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🖋️ The pen that outlasts your hustle—write beyond limits!
The Fisher Space Pen Military Cap-O-Matic is a pressurized ballpoint pen engineered to write flawlessly in zero gravity, extreme temperatures (-30°F to 250°F), underwater, and at any angle—including upside down. Featuring a durable matte black brass body with a one-handed snap cap and lifetime warranty, it’s the go-to pen for professionals, adventurers, and military personnel who demand unmatched reliability and performance.












| ASIN | B001NXDFC8 |
| Additional Features | Waterproof |
| Age Range Description | Adult |
| Best Sellers Rank | #4,636 in Office Products ( See Top 100 in Office Products ) #112 in Ballpoint Pens |
| Body Shape | Round |
| Brand Name | Fisher |
| Closure Type | Snap |
| Color | Matte Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (9,557) |
| Drill Point | Medium |
| Global Trade Identification Number | 00747609542417 |
| Grip Type | plastic plain grip |
| Hand Orientation | Ambidextrous |
| Hardness | B |
| Ink Base | Water |
| Ink Color | Black |
| Item Diameter | 0.38 Inches |
| Item Dimensions | 5.25 x 0.5 x 0.5 inches |
| Item Weight | 0.01 Ounces |
| Line Size | 1.1 Millimeters |
| Manufacturer | Fisher Space Pen |
| Material Type | Multi |
| Model Number | SM4B |
| Style | Original Packaging |
| UPC | 747609542417 |
| Unit Count | 1 Count |
| Warranty Description | Lifetime parts and labor. |
| Water Resistance Level | Water Resistant |
| 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!
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.
B**Y
The best ball point pen!
I have used Space Pens since the middle 70‘s. They are my favorite pens and I have continued to use them. I tend to lose one before it runs out of ink. I found early on that a Space Pen refill would fit a Parker body and make a reasonable substitute for a genuine Space Pen, but, for some reason, the refill stopped working quite so well in Parker bodies. They would jam and be difficult to use. When I saw an original Space Pen on Amazon, I ordered two. They work perfectly, and my writing happiness is complete. The story is that NASA spent millions on research to make a pen that writes upside down, in a vacuum, under water, and when it stops writing, really is out of ink. The Soviets gave the Cosmonauts pencils. I thought, “Why should all that research go to waste?”
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.
R**S
Great for note takers and report writers.
These are great ink pens. I have ordered a few because I tend to loose them or they get taken, I recommend getting them in color so people want take them by mistake. They are a bit pricey but it’s also an appropriate fidget device. 😊
B**W
How can I have gotten this far this long without this wonderful pen?
Outstanding pen! I'm writing a novel, and do almost all of my riding by dictating into my phone, while lounging horizontally. When I print out copies to revise, I can never find a pen that will work when I hold the work up where I can read it. Other pens either: 1. run out of ink because of the angle and have to be reset flat; 2. Dry out almost immediately, if they are fiber pin; or 3. Skip over any place my oily hand might have been on the page. This wonderful pen does absolutely none of that. It writes perfectly from any angle, over every part of the page, for as long as I want to. I can lay it aside without having to put a cap on it, and then pick it up and use it again immediately. After only one day of owning it, I wonder how I could have used anything else. I am a customer for life. This pen works every bit as well as space pens they cost over twice as much. I highly recommend it!
M**S
Work pen.
Y**G
Aucune faute pour ce stylo qui écrit sans fautes, obéissant, glissant sans tâche, régulier et inspirant, idéal pour la création !
C**A
Great pen.
J**N
Works perfect, writes nice
R**Z
Excelente produto! Vale a pena o investimento!
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