Fisher Space Pen Cap-O-Matic with Cerakote Flat Dark Earth Finish

The Fisher Space Pen Cap-O-Matic M4H265 is a pen with a Cerakote® FDE (Flat Dark Earth) finish—the choice of military personnel, survivalists, hunters, and outdoor enthusiasts. The Cerakote® coating provides resistance to chemicals, corrosion, and heat.

This model was created in honor of military and tactical enthusiasts—there's nothing more tactical than the combination of FDE and Cerakote®.

Cap-O-Matic – Reliability for Any Environment

The classic Cap-O-Matic model is the workhorse of the Fisher Space Pen portfolio. Its one-handed activation makes it convenient for use in offices, construction, medicine, law enforcement, firefighting, and military service.

The body is made of brass with a chrome-plated finish, and the tip of the refill is a tungsten carbide ball. The construction consists of brass and steel.

Technical Specifications for Writing

It operates at temperatures ranging from -34°C to +120°C
It works underwater, in zero gravity, and at any angle
The ink is thixotropic—it is solid in its normal state but liquefies when written with
It doesn't break or leak
It lasts up to three times longer than standard ink
The cartridge contains a pressurized nitrogen gas cartridge

Design and Convenience

The pen is compact—it fits easily in a wallet or organizer. The clip allows you to attach it to a pocket or backpack.

Every Fisher Space Pen is precision-assembled, hand-tested, and comes with a lifetime warranty against manufacturing defects.

A gift for a man that combines history and practical value

Fisher Space Pens make an excellent gift for men and women in various professions—doctors, lawyers, military personnel, police officers, business leaders, teachers, high school seniors, and craftsmen. They are practical, durable, and a pleasure to use.

They're also great to keep in your car or everyday bag—they don't melt in the summer or freeze in the winter.

The History of the Fisher Space Pen

During NASA's early missions, astronauts used mechanical pencils. For the Gemini project in 1965, NASA purchased 34 mechanical pencils for a total of $4,382.50—about $128.89 each. This sparked public criticism, and NASA began looking for alternatives.

Paul S. Fisher of Fisher Pen Co. developed a pressurized-cartridge pen that works in zero gravity, underwater, and at extreme temperatures. The company invested about $1 million of its own funds without funding from NASA, after which it patented the product.

In 1967, after rigorous testing, NASA equipped the Apollo program astronauts with these pens. Approximately 400 were purchased at a price of $6 each. In February 1969, the Soviet Union also purchased 100 pens and 1,000 refills for the Soyuz missions. To this day, American astronauts and Russian cosmonauts continue to use these pens.

Specifications	Value
Brand	Fisher Space Pen
Model	Cap-O-Matic M4H265
Finish	Cerakote® FDE (Flat Dark Earth)
Housing	Brass
Nozzle	Tungsten carbide
Mounting Bracket	Clip
Length	13.7 cm
Temperature range	-34°C to +120°C
Magazine	Fisher SPR4 (black, medium thickness)
Compatible Refills	SPR Cartridge Series
Warranty	Life-long
Contents of the Set	Pen and Gift Box

Frequently Asked Questions

What is Cerakote® FDE coating, and why is it important?

Cerakote® is a specialized coating that provides resistance to chemicals, corrosion, and heat. FDE stands for Flat Dark Earth—a color and finish widely used in tactical gear. This combination makes the pen durable under harsh conditions. The coating is applied to a brass body, which further strengthens the construction.

Can the Fisher Space Pen write underwater and in extreme temperatures?

Yes. The Fisher Space Pen Cap-O-Matic writes reliably underwater, in zero gravity, at any angle, and at temperatures ranging from -34°C to +120°C. This makes it suitable for field conditions, winter activities, and use in vehicles at any time of year. It is precisely these qualities that led NASA to choose it for the Apollo program.

What is thixotropic ink, and how is it different from regular ink?

Thixotropic ink is a special formula that is solid in its normal state. When writing—under pressure from the tip—it liquefies and allows for smooth writing. This means the pen doesn’t leak or skip. The cartridge contains a pressurized nitrogen gas cartridge that pushes the ink toward the tip. Thanks to this technology, the pen writes up to 3 times longer than a pen with standard ink.

Is this pen a good gift for a man?

Definitely yes. The Fisher Space Pen Cap-O-Matic with Cerakote FDE coating is a practical and prestigious gift. It’s perfect for military personnel, police officers, doctors, lawyers, business leaders, teachers, high school seniors, and anyone who appreciates a reliable writing instrument. The set includes a gift box, making it ready to give. At Dulotec.COM, you’ll find this pen at a great price.

What kind of refill does the pen use, and can it be replaced?

The pen comes with a black Fisher SPR4 cartridge and a medium line width. The refill is replaceable and compatible with the entire Fisher Space Pen Cartridge SPR series. This ensures long-term use of the pen without having to replace the entire pen.

What is the history of the Fisher Space Pen, and what is its connection to NASA?

Paul S. Fisher developed the pen without funding from NASA; the company invested about $1 million of its own funds. In 1967, after rigorous testing, NASA approved the pens for the Apollo program. About 400 pens were purchased at a price of $6 each. In 1969, the Soviet Union also purchased 100 pens and 1,000 refills for the Soyuz missions. To this day, astronauts and cosmonauts continue to use these pens in orbit.

What warranty is offered for the Fisher Space Pen Cap-O-Matic?

Every Fisher Space Pen is precision-assembled and hand-tested. The manufacturer offers a lifetime warranty against all manufacturing defects. This is a testament to the product’s quality and durability. If a manufacturing defect is found, the pen is eligible for replacement or repair.