Fisher Space Pen SPR4F Pressurized Ballpoint Pen Refill, Fine Point, Black Ink

Unlike ordinary refills that rely on gravity and can skip or fail in extreme conditions, the Fisher Space Pen SPR4F refill contains a sealed, pressurized thixotropic ink cartridge. It writes at any angle, even upside down, and performs in environments where conventional pens cannot—underwater, over grease, and in zero gravity. This fine point refill delivers a consistent 0.8 mm line width with black ink, making it a dependable choice for professionals, outdoor enthusiasts, and anyone who needs a pen that works everywhere.

Highlights

• Pressurized thixotropic ink writes in zero gravity, underwater, over grease, and at any angle
• Fine point (F) with tungsten carbide ball for smooth, precise writing
• Black ink with high smudge and fade resistance, instant dry on most surfaces
• Wide operating temperature range from -34°C to 121°C (-30°F to 250°F)
• Exceptional write-out length of up to 3,000 meters
• Compatible with all Fisher Space Pens and Parker-style G2 pens
• Sealed, pressurized cartridge with a 100-year shelf life

In daily use

This refill turns your Fisher Space Pen into a reliable tool for any situation. Whether you are jotting notes in a freezing warehouse, signing documents in a wet environment, or simply want a pen that never fails, the SPR4F delivers consistent performance. The fine point is ideal for detailed writing, and the instant-dry black ink prevents smudging on most surfaces. With a write length of up to 3,000 meters, it lasts significantly longer than standard refills, reducing the need for frequent replacements.

Full specifications

• Product type: Ballpoint pen refill
• Ink colour: Black
• Point size: Fine (F)
• Line width: 0.8 mm
• Ink type: Pressurized thixotropic ink
• Refill series: PR Series
• Compatibility: All Fisher Space Pens, Parker-style G2 compatible pens
• Ballpoint material: Tungsten carbide
• Tip material: Stainless steel
• Operating temperature range: -34°C to 121°C (-30°F to 250°F)
• Shelf life: 100 years
• Write length: Up to 3,000 meters
• Smudge resistance: High
• Fade resistance: High
• Drying time: Instant dry on most surfaces
• Quantity: 1 refill

Final note

The Fisher Space Pen SPR4F refill is the original pressurized refill that has been used on every manned space flight since 1968. Trusted by astronauts and adventurers, it delivers unmatched reliability in the harshest conditions. Upgrade your pen with the refill that writes anywhere.