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🖋️ The pen that outperforms your hustle—anywhere, anytime, no excuses.
The Fisher Space Pen Military Cap-O-Matic is a pressurized ballpoint pen engineered to write smoothly in zero gravity, underwater, upside down, and extreme temperatures from -30°F to 250°F. Featuring a durable matte black alloy steel and brass body with a single-hand snap activation, it’s designed for professionals who demand reliability in any environment. Backed by a lifetime warranty and trusted by astronauts, military personnel, and adventurers, this pen combines rugged durability with sleek, tactical style—making it the ultimate everyday carry for the modern professional.









| ASIN | B001E103CY |
| Additional Features | Waterproof |
| Age Range (Description) | Adult |
| Age Range Description | Adult |
| Best Sellers Rank | #6,580 in Office Products ( See Top 100 in Office Products ) #167 in Ballpoint Pens |
| Body Shape | Round |
| Brand | Fisher |
| Brand Name | Fisher |
| Closure Type | Snap |
| Color | Miliary Matte Black |
| Customer Reviews | 4.6 out of 5 stars 7,714 Reviews |
| Drill Point | Medium |
| Global Trade Identification Number | 00747609542448 |
| Grip Type | Contoured |
| Hand Orientation | Ambidextrous |
| Hardness | B |
| Included Components | 9004518 |
| Ink Color | Black |
| Item Diameter | 0.38 Inches |
| Item Dimensions | 5.2 x 0.5 x 0.5 inches |
| Item Weight | 0.02 Pounds |
| Line Size | 1.1 Millimeters |
| Manufacturer | Fisher Space Pen |
| Material | Alloy Steel , Brass, Tungsten Carbide |
| Material Type | Alloy Steel, Brass, Tungsten Carbide |
| Model Name | 9004518 |
| Model Number | M4B |
| Recommended Uses For Product | Writing |
| Style | Gift Box |
| Unit Count | 1 Count |
| Warranty Description | Lifetime |
| Water Resistance Level | Waterproof |
| Writing Instrument Form | Ballpoint Pen |
R**P
High quality low cost makes this pen a WIN!
I have been using these pens for over 20+ years now. I have constantly and consistently relied upon these pens, and they have not failed me yet. I highly recommend these pens and here is why: Short Review: High quality, low cost makes these pens: worthy! I have brought these pens along with me through battlefield conditions. Rain, sleet, snow, mud... (These pens were designed for the rigours of space - so they scoff at Earth conditions). I have been able to write with them throughout my service and after. They are reliable pens. I buy these pens without hesitation when prices drop below $10 bucks (you should too). They pretty much keep forever, and are awesome gifts. They are brass metal underneath with a thick paint coat over it. The most I've had to do (and I don't abuse my things on purpose) is touch up the tip where the pen comes out. I've dropped it, stepped on it, left if lying around in harsh weather, boxed it up for years and forgotten about it, bought more of these exact same pens, lost them, found them... You name it. Each time, these pens have come out WRITING. They are so reliable, that I would actually be SURPRISED if they did not work due to anything OTHER than running out of ink. I wanted a pen without a detachable cap (just seemed like another thing to lose), and this model fits the bill perfectly. So, if you want a good reliable pen that won't break the bank or your heart if you ever were to lose it, get this one. Long Review: The first time I ever actively handled these pens was during basic training for the military. I knew of them before that. Just never felt that I needed anything more than a .10 cent Bic or Papermate pen, and I bought those in boxfuls. At the time, I did not have time to worry about "quality" or "consistency" - they had a lot of print on their packaging saying how they were "space pens," "high quality." All that jazz. The only thing that mattered was whether or not it would work in the field. Internet was not readily available to share information or do research (yeah, I'm old). During those days, people just had to trust what was written on the packaging 99% of the time and if it didn't work... too bad, so sad. You just avoid that brand in the future while telling all your buddies to avoid it too. Sure, it lent to having something to talk about with your friends during down time, but there were many lost pennies, and inefficient purchasing habits too. So, for anyone who was in the military (and I'm not sure if they changed these rules or not) we were not allowed to have the average Bic pens because they had these white plastic pen tubes at the time (Papermate pens were blue - also a no-no). Almost all items going into the field could not be reflective or shiny, and certainly not rainbow colored. There were certain exceptions (no idea why I was allowed to carry these) and they were: the Leatherman multitool (Tim Leatherman had just released his original tool without the locking blades, and it was still shiny stainless steel - nothing was tactically painted or blacked out), and the bright red swiss army knives (there were not many color variations in the swiss army knife scales back then either). I only know because I brought both into the field - go figure. Its the military. What can I say? Anyway, to be certain that your other items met field-worthiness, their colors had to be muffled. We had a couple of soldiers just wrap a piece of "100 mph" field tape around a bic. For some reason, I didn't - though I'm kind of glad today that I didn't. Countless soldiers have lost their gear crawling around in the field - especially pens and whatnot... So... of course, I bought this pen in black. It was like a $5 dollar pen back then (expensive by those standards) and I didn't want to lose it. Whenever the pen got scuffed up to the brass, we had to get a black sharpie marker and just "paint" over it again. Miraculously, this pen never got lost and stayed with me (through basic training and everything!). I still have it to this day - and it continues to write flawlessly. Strangely, I have never changed out its original ink fill. I credit that to not writing exclusively with this pen, but still... after 20+ years... it still writes! I discovered a couple of things because of this. This ink... it doesn't dry up like other "normal" inks. It just keeps on lasting. I have found new boxes of Bic pens with less time in the stockrooms which no longer wrote ("guaranteed to write every time!" - nope.). Those pitiful dried up husks of former greatness... money in the garbage. That meaningless scribble printed on their boxes... It would cost you more money to get them to execute on their guarantees and warranties than to just buy another box. I've had pens from China that dry up in less time and even fade after they touch paper for a year. Not this ink. I've only had ONE other brand of pen that still wrote after 15+ years of being forgotten somewhere in a bag and that pen cost around $250! But that pen cannot write underwater, upside down... etc. etc. etc. This pen is a beast. It still functions. It writes in water, upside down and in a huge range of temperatures. For the adventurers out there (jumping out of airplanes every moment you get, or climbing mountains all the time... you know who you are), you don't have to worry about it popping under different air pressures or temperatures. You don't have to worry about landing in a pond or a lake. Go ahead and place your notepad on the wall to write if no tables are nearby. This pen will function. Want to give your phone number to that girl you met at that greasy chinese take-out place, and all you had in your pocket was this pen (yeah, no phone... but you're giving her your phone number... and... it's MY review! Go write your own review!) and that greasy napkin you just used to wipe your mouth with? No problem! This pen writes on greasy napkins like a champ! As for my pen? Sure, the spring is a little dated. It is not as "clicky" as the first day. But it's also over 20 years old! Can't question that kind of quality. If pens are disposable for you, keep buying those Bics and Papermates. Those are great pens! If you tend to regularly use one pen, or need a pen to handle certain conditions without fail because you're always on the go, get this one! I've unintentionally tested one, and it PASSED! Remember to get the fisher space pen refills, because that is what really gives these pens "super powers." Also, if you are going to operate in adverse weather conditions, you'll want one of those weather resistant notebooks to match. I buy these items with my own pennies. If my review helped you at all, or you just got a tiny chuckle, share the love! Click on that thumbs up icon! Thanks for reading!
J**H
Good Pen
Very good. I am constantly having issues of pen and paper quality or debris getting in the way of writing. This pen pushes through to let me continue writing.
A**W
Nice quality
Its a nice pen, the click action is super smooth and feels nice, its comfortable and very durable. The cerakote finish is impeccable, extremely scratch resistant and if your hands are going to get oily, wet, or slippery the cerakote helps retain grip which is very helpful. If youre new to Fisher and are unsure how they write, its honestly phenomenal, incredibly smooth, no hickups ever even when you get it in oil. They are my favorite writing pens I own. The blacl cherry color seems more purple in person than in the pictures, its more of a midnight purple than a dark cherry. Since it groups all the variations of this pen that you buy, I also own the Fisher brass finish (non lacquered). It is also another good choice, but the brass ages very very fast, only get that one if you specifically want a weathered looking brass pen after a week of use. Still the weathered and worn look does add character to the pen, I am glad to see Fisher released a lacquered brass version just recently though.
V**.
Solid pen. Wish it clicked nicer
Sturdy? Yes. Reliable? Yes. But I have two issues with this pen. 1) I hate the click mechanism because if you grip too high up the pen you will compress the spring while writing. Now, I don't always write like that but when I'm using a pen to quickly jot notes, sometimes I don't grip it as properly and so this becomes annoying. The click is also rather unsatisfying so if you wanna fidget with this pen your best bet is unscrewing and rescrewing the body of the pen, because the click is kinda disappointing. 2) I don't trust this pen. I have yet to have a leak in my pocket, but because of the nature of the design of this pen I'm worried it'll get clicked open when I put the pocket clip on my pants pocket and an hour later I'll discover a mess. I've yet to have that issue, but a traditional click pen design would seem more trustworthy. I don't like that the pocket clip is on the moving part of the pen. Overall? Solid pen. Has always written reliably when I need it. The body of the pen has a satisfying weight and the threads are neatly cut and it screws together very precisely. It's a rather small pen so if you have a big hands that might be an issue but if you want a small pen? This is a great inexpensive option. This has become my new edc pen and goes everywhere with me. I don't know if it's fair to call it a "tactical" pen because it doesn't have much grip and there's no fixed point to use for self defense, but I'm confident that the metal body of this pen is at least sturdy enough to push into someone's pressure point, should I be forced into a situation where I had to use it for self defense. But if you want a pen that definitely fit for self defense don't get this, but this might be better than defending yourself with your bare hands. All in all, a solidly built reliable pen.
J**S
Awesome Pen
excellent product.. This pen never fails
K**N
BEAUTIFUL RAW BRASS PEN
Just got this in the mail today! I can’t speak of longevity of it . However I can give you my initial thoughts.. great presentation packaging! Upon opening the RAW BRASS pops , absolutely beautiful pen! I have it here in the video next to my solid brass zippo for “somewhat of a comparison” The construction of pen seems to be of great quality! Although it is a little lighter than I thought it would be .. not necessarily a bad thing . I would say weight is good! It screws on and off to get to the refill with no hesitation. Clicking the top part of pen does not feel mushy as some others have said .. I clicked it in my video and you can see and hear the responsiveness of it . Writes very nicely! No complaints here! I would buy again and recommend to a friend! I will update as I use it more! Please note I’m a truck driver / laborer and very very hard on my pens.. I will update!
C**.
Awesome!!!
Best pens I’ve ever had!!! The problem I have is keeping them from my colleagues!
D**R
Practical design for a most reliable ink cartridge.
Even though the Fischer Ballpoint does not write as smoothly or as dark as a Parker Jotter, it is definitely more reliable in cold conditions and for writing on most any surface in any position. The Fischer does what it was designed to do, which is why I purchased it. For years I've been refilling my 3 Parker Jotter pens using the adapter insert that comes with a Fischer Space Pen refill. One in the house, truck, and range bag. Since I was needing to refill the most used Jotter in the house, I decided to try the Matte Black Brass Cap-O-Matic, which is very similar to the small diameter and short length of the Jotter. The all brass Cap-O-Matic is heavier, feels balanced, more solid, and has a slight texture. The click is quiet and easy. The pocket clip is just as durable as the Jotter. Since the upper barrel of the Fischer slides over the lower barrel to extend or retract the nib, it should provided added strength to the brass threads. So I'm pleased and satisfied with this purchase.
M**S
It does what it claims.
Work pen.
Y**G
Stylo inspirant !
Aucune faute pour ce stylo qui écrit sans fautes, obéissant, glissant sans tâche, régulier et inspirant, idéal pour la création !
C**A
Five Stars
Great pen.
R**Z
EXCELENTE PRODUTO
Excelente produto! Vale a pena o investimento!
J**T
il y a un défaut
Le problème est que la circonférence du capuchon n'est pas ébavurée:elle est tranchante si on ne fait pas attention un vrai défaut de conception.
Trustpilot
1 week ago
3 weeks ago