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 Refill, Blue Fine

Fisher Space Pen Point Refill, Blue Fine

Product ID: 169648531

Details

Brand
Fisher
Item Weight
0.03 Pounds
Item dimensions L x W x H
8.9 x 0.5 x
Number of Pieces
1
Style
Military

🖊️Writes at any angle, zero gravity ready

🛠️Durable all brass & steel build

❄️🔥Operates from -30°F to 250°F

$103.96

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖋️ Write like a space explorer—no limits, just ink.

WRITE BEYOND LIMITS - Experience flawless ink flow even upside down or in zero gravity—because your ideas don’t wait for gravity.
UNIVERSAL COMPATIBILITY - Fits a wide range of iconic Fisher Space Pen models and Parker-style pens—upgrade your writing game effortlessly.
BUILT TO LAST A LIFETIME - Crafted with premium brass and steel, this refill withstands the rigors of your busiest days and wildest adventures.
TRUSTED BY PROFESSIONALS - Join thousands of high achievers who rely on the #1 refill for precision, reliability, and style.
EXTREME TEMPERATURE PROOF - From Arctic chills to desert heat, your pen keeps pace with your hustle without skipping a beat.

The Fisher Space Pen Point Refill in Blue Fine delivers unmatched versatility with pressurized ink that writes smoothly at any angle, including zero gravity. Engineered to perform in extreme temperatures from -30°F to 250°F, its durable brass and steel construction ensures longevity. Compatible with multiple Fisher Space Pen models and Parker-style pens, this refill is the trusted choice for professionals seeking reliable, precision writing anywhere—on Earth or beyond.

Specifications

ASIN	B00168YNEO
Best Sellers Rank	#74,982 in Office Products ( See Top 100 in Office Products ) #13,152 in Pens & Refills
Brand Name	Fisher
Country of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (2,020)
Global Trade Identification Number	00747609111118, 07476091111186
Included Components	9004524
Ink Colour	Blue
Item Dimensions	8.9 x 0.5 x 0.5 Centimeters
Item Type	Refill
Item Weight	0.03 Pounds
Manufacturer	Fisher
Manufacturer Part Number	SPR1F
Model number	SPR1F
Number of Pieces	1
Package Size Name	Single
Point Type	Fine
Style Name	Military
UPC	097914378943 047609111119 747609111118
Unit Count	1.0 Count

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