Lamy ballpoint refills can be confusing because the names look similar, but the refills are not all the same size or format. The Lamy M16, M17, M21, and M22 are all ballpoint-style refills, but they are designed for different Lamy pen families and are not automatically interchangeable.
The short version: the Lamy M16 Ballpoint Refill is the main full-size Lamy ballpoint refill, the Lamy M17 is a newer Jetstream-style option in the M16-compatible family, the Lamy M21 Ballpoint Refill is a small refill used in select multi-system and compact Lamy pens, and the Lamy M22 Ballpoint Refill is an even shorter compact refill used in pens such as the Lamy pico.
If you are not sure which refill your pen takes, start with the Pen Refill Finder or compare Lamy models on our Lamy Pens Guide.
Quick Answer: Which Lamy Ballpoint Refill Do You Need?
Most full-size Lamy ballpoint pens use the Lamy M16 or the newer Lamy M17 Jetstream-style refill, while smaller or multi-function Lamy pens may use the Lamy M21 or Lamy M22.
| Refill | Approx. Length | Common Use | Main Thing to Know |
|---|---|---|---|
| Lamy M16 | 106 mm | Many full-size Lamy ballpoint pens | Main standard Lamy ballpoint refill. |
| Lamy M17 | M16-compatible family | Newer Jetstream-style Lamy ballpoint option | Treat as an M16-family option, but confirm availability and fit before buying. |
| Lamy M21 | 67 mm | Select Lamy multi-system and compact pens | Small refill, similar in size class to D1 mini refills. |
| Lamy M22 | 60 mm | Select compact Lamy pens, including pico-style use | Short compact Lamy ballpoint refill. |
These refills are not simply different colors or tip sizes. They are different refill formats. If your pen uses an M21 or M22, you generally should not buy an M16. If your pen uses an M16, you generally should not buy an M21 or M22.
Why Lamy Ballpoint Refills Are Confusing
Lamy uses clean, simple refill names, but those names do not explain much on their own. M16, M17, M21, and M22 all sound related, but they represent different refill formats.
That creates a few common problems:
- People assume all Lamy ballpoint refills fit all Lamy ballpoint pens.
- People buy M16 refills for compact Lamy pens that need M21 or M22.
- People confuse M16 and M17 because both are associated with full-size Lamy ballpoint use.
- People assume M21 and M22 are interchangeable because both are small.
- People try to replace a Lamy ballpoint refill with a generic refill based only on length.
Lamy refill compatibility depends on the pen model, refill length, refill shape, and internal mechanism. The safest approach is to match the refill your pen was designed to use.
Lamy M16 Ballpoint Refill
The Lamy M16 Ballpoint Refill is the main Lamy ballpoint refill most people are likely to encounter. It is a proprietary Lamy refill used in many full-size Lamy ballpoint pens.
The M16 is a traditional ballpoint refill, which means it uses oil-based ballpoint ink. Ballpoint ink is thicker than gel or rollerball ink, which usually makes it practical, long-lasting, and better suited for everyday writing. The tradeoff is that some writers find traditional ballpoint ink less smooth than gel, rollerball, or hybrid ink.
The M16 is often associated with popular Lamy ballpoint models such as Safari-style, AL-star-style, studio-style, and other full-size Lamy ballpoint pens, but you should always confirm the specific refill for your pen model before buying.
- Buy Lamy M16 Ballpoint Refills: Black Fine Point, Black Medium Point, Black Broad Point, Blue Fine Point, Blue Medium Point, Blue Broad Point, Green Medium Point, Red Medium Point
- Buy Monteverde Lamy M16 compatible ballpoint refills: Black, Blue, Blue/Black, Red, Green, Turquoise, Pink, Orange, Purple, Brown
- Buy Jaymo Lamy M16 compatible ballpoint refills: Black, Blue, Red, Purple, Variety Pack
Learn more about the Lamy M16 Ballpoint Refill with our full guide to specs, compatibility, and replacement notes.
Lamy M17 Jetstream Refill
The Lamy M17 is a newer Jetstream-style Lamy ballpoint refill. It is best understood as an M16-family option rather than a replacement for M21 or M22 refills.
The M17 is interesting because it brings the smoother Jetstream-style writing experience into Lamy’s ballpoint world. Jetstream-style ink is generally known for feeling smoother and darker than many traditional ballpoint inks while still behaving more like a ballpoint than a gel pen.
That makes the M17 especially appealing for people who like Lamy ballpoint pens but want a smoother writing feel than the standard M16 provides.
The important compatibility point is this: M17 is most relevant to Lamy pens that use the M16 refill family. It should not be treated as an M21 or M22 substitute.
- Buy Lamy M17 Ballpoint Refills: Lamy M17 Refill available purchase options on JetPens.com: Black Extra Fine 0.5 mm, Black Fine 0.7 mm
LAMY M 21 Ballpoint Refill
The Lamy M21 Ballpoint Refill is a small ballpoint refill used in select Lamy multi-system and compact pens. It is much shorter than the M16, so it should not be treated as a full-size Lamy ballpoint refill.
At about 67 mm, the M21 sits in the same general length range as many D1 mini refills, but that does not mean every D1 refill is automatically a correct substitute. Small refills can be especially sensitive to tip shape, diameter, and how they sit inside the pen mechanism.
The M21 is the refill to check when you have a smaller Lamy pen or a Lamy multi-system pen that does not use the full-size M16.
- Buy Lamy M21 Ballpoint Refills: Black, Blue, Red, Green, 4-Color Set
Learn more about the Lamy M21 Ballpoint Refill with our full guide to specs, compatibility, and replacement notes. For more mini-refill context, see our D1 Mini Refill Guide.
LAMY M 22 Ballpoint Refill
The Lamy M22 Ballpoint Refill is a short compact Lamy ballpoint refill. At about 60 mm, it is shorter than both the M16 and M21.
The M22 is commonly associated with compact Lamy pens, including pico-style use. It is easy to confuse with other small refills because it is short, but the M22 is still a specific Lamy refill format. Do not assume that another short refill will work just because the length looks close.
- Buy Lamy M22 Refills: Black Fine, Blue Fine, Black Medium, Blue Medium, Black Broad, Blue Broad
Learn more about the Lamy M22 Ballpoint Refill with our full guide to specs, compatibility, and replacement notes.
Lamy M16 vs M17
The Lamy M16 and M17 are the closest pair in this article because both are associated with Lamy’s full-size ballpoint refill family.
The difference is mainly the writing experience. The M16 is the traditional Lamy ballpoint refill. The M17 is the newer Jetstream-style option for people who want a smoother, more fluid ballpoint feel.
| Feature | Lamy M16 | Lamy M17 |
|---|---|---|
| Refill family | Full-size Lamy ballpoint | M16-compatible Jetstream-style option |
| Ink feel | Traditional ballpoint | Smoother Jetstream-style ballpoint |
| Best for | Standard Lamy ballpoint replacement | Smoother Lamy ballpoint upgrade |
| Interchangeability | Main Lamy ballpoint format | Confirm fit and availability before buying |
If your pen normally takes the M16, the M17 may be worth considering as a smoother alternative. If your pen takes M21 or M22, the M17 is not the right replacement family.
Lamy M21 vs M22
The Lamy M21 and M22 are both small Lamy ballpoint refills, but they are not the same.
The M21 is about 67 mm and is used in select multi-system and compact Lamy pens. The M22 is about 60 mm and is used in more compact Lamy applications. Because these refills are small, even a few millimeters can matter.
| Feature | Lamy M21 | Lamy M22 |
|---|---|---|
| Approx. length | 67 mm | 60 mm |
| General use | Multi-system and compact Lamy pens | Compact Lamy pens |
| Same as M16? | No | No |
| Same as each other? | No | No |
If you are choosing between M21 and M22, do not guess based on size alone. Check the pen model or compare the old refill directly.
Are Lamy M16, M17, M21, and M22 Interchangeable?
No — not as a general rule.
The M16 and M17 are closely related because the M17 is best understood as an M16-compatible Jetstream-style option. But the M21 and M22 are different compact refill formats and should not be treated as substitutes for the M16 or M17.
The basic rule is:
- Use M16 if your pen calls for the standard full-size Lamy ballpoint refill.
- Consider M17 if your M16-compatible pen can use the newer Jetstream-style option.
- Use M21 if your pen specifically calls for the smaller M21 refill.
- Use M22 if your pen specifically calls for the compact M22 refill.
When in doubt, match the refill model printed on the old refill or listed for the pen.
What About Lamy M16 Alternatives?
The Lamy M16 is proprietary, so true drop-in alternatives are limited. Some writers modify Parker-style G2 refills or other refill types to work in certain Lamy pens, but those are refill hacks, not normal compatibility.
If you are interested in that route, see our Best Lamy M16 Refill Alternatives and How to Modify a Parker-Style G2 Refill article.
For most users, the safest path is still:
- Buy the correct Lamy refill.
- Choose the color and tip size you prefer.
- Consider the M17 if you want a smoother M16-family writing option.
- Use modification guides only if you understand the risk of fit issues.
Shop Lamy Ballpoint Refills
Once you know which Lamy ballpoint refill your pen uses, compare the correct refill format below.
| Refill | Best For | Buy Now |
|---|---|---|
| Lamy M16 Ballpoint Refill | Standard full-size Lamy ballpoint pens | Buy Lamy M16 Refills |
| Lamy M17 Jetstream Refill | Smoother M16-family writing option | Buy Lamy M17 Refills |
| Lamy M21 Ballpoint Refill | Select Lamy multi-system and compact pens | Buy Lamy M21 Refills |
| Lamy M22 Ballpoint Refill | Compact Lamy pens such as pico-style use | Buy Lamy M22 Refills |
How to Identify the Correct Lamy Ballpoint Refill
If you are not sure which Lamy ballpoint refill you need, start with the refill already inside the pen.
- Remove the old refill if possible.
- Look for printed markings such as M16, M17, M21, or M22.
- Measure the refill from tip to end.
- Compare the overall shape, not just the length.
- Check the pen model.
- Confirm the refill before buying.
If the refill is about 106 mm and came from a full-size Lamy ballpoint, it may be an M16 or M17-family refill. If it is about 67 mm, it may be an M21. If it is about 60 mm, it may be an M22.
You can also use the Pen Refill Finder to compare common refill lengths and shapes.
Common Lamy Ballpoint Refill Mistakes
Mistake 1: Assuming all Lamy ballpoint refills are the same
Lamy M16, M17, M21, and M22 refills are not all the same format. Match the refill to the pen.
Mistake 2: Buying M16 for a compact Lamy pen
The M16 is the main full-size Lamy ballpoint refill, but compact Lamy pens may require M21 or M22 instead.
Mistake 3: Treating M21 and M22 as interchangeable
The M21 and M22 are both small, but they are different lengths and used in different Lamy refill systems.
Mistake 4: Assuming M17 fits every Lamy ballpoint
The M17 is most relevant as a newer option in the M16-compatible family. It should not be treated as a replacement for M21 or M22.
Mistake 5: Trying a generic refill based only on length
Length matters, but so do the tip shape, shoulder, rear section, diameter, and pen mechanism.
Which Lamy Ballpoint Refill Should You Buy?
Buy the refill your pen is designed to use.
If your pen takes the standard full-size Lamy ballpoint refill, start with the Lamy M16. If you want a smoother ballpoint feel and your pen supports the M16-compatible family, consider the M17 Jetstream refill.
If your pen is a compact or multi-system Lamy pen, check whether it uses the Lamy M21 or Lamy M22 before buying.
The easiest way to avoid mistakes is to match the refill model exactly.
Related Refills
- Lamy M16 Ballpoint Refill
- Lamy M17 Jetstream Refill
- Lamy M21 Ballpoint Refill
- Lamy M22 Ballpoint Refill
- Lamy M63 Rollerball Refill
- Lamy M66 Rollerball Refill
- Lamy T10 Ink Cartridge
- Parker Quinkflow Ballpoint Refill
- Schmidt easyFLOW 9000
Related Guides
- Lamy Pens Guide
- Pen Refill Finder
- Pen Refills 101
- Pen Refill Codes Explained
- D1 Mini Refill Guide
- Parker Style G2 Refill Guide
- Best Lamy M16 Refill Alternatives and How to Modify a Parker-Style G2 Refill
- Lamy M22 Alternative: Are There Any Good Refill Options?
- Lamy M66 Refill Alternatives: Are There Any Good Options?
- Lamy M63 vs M66 Refill Guide: What’s the Difference?
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