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

Product ID: 254895579

Details

Brand
Fisher
Item dimensions L x W x H
8.9 x 0.5 x
Item weight
0.03 Pounds
Number of pieces
1
Style
Refill refills

🖊️Writes at any angle, zero gravity ready

🛠️All brass & steel, lifetime guaranteed

❄️🔥Operates from -30°F to 250°F

51.89 DT

Duties & taxes included

In stock

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Description

🖊️ Write like a space explorer—anywhere, anytime.

WRITE BEYOND LIMITS - Fine blue ink that flows flawlessly even upside down or in zero gravity—because your ideas don’t wait for perfect conditions.
SEAMLESS COMPATIBILITY - Perfectly designed to fit Fisher Space Pen models, making refills effortless and ensuring your pen stays mission-ready.
BUILT TO LAST A LIFETIME - Crafted with premium brass and steel, precision assembled and hand-tested, backed by a lifetime guarantee against defects.
TRUSTED BY PROFESSIONALS - Join thousands of satisfied users with a 4.7-star rating—because excellence is contagious.
EXTREME TEMPERATURE PROOF - From Arctic chills to desert heat, this refill performs consistently between -30°F and 250°F—reliability you can count on anywhere.

The Fisher Space Pen Ballpoint Refill in fine blue ink delivers unmatched versatility by writing at any angle, including zero gravity, and performing reliably in extreme temperatures from -30°F to 250°F. Constructed from durable brass and steel, each refill is precision assembled, hand tested, and backed by a lifetime guarantee, making it the go-to choice for professionals who demand performance and longevity.

Specifications

ASIN	B00168YNEO
Best Sellers Rank	#15,249 in Office Products ( See Top 100 in Office Products ) #125 in Pen Refills
Brand Name	Fisher
Country of Publication	USA
Customer Reviews	4.7 4.7 out of 5 stars (4,331)
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	0.03 Pounds
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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