does this refill fit the AG7 model pen?

I am not sure. The packaging doesn't reference which Fisher pens this refill will work with, but it comes with an adapter which makes it longer. I use it without the adapter for the Fisher Space Bullet pen. According to the description on Amazon, this refill should fit most Fisher pens.

Anybody know the actual size of the tip?

I'm not exactly sure what Tip your talking about but the end of the cartridge is just under 3/32" (0.086") which is just above 1/16" and the ball is about 3/64" (0.0469") which is just below 1/16". if you need more clarification I can measure the cartridge more.

will this fit a cross pen?

No, it fits Parkers ( with the adapter) and fisher

Will it fit in the ti-pocket pro? (big idea company llc)

I watched the ti-pocket pro video and I would say no.

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Fisher Space Pen - 3 Pressurized Cartridges Blue Ink Fine Point #SPR1F

Fisher Space Pen - 3 Pressurized Cartridges Blue Ink Fine Point #SPR1F

Product ID: 284205122

Details

Brand
Fisher Space
Item dimensions L x W x H
22.9 x 15.2 x
Number of pieces
3
Point type
Fine
Style
Space

🖊️Writes at any angle, even zero-G

🛠️Durable brass & steel build

❄️🔥Operates from -30°F to 250°F

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€ 43.93

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖋️ Write like a pro, anywhere—even in space!

WRITE BEYOND LIMITS - Effortlessly jot notes upside down, sideways, or in zero gravity—because your ideas don’t wait for perfect conditions.
TRIPLE INK POWER PACK - Three fine-point blue ink refills per order keep you stocked and ready for every critical moment.
BUILT TO LAST A LIFETIME - All brass and steel construction ensures a rugged, premium feel that withstands daily hustle and adventure.
EXTREME TEMPERATURE PROOF - From Arctic chills to desert heat, your pen keeps flowing smoothly between -30°F and 250°F.
RELIABLE INK THAT WONT QUIT - Pressurized cartridges guarantee ink flows instantly—even after years of storage, so you’re never caught empty-handed.

The Fisher Space Pen #SPR1F features pressurized blue ink cartridges that write flawlessly at any angle, including zero gravity, and in extreme temperatures from -30°F to 250°F. Crafted with durable brass and steel, this fine-point pen refill set includes three long-lasting cartridges made in the USA, trusted for reliability and performance when it matters most.

Specifications

ASIN	B00DAVGKGY
Best Sellers Rank	#73,617 in Office Products ( See Top 100 in Office Products ) #748 in Pen Refills
Brand Name	Fisher Space Pen
Country of Publication	USA
Customer Reviews	4.7 4.7 out of 5 stars (469)
Ink Color	Blue
Item Dimensions	22.9 x 15.2 x 0.5 centimeters
Manufacturer	Fisher Space
Manufacturer Part Number	BUN-SPR1F-x3
Model Number	BUN-SPR1F-x3
Number of Pieces	3
Package Size Name	3-Pack
Point Type	Fine
Style	Space
UPC	637122808612
Unit Count	3 Count

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