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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🖋️ Write beyond limits—because your ideas deserve the best.

PRECISION FINE POINT - Crafted for sharp, clean lines that elevate your professional notes and sketches.
ICONIC FISHER QUALITY - Made in the USA, trusted by astronauts and professionals alike—join the elite circle of users.
ZERO GRAVITY WRITING MASTERY - Effortlessly jot notes even in weightless environments—because your ideas don’t wait for gravity.
EXTREME TEMPERATURE RESILIENCE - From Arctic chills to desert heat, this refill performs flawlessly, ensuring reliability wherever you are.
PREMIUM ALL METAL CONSTRUCTION - Solid brass and steel components deliver unmatched durability and a sleek, executive feel.

The Fisher Space Pen Point Refill in Blue Fine combines cutting-edge ink technology with rugged brass and steel construction, enabling smooth writing at any angle—even in zero gravity—and reliable performance across extreme temperatures from -30°F to 250°F. Made in the USA, this refill is the ultimate choice for professionals who demand precision and durability.

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Manufacturer	Fisher
Brand	Fisher
Model Number	SPR1F
Colour	Blue
Material	Ink
Number of Items	1
Size	1 count (Pack of 1)
Point Type	Fine
Ink Colour	Blue
Manufacturer Part Number	SPR1F
Manufacturer	Fisher
Country of Origin	USA

Fisher Space Pen Point Refill, Blue Fine

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