Is there a difference between the spr4 and the pr4?

The "PR" stands for Pressurized Refill and the PR4 is the black refill that fills most of the standard Fisher Space pens and other similar pens. If the code ends in a "B", then it's a bold, or ends in a "F" then it's a fine point. The numeric value after the PR indicates the color (1= blue 2=red, 3=green, 4=black, etc. I believe that the "SPR" simply means that the package includes the little plastic adapter piece that makes the refill Parker compatible. All my refills are the SPR version and work in either Fisher Space Pens (without the plastic adapter) or in my Parker Jotter pens (with the adapter). BTW - Fisher also makes refills with a label "C" like C1 or C4 which are for Cross pens.

Will this refill work in a Bullet space pen?

Greg K,This refill does work correctly in several Bullet Space Pens I purchased!

What is the tip size? I like a solid 1.0, would that be medium or bold?

I would have to say this is more of a medium than a bold. Most 1.0 pens that I have purchased like the Pilot G-2 or Uniball 207 Gel Impact are bold, which I prefer. The Fisher Space Pen refill is less so to me, but still good. What I REALLY like about the Fisher is how exceptionally smooth the ink flow is.

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Fisher Space Pen Bold Point Pressurized Cartridge Refill, Black Ink, 1 Pack

Fisher Space Pen Bold Point Pressurized Cartridge Refill, Black Ink, 1 Pack

4.7/5

Product ID: 19162461

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Details

Brand
Fisher Space
Style
Bold Point
Item dimensions L x W x H
3.5 x 0.2 x
Point Type
Bold
Item Weight
0.01 Kilograms

🔄Writes at any angle, even upside down

🌡️Writes from -30°F to 250°F

🖊️Pressurized cartridge for smooth ink flow

Description

🖤 Bold ink that defies gravity and temperature—because your ideas deserve no limits.

COMPACT DURABLE - Brass cartridge design weighing just 0.35 oz, built to last through your busiest days.
TRUSTED BY THE PROS - Used by astronauts, engineers, and adventurers who demand precision and durability.
VERSATILE COMPATIBILITY - Fits all Fisher Space Pens except Infinium and Stick models for seamless upgrades.
EXTREME TEMPERATURE PROOF - Reliable performance from freezing cold to scorching heat (-30°F to 250°F).
WRITE BOLD WRITE ANYWHERE - Pressurized refill ensures consistent black ink flow on any surface, any angle.

The Fisher Space Pen Bold Point Pressurized Cartridge Refill delivers smooth, bold black ink that writes flawlessly at any angle, even upside down. Engineered to perform in extreme temperatures from -30°F to 250°F, this refill is trusted by astronauts and professionals alike. Compatible with most Fisher Space Pens, its durable brass construction ensures long-lasting reliability for everyday and extreme use.

Specifications

Manufacturer	Fisher Space Pen
Brand	Fisher Space Pen
Item Weight	0.352 ounces
Product Dimensions	3.5 x 0.2 x 0.2 inches
Item model number	SPR4B
Is Discontinued By Manufacturer	No
Color	Black
Material Type	brass
Number of Items	1
Size	1 Count (Pack of 1)
Point Type	Bold
Ink Color	Black
Manufacturer Part Number	SPR4B

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Excellent communication throughout the order process. Product is perfect.

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