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 at any angle, even upside down

🌡️Works -30°F to 250°F

🖊️12,000+ feet writing range

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Description

🖋️ Write Beyond Limits — Because Ordinary Ink Just Won't Cut It

BOLD BLACK PRECISION - Bold point refill delivers crisp, professional lines that stand out in every meeting.
LIFETIME RELIABILITY - Backed by a lifetime guarantee, this refill keeps your EDC pen mission-ready.
TRUSTED BY THE ELITE - Used by astronauts, engineers, and explorers—join the ranks of high achievers.
UNSTOPPABLE INK FLOW - Writes smoothly on almost any surface, from zero gravity to underwater.
EXTREME CONDITION READY - Performs flawlessly in temperatures from -30°F to 250°F—no environment too harsh.

The Fisher Space Pen Point Pressurized Refill in Black Bold is a high-performance ink cartridge designed to write smoothly in extreme conditions, including zero gravity, underwater, and extreme temperatures (-30°F to 250°F). Compatible with most Fisher Space Pens (excluding Infinium and Stick models), it delivers over 12,000 feet of writing with bold, crisp lines. Trusted by astronauts and professionals worldwide, this refill comes with a lifetime guarantee, ensuring your everyday carry pen is always ready for any challenge.

Specifications

ASIN	B000FTGCFI
Best Sellers Rank	#63,849 in Office Products ( See Top 100 in Office Products ) #495 in Ink Pen Refills
Brand Name	Fisher Space Pen
Customer Reviews	4.7 4.7 out of 5 stars (3,377)
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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4787 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kyrgyzstan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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The product quality is outstanding. Exactly what I needed for my work.

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