Fisher Space Pen Cap-O-Matic Ceracote O.D. Green M4H240 in a gift box

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The Fisher Space Pen Cap-O-Matic with a Cerakote O.D. Green finish is a pen designed for people who won’t compromise on reliability. Its tactical olive-green color makes it a favorite among military personnel, hunters, first responders, and outdoor enthusiasts.

The M4H240 model features a brass body with an elegant chrome finish. The Cerakote® coating provides high resistance to chemicals, corrosion, and heat.

A pen that writes on anything

Fisher Space Pen technology was developed for NASA and continues to serve astronauts to this day. The pen works at temperatures ranging from -34°C to +120°C, underwater, in zero gravity, and at any angle.

It writes three times as long as standard ink
The ink is thixotropic—solid at rest, it liquefies when writing
It doesn't leak or cut out
The tip is made of tungsten carbide
The cartridge contains pressurized nitrogen in a hermetically sealed cylinder

One-Handed Activation

The Cap-O-Matic mechanism allows for one-handed operation. This makes it extremely convenient for law enforcement officers, firefighters, medical professionals, and anyone whose one hand is occupied.

Compact—13.7 cm long
It fits easily in a wallet or organizer
Clip for attaching to a pocket or backpack

A Gift for a Man Who Appreciates History and Technology

Every Fisher Space Pen is precision-assembled, hand-tested, and comes with a lifetime warranty against manufacturing defects. The pen comes in a gift box—the perfect choice for teachers, doctors, military personnel, business leaders, and anyone who values quality.

It's also great for everyday use in the car or in your purse—it doesn't freeze in the winter or run in the summer.

History of the Fisher Space Pen

During NASA's early missions, astronauts used pencils. In 1965, Paul S. Fisher designed a pen with a pressurized ink cartridge that works in zero gravity, underwater, and at extreme temperatures. The company invested about $1 million of its own funds in the development and then patented the product.

In 1967, NASA equipped the astronauts on the Apollo mission with these pens. In February 1969, the Soviet Union also purchased 100 Fisher pens and 1,000 refills for the Soyuz missions. To this day, American astronauts and Russian cosmonauts continue to use this technology.

Specifications	Value
Brand	Fisher Space Pen
Model	M4H240 Cap-O-Matic
Finish / Coating	Cerakote O.D. Green
Color	Olive green
Housing Material	Brass and Steel
Magazine Nozzle	Tungsten carbide
Length	13.7 cm
Mounting Bracket	Clip
Magazine	Fisher SPR4 (black, medium thickness)
Compatible refills	SPR Cartridge Series
Operating temperature	-34°C to +120°C
Warranty	Life-long
Contents of the Set	Pen and Gift Box

Frequently Asked Questions

What makes the Fisher Space Pen Cap-O-Matic different from a regular ballpoint pen?

The Fisher Space Pen Cap-O-Matic uses a pressurized ink cartridge containing nitrogen in a hermetically sealed cylinder. The ink is thixotropic—it is solid at rest but liquefies when writing. This allows the pen to write in zero gravity, underwater, at any angle, and at extreme temperatures ranging from -34°C to +120°C. Ordinary pens cannot function under these conditions. The refill lasts about three times longer than standard ink. The tip is made of tungsten carbide, which ensures smooth and consistent writing.

What is Cerakote coating, and why is it important?

Cerakote is a specialized coating that provides high resistance to chemicals, corrosion, and heat. It transforms the pen into a durable tool suitable for use in harsh outdoor conditions. The O.D. Green finish is a tactical olive-green color that has been favored by military personnel and security professionals for decades. The combination of the Cerakote finish and the brass barrel makes this pen both sturdy and aesthetically pleasing.

How does the Cap-O-Matic mechanism work?

The Cap-O-Matic mechanism allows you to activate the pen with just one hand. A single press is all it takes to extend the pen to its writing position. This is particularly convenient in situations where the other hand is occupied—for example, for law enforcement officers, firefighters, medical professionals, or military personnel. It is precisely this feature that makes the model so popular among people in dynamic professions.

What warranty is provided for the Fisher Space Pen?

Every Fisher Space Pen is precision-assembled and hand-tested. The pen comes with a lifetime warranty against all manufacturing defects. This means that if a manufacturing defect is found, the product will be replaced or repaired. The warranty is further proof of the brand’s quality and reliability.

Is this pen a good gift?

The Fisher Space Pen Cap-O-Matic Cerakote O.D. Green is an excellent gift for men and women in various professions. The pen comes in a gift box, making it ready to give without any additional wrapping. It is suitable for military personnel, doctors, lawyers, business leaders, police officers, teachers, and graduates. It combines practicality, history, and unique technology, making it a memorable and valuable gift.

What type of refill is used, and can it be replaced?

The pen comes with a black Fisher SPR4 refill with a medium line width. The refill is compatible with the entire Fisher Space Pen SPR Cartridge series. Replacing it is easy and requires no special tools. When the ink runs out, you can purchase a new refill from the same series and continue using the pen body.

How is the Fisher Space Pen connected to NASA's space missions?

During the early space missions, astronauts used pencils. Paul S. Fisher developed a ballpoint pen with a pressurized ink cartridge entirely with private funds—about 1 million U.S. dollars. In 1967, NASA equipped the Apollo mission astronauts with these pens after rigorous testing. Media reports indicate that approximately 400 pens were purchased at a price of $6 each. In February 1969, the Soviet Union also purchased 100 Fisher pens and 1,000 refills for the Soyuz missions. To this day, astronauts and cosmonauts continue to use this technology in orbit.