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 Ballpoint Refill Fine Blue/Sensa&parkr

Fisher Space Pen Ballpoint Refill Fine Blue/Sensa&parkr

Product ID: 254895579

Details

Brand
Fisher Space
Item dimensions L x W x H
8.9 x 0.5 x
Item weight
14 g
Number of pieces
1
Style
Refill refills

🖊️Writes at any angle, zero-G ready

🛠️All brass & steel, lifetime guaranteed

❄️🔥Operates from -30°F to 250°F

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6029 som

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Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖋️ Write beyond limits — because your ideas deserve a pen as unstoppable as you.

SEAMLESS COMPATIBILITY - Perfectly fits Fisher Space Pen models and tactical pens alike, ensuring you never miss a beat in style and function.
BUILT TO LAST A LIFETIME - Crafted from premium brass and steel, precision assembled and hand-tested for durability that outlasts trends.
WRITES ANYWHERE ANYTIME - Zero gravity? No problem. This refill delivers flawless ink flow in any position, even upside down or in space.
EXTREME TEMPERATURE PROOF - From Arctic chills to desert heat, your writing stays smooth and consistent between -30°F and 250°F.
BOLD BLUE INK THAT ENDURES - Rich, vibrant blue ink designed to last for years, making every note and signature stand out with confidence.

The Fisher Space Pen Ballpoint Refill Fine Blue/Sensa&parkr is a precision-engineered pen refill that writes smoothly at any angle, including zero gravity. It performs reliably in extreme temperatures from -30°F to 250°F and is constructed from durable brass and steel. Hand-tested and backed by a lifetime guarantee, this refill delivers bold blue ink that lasts for years, making it the ultimate choice for professionals who demand versatility and longevity.

Specifications

ASIN	B00168YNEO
Best Sellers Rank	#5,763 in Office Products ( See Top 100 in Office Products ) #35 in Pen Refills
Brand Name	Fisher Space Pen
Customer Reviews	4.7 4.7 out of 5 stars (4,258)
Global Trade Identification Number	00747609111118, 07476091111186
Included Components	9004524
Ink Color	Blue
Item Dimensions	8.9 x 0.5 x 0.5 centimeters
Item Weight	14 g
Manufacturer	Fisher Space Pen
Manufacturer Part Number	SPR1F
Model Number	SPR1F
Number of Pieces	1
Package Size Name	Single
Point Type	Fine
Style	Refill refills (PR series)
UPC	097914378943 047609111119 747609111118
Unit Count	1 Count

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