Fisher Space Pen Cap-O-Matic 775-GR – a pen for every situation

The Fisher Space Pen Cap-O-Matic is a practical and durable pen that can be operated with one hand. It is suitable for use in the office, construction, medicine, military service, fire safety, and everyday outdoor use.

The 775-GR model features a chrome cap and a green plastic body—an elegant and practical choice.

Space-Proven Technology

The refill contains a pressurized nitrogen gas cartridge. A small metal cylinder pushes out the special thixotropic ink, which is solid at rest but liquefies when writing.

It operates at temperatures ranging from -34°C to +120°C
It works underwater and in zero gravity
It writes at any angle, including upside down
It doesn't break or leak
Lasts up to 3 times longer than standard ink

Design and Materials

The body and structure are made of brass and steel. The tip of the cartridge is a tungsten carbide ball—a material known for its exceptional hardness and durability.

The pen is compact and fits easily into a wallet or organizer. The clip allows it to be attached to the edge of a pocket or backpack.

Hand-tested with a lifetime warranty

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

A great gift for men and women

A pen is a great gift for teachers, doctors, lawyers, military personnel, police officers, business leaders, and high school seniors. Its history and the technology behind it make it an interesting topic of conversation.

The pen doesn't freeze in the winter or leak in the summer—it's reliable in the car, in your everyday bag, or out in the field.

History of the Fisher Space Pen

During the early NASA missions, astronauts used pencils. For Project Gemini in 1965, NASA purchased mechanical pencils at a cost of $128.89 each, which caused public outcry.

Paul S. Fisher of Fisher Pen Co. developed a new ballpoint pen with a pressurized ink cartridge—without funding from NASA. The company invested about $1 million of its own funds and then patented the product.

In 1967, after rigorous testing, NASA equipped the astronauts on the Apollo mission with these pens. Approximately 400 were purchased at a price of $6 each.

In February 1969, the Soviet Union also purchased 100 Fisher pens and 1,000 refills for use on the Soyuz spaceflights. To this day, American astronauts and Russian cosmonauts still use these pens.

Specifications	Value
Brand	Fisher Space Pen
Model	Cap-O-Matic 775-GR
Length	13.7 cm
Housing	Chrome-plated cap, green plastic body
Structural Material	Brass and Steel
Magazine Nozzle	Tungsten carbide ball
Mounting Bracket	Clip
Magazine	Fisher SPR4 – black, medium line width
Compatible Refills	SPR Cartridge Series
Temperature range	-34°C to +120°C
Warranty	Lifetime Warranty Against Manufacturing Defects
Contents of the Set	Pen and Gift Box

Frequently Asked Questions

How does the one-handed activation mechanism on the Fisher Space Pen Cap-O-Matic work?

The Fisher Space Pen Cap-O-Matic features an activation button that allows it to be opened and closed with just one hand. This makes it particularly convenient in situations where the other hand is occupied—for example, while working on a construction site, during medical examinations, or in the field. The mechanism is designed for long-term use and is wear-resistant.

Does this pen really write underwater and in zero gravity?

Yes. The Fisher Space Pen Cap-O-Matic refill contains a pressurized nitrogen gas cartridge. A small metal cylinder pushes the thixotropic ink, which is hermetically sealed. It is this design that allows writing underwater, in zero gravity, and at any angle—including upside down. The pen was used by NASA astronauts during the Apollo missions and by Russian cosmonauts on the Soyuz flights.

What is thixotropic ink, and why is it important?

Thixotropic ink is in a solid or gel-like state when at rest. When writing—that is, when subjected to mechanical pressure—it liquefies and is applied evenly to the surface. This property prevents the ink from spreading or dripping when the pen is not in use. That is precisely why the Fisher Space Pen does not leak even in the heat and does not freeze in the cold.

How long does the refill in this pen last?

The Fisher SPR4 refill included in the set lasts up to three times longer than standard ink. When it runs out, it can be replaced with refills from the Cartridge SPR series, making the pen a long-lasting choice. Replacement is easy and requires no special tools.

Is the Fisher Space Pen Cap-O-Matic 775-GR a good gift?

Yes, this pen is an excellent choice for a gift. It comes in a gift box and is suitable for various occasions—birthdays, anniversaries, graduations, or as a corporate gift. It’s perfect for teachers, doctors, lawyers, military personnel, police officers, and business leaders. The story behind it—linked to NASA’s space missions—makes it interesting and memorable. At Dulotec.COM, it’s available at an affordable price with a lifetime warranty.

What materials is the pen made of?

The Fisher Space Pen Cap-O-Matic 775-GR is constructed of brass and steel. The cap is chrome-plated, and the barrel is made of green plastic. The tip of the refill is made of tungsten carbide—a material known for its high hardness and durability. Each pen is precision-assembled and hand-tested before being released to the market.

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

The Fisher Space Pen Cap-O-Matic comes with a lifetime warranty against all manufacturing defects. Each pen is manually tested before being released to the market. The warranty covers defects in materials and workmanship, but not normal wear and tear from use. This makes it a reliable choice for long-term, everyday use.