Replacement Cartridge for the Fisher Space Pen PR Series Pressurized Pen – SPR4F

The Fisher Space Pen is synonymous with reliability when writing in extreme conditions. The PR (Pressurized Refill) series refill, with a line width of 0.9 mm, lasts three times longer than standard refills.

Each refill provides over 3,600 meters of writing—depending on the surface and how it is used.

Writing Under Any Conditions

The ball is made of tungsten carbide—an extremely hard material that ensures a consistent line in all weather conditions. The ink is thixotropic and hermetically sealed in a pressurized reservoir.

An internal separator separates the ink from the pressurized nitrogen, allowing for writing in unusual situations.

Key Benefits

It lasts three times longer than a regular refill
It works underwater, at any angle, and at temperatures ranging from -35°C to +121°C
Tungsten carbide ball for a durable and precise line
Thixotropic ink in a pressurized tank
An internal separator separates the ink from the nitrogen
Includes a white adapter that extends the refill by 2.5 cm for compatibility with Parker and similar pens
Compatible with all Fisher Space Pen ink types, except for the Q4 model
Ink color: black
Line thickness: 0.9 mm (medium)
Magazine length: 8.9 cm
Cap length: 2.5 cm
Exceptionally long shelf life—over 100 years of storage

Specifications	Value
Brand	Fisher Space Pen
Model	SPR4F
Series	PR (Pressurized Refill)
Ink Color	Black
Line thickness	0.9 mm
Magazine Length	8.9 cm
Cap Length	2.5 cm
Writing Resource	over 3,600 m
Ball Material	Tungsten carbide
Ink Type	Thixotropic, under pressure
Temperature range	-35°C to +121°C
Contents of the Set	Refill and white adapter for Parker
Ink Life	over 100 years

Frequently Asked Questions

What types of chemicals is the Fisher Space Pen SPR4F refill suitable for?

The SPR4F refill is compatible with all Fisher Space Pen pens, with the exception of the Q4 model. In addition, thanks to the included white adapter, it can also be used in Parker pens and other similar models. The adapter extends the refill by 2.5 cm, ensuring it fits properly in longer pen bodies.

How long does the Fisher Space Pen PR Series refill last?

The refill provides over 3,600 meters of writing, which is three times more than a standard refill. The exact lifespan depends on the surface and writing style. In addition, the ink retains its quality for over 100 years, making it an exceptionally long-lasting choice.

At what temperatures does the Fisher Space Pen SPR4F refill work?

The refill operates within a temperature range of -35°C to +121°C. The thixotropic ink, sealed under pressure, ensures reliable writing in cold, hot, and all weather conditions. This makes it suitable for outdoor use, in the field, or in extreme environments.

Can the pen write underwater or at an angle?

Yes. The pressurized system allows for writing underwater, at any angle, including downward. The internal separator separates the ink from the pressurized nitrogen and ensures a constant flow regardless of the pen’s position. This is precisely what makes the PR series pens the preferred choice for specific conditions of use.

What is the line width and the ink color?

The SPR4F refill features a line width of 0.9 mm and black ink. This line width is classified as medium and produces a clear, legible line. The PR series is available in a variety of ink colors and line widths, so you can choose the option that best suits your preferences.

What is the ball in the magazine made of?

The tip is made of tungsten carbide—one of the hardest materials used in the manufacture of writing instruments. This ensures exceptional durability and consistent line width even with prolonged use. Tungsten carbide guarantees reliable writing even on uneven surfaces.

What are the dimensions of the Fisher Space Pen SPR4F refill?

The cartridge is 8.9 cm long, and the cap is 2.5 cm long. With the included white adapter, the total length increases by an additional 2.5 cm, allowing it to be installed in pens with larger bodies, such as those made by Parker. The refill comes in blister packaging and is ready to use immediately upon purchase.

Original price was: 10,00 €.Current price is: 9,00 €.

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SKU: d-06-15-348 Categories: Ballpoint Pen Refills, Gifts for men, Luxury Pens

Description

Specifications	Value
Brand	Fisher Space Pen
Model	SPR4F
Series	PR (Pressurized Refill)
Ink Color	Black
Line thickness	0.9 mm
Magazine Length	8.9 cm
Cap Length	2.5 cm
Writing Resource	over 3,600 m
Ball Material	Tungsten carbide
Ink Type	Thixotropic, under pressure
Temperature range	-35°C to +121°C
Contents of the Set	Refill and white adapter for Parker
Ink Life	over 100 years

Additional information

Weight	0,01 kg

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About brand

The Space Pen—also known as the Zero Gravity Pen—is a pen that, thanks to its patented sealed pressurized ink cartridge, will write under almost any conditions (underwater and at extreme temperatures) and on almost any surface (greasy or wet paper and at any angle). These pens were first used in 1968 on the Apollo 7 mission. Since then, the Fisher Space Pen has been part of every NASA manned spaceflight. The products have also been used by the Russian and Chinese space programs! The Space Pen—a product that works under virtually any conditions. Whether upside down or floating in zero gravity, it doesn’t matter—these pens will get the job done. Write anytime, anywhere!