s about 6 cm long with a thin tip that is about one-third of its overall length.

The M22 refill comes with a gray plastic cap included. In addition to keeping the ink fresh when the refill isn’t being used, this cap can be plugged into the back of the refill, making it compatible with pens that take LAMY M16 Refills.

8.0 cm: Pilot G2 Mini Refills
Pilot G2 Mini Refill

About 3 cm shorter than a regular Pilot G2 refill, the G2 Mini refill isn’t available for sale on its own, but you can find it in G2 Mini Gel Pens. To refill this pocketable pen, you can take a regular Pilot G2 Refill and cut the end down to the right length. Before you do that, though, you’ll need to use up enough of the ink so that you aren’t cutting into the ink or the translucent gel that holds the ink in place. You’ll also need to save the plastic plug from the end of the refill and put it back into the end of the refill after you cut it. Be sure to keep the original Pilot G2 Mini refill on hand so you can measure how much of the refill you need to use and also cut off!

Pilot BRFN Refill

The Pilot BRFN Refill is essentially a shorter Parker-style refill. It’s used in a variety of Pilot pens including the S20 and Dr. Grip ballpoint pens.

BRFN refills come in two varieties: the BRFN-10, which is made of plastic, and the BRFN-30, which is made of metal. Apart from this difference in materials, though, they work the same and are completely interchangeable.

Pilot FriXion Ball Slim Refill

The Pilot FriXion Ball Slim Refill is found in a variety of FriXion “erasable” gel pens and multi pens. At first glance, it appears similar to an 8.8 cm Japan Type refill, but at about 3.6 mm in diameter, the FriXion Ball Slim refill is too wide to fit in pens that use Japan Type refills.

Fisher Space Pen PR Refill

The Fisher Space Pen PR Refill has a distinctive all-metal design. It’s very similar to the Zebra F-Refill in the next section, but the two are generally not interchangeable.

Fisher Space Pen PR refills come with a plastic adapter that you can slide to the end, making them compatible with most pens that use Parker-style refills.

Zebra F-Refill

The Zebra F-Refill has a long thin tip and a slightly thicker, relatively short barrel. It can be made of metal, plastic, or a combination of both. And unlike most refills, replacement F-Refills come with a replacement spring.

F-Refills are used in some of Zebra’s most popular pens, including their stainless steel F-301, F-402, and F-701 Ballpoint Pens. A.G. Spalding & Bros Ballpoint Pens also use this refill style.

The F-Refill looks very similar to the Fisher Space Pen PR refill, but the two are generally not interchangeable.

LAMY M16 Refill

The LAMY M16 Refill is used by the majority of LAMY Ballpoint Pens (other than the Pico, which takes the LAMY M22 Refill), and it’s easily recognizable by the distinctive black plastic collar near the base of the tip section.

The M16 can be also used in a few non-LAMY pens. Those looking for a wider range of ink colors can try Monteverde Soft Roll Ballpoint Pen Refills that feature “Soft Roll” low-viscosity ballpoint ink.

LAMY M66 Refill

The LAMY M66 Refill is used in the LAMY Swift and Tipo rollerball pens. It’s one of two LAMY rollerball refills—the other being the longer M63 Refill—so make sure to get the one that is right for your pen.

The M66 is similar to a Euro-style refill. It’s too wide to fit in non-LAMY rollerball pens, but LAMY pens that take the M66 can often take some Euro-style refills.

Uni Jetstream Standard Refill

The standard Uni Jetstream Refill may look unique, but it meets all the essential measurements of a Euro-style refill and fits in many pens that take other Euro-style refills from Uni-ball. As mentioned in the above section on Euro-style refills, however, these refills aren’t always interchangeable, so be sure to refer to our lists of recommended refills and compatible pens to see which combinations we’ve confirmed work.

Cross Ballpoint Pen Refill

The Cross Ballpoint Pen Refill is officially known as the C1 refill. As its name suggests, it's used in Cross Ballpoint Pens, with a long, thin metal barrel that has a threaded plastic knob attached to the end. This allows for twist-action extension and retraction of the refill tip.

LAMY M63 Refill

The LAMY M63 Refill is used in the LAMY 2000, Aion, AL-Star, Lx, Safari, Studio, and Vista rollerball pens. It’s one of two LAMY rollerball refills—the other being the shorter M66 refill—so make sure to get the one that is right for your pen.

The M63 is similar to a Euro-style refill but about 5 mm longer. It can’t fit in pens that take Euro-style refills, but Euro-style refills can sometimes fit in pens that take the M63 if you fill in the extra 5 mm gap behind the refill. One option is to take the spring out of an old pen and insert it behind the Euro-style refill. Another option is to create a spacer to put behind the Euro-style refill by cutting off a 5 mm long section from the back of an old refill.

Parker Rollerball Refill

The Parker Rollerball Refill has a distinctive tapering shape. It’is 11.6 cm long and just over 7 mm in diameter at its widest point. As far as we’ve found, these refills will only work in Parker Rollerball Pens, and Parker Rollerball Pens will only work with these refills.

11.6 cm: Pilot Hi-Tec-C Refills
Pilot Hi-Tec-C Refill

The standard Pilot Hi-Tec-C Refill has long been a popular choice for machined metal pens, like the CW&T Pen Type-A. Its distinctive characteristics are a long cylindrical plastic barrel and a disc-shaped collar between the barrel and the thin, needle-point tip. We should note that this refill is not available on its own, so you'll have to purchase a Pilot Hi-Tec-C Gel Pen if you need to refill your machined pen.

The Hi-Tec-C refill is similar to but generally not interchangeable with the Uni-ball Signo UMR-1 Refill.

Uni-ball Signo UMR-1 Refill

The Uni-ball Signo UMR-1 Refill is found in the JetPens fan-favorite Signo UM-151 Gel Pen (also known as the Signo DX). It looks a bit like the Pilot Hi-Tec-C refill, but instead of a disc-shaped collar and a thin needle-point tip, the UMR-1 has a cone-shaped collar that tapers down to a conical tip.

The UMR-1 is similar to other Signo UMR capped pen refills, including the UMR-5 and UMR-10 refills, but they are not fully interchangeable because the UMR-1 is about 1 cm shorter than the others. You can use a UMR-1 refill in a pen that uses any of those other UMR refills—you don’t even need a spacer to fill in the extra space behind the UMR-1—but you can’t use one of those other UMR refills in a pen that uses UMR-1 refills unless you cut off that extra 1 cm.

Uni-ball Signo UMR-5 and UMR-10 Refills

Uni-ball Signo UMR-5 and UMR-10 Refills go with many of Uni-ball’s capped gel pens, including the Signo Broad UM-153, Impact, and UM-100 pens.

They are almost identical to the UMR-1 Refill, except that their barrels are 1 cm longer. Pens that use these UMR-5 or UMR-10 refills can also use UMR-1 refills without any need for a spacer to fill in the gap behind the UMR-1. Conversely, UMR-5 and UMR-10 refills can’t fit in pens that use UMR-1 refills unless you cut off the extra 1 cm.

Common Pen Refill Questions
How to Refill Pens Video
Conclusion

Pen refills can give your favorite writing instruments new life. Do you have any refill-related questions that we didn’t answer or have a favorite tip about using pen refills? We’d love to hear about them in the comments below!



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