Will this take 3 oz cartridges?

I don't think so. This Grease Gun is made to be individually loaded from the top (it unscrews), and there are NO springs inside the big tube to force the grease up and out. This is a very old, and very good design dating back (at least) to the 1920's and the plunger works by creating a vacuum of pulling the grease up from the tube, while pushing it into the zerc fitting. I got it use on a few old 1920 era motorcycles and found it would work on more modern design zerc fittings. To fill it, you need to unscrew the top, force the metal follower down to the bottom of the tube, and fill the grease from a tub. I only use Moly based grease and need a tongue depressor to fill the tube. There are a few explanation videos on u-tube. Bottom line - it works, it is much cheaper to operate than a 'modern cartridge type' and it will work on any size zerc. For the money you can't go wrong.

Anyone know the correct fitting to allow standard grease gun fitting to be adapted to this mini grease gun?

You can, this and the other grease guns like this are all copies of the original lincoln lubrigun from the 1920-1950's. I own an original one from the 1950's and it came with a zerk adapter in addition to the needle. These came in tool kits packaged with most new tractors back in the day.

Will it work on a chainsaw?

Yes it will! . I bought for my chainsaw and it worked so well I ordered a second. Both work great and I keep one in each case. I did have to file the tip back about .025 so the tips taper sealed the bar hole completely...........takes about 30 seconds to do with a fine metal file...

does it come with grease?

No, u can use any kind of grease, I use mine 4 my air tools, wen I use to work on airplanes, I used that type of grease for the air tools, but I also have another Astro 101 for automotive grease, for those small amounts u need.

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Astro Pneumatic Tool 101 Mini Grease Gun

Astro Pneumatic Tool 101 Mini Grease Gun

Product ID: 5279330

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⚡One-hand operation

🎯Precision needle nozzle

🛠️3 oz grease capacity

Description

🛠️ Grease smarter, not harder — the mini tool with major impact!

COMPACT POWERHOUSE - Mini size packs a 3-ounce lubricant punch for on-the-go efficiency.
PRECISION DELIVERY - Needle nozzle targets hard-to-reach fittings with exact lubrication every time.
SMART GREASE FEEDING - Innovative bottom-side grease pack with pressure plate ensures consistent flow.
DURABLE LIGHTWEIGHT - Heavy-duty build at just 1 lb—easy to handle without fatigue.
EFFORTLESS ONE HAND USE - Designed for seamless single-handed operation, boosting your productivity.

The Astro Pneumatic Tool 101 Mini Grease Gun is a lightweight, heavy-duty lubrication tool featuring a precision needle nozzle and a 3-ounce grease capacity. Engineered for one-handed use, it offers efficient grease delivery to tight fittings with an innovative bottom-side grease pack system. Perfect for professionals seeking reliable, portable maintenance solutions backed by a 1-year warranty.

Specifications

Manufacturer	Astro
Part Number	APT-101
Item Weight	9.6 ounces
Product Dimensions	9 x 5.25 x 1.5 inches
Item model number	101
Is Discontinued By Manufacturer	No
Material	Other
Power Source	ac
Item Package Quantity	1
Included Components	Needle Nozzle
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 yr warranty on material and workmanship

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