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 Point Pressurized Refill, Black Bold - SPR4B- Perfect for Your EDC Pen

Product ID: 19162461

Details

Brand
Fisher Space
Item Weight
0.01 kg
Item dimensions L x W x H
3.5 x 0.2 x
Number of Pieces
1
Style
Bold Point

🔄Writes smoothly at any angle

❄️Works from -30°F to 250°F

🖊️Pressurized refill writes anywhere

VT6084

Duties & taxes included

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Description

🚀 Bold ink that defies gravity and limits

LIFETIME GUARANTEE - Confidence backed by a lifetime warranty—because your ideas deserve the best.
TRUSTED BY THE PROS - Used by astronauts, engineers, and explorers for unmatched durability and precision.
SEAMLESS EDC UPGRADE - Fits all Fisher Space Pens (except Infinium & Stick) for instant pen power boost.
WRITE BOLD WRITE ANYWHERE - Pressurized cartridge ensures flawless ink flow even upside down or underwater.
EXTREME CONDITIONS NO PROBLEM - Reliable performance from freezing cold to scorching heat (-30°F to 250°F).

The Fisher Space Pen Point Pressurized Refill in Black Bold delivers smooth, reliable writing in any environment—from zero gravity to extreme temperatures. Compatible with most Fisher Space Pens, this refill is trusted by astronauts and professionals alike, featuring a pressurized cartridge that writes upside down, underwater, and through grease. Backed by a lifetime guarantee, it’s the ultimate upgrade for your everyday carry pen.

Specifications

ASIN	B000FTGCFI
Best Sellers Rank	#58,413 in Office Products ( See Top 100 in Office Products ) #350 in Ink Pen Refills
Brand Name	Fisher Space Pen
Customer Reviews	4.7 4.7 out of 5 stars (3,364)
Global Trade Identification Number	00747609113419
Ink Color	Black
Item Dimensions	3.5 x 0.2 x 0.2 inches
Item Weight	0.01 kg
Manufacturer	Fisher Space Pen
Manufacturer Part Number	SPR4B
Model Number	SPR4B
Number of Pieces	1
Point Type	Bold
Style	Bold Point
UPC	747609113419
Unit Count	1 Count
Warranty Description	Lifetime Guarantee

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