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

Product ID: 262675018

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🎯Precision needle nozzle

⚙️3 oz grease capacity

🖐️One-hand operation

Description

⚙️ Grease smarter, not harder — precision lubrication in the palm of your hand!

COMPACT POWERHOUSE - Mini grease gun designed for tight spaces and precision lubrication.
DURABLE PORTABLE - Heavy-duty build with a sleek, lightweight frame—your go-to tool for on-the-go maintenance.
PRECISION DELIVERY - Needle nozzle targets flush-type mini grease fittings for exact application every time.
SMART GREASE LOADING - Innovative push-up base plate system ensures consistent grease flow and pressure control.
EFFORTLESS ONE HAND USE - Lightweight 1 lb design lets you grease tools with a single hand—no hassle, no mess.

The Astro Pneumatic Tool 101 mini grease gun is a compact, lightweight lubrication tool featuring a 3-ounce grease capacity and a precision needle nozzle. Designed for one-handed operation, it uses a push-up base plate system to maintain consistent grease flow and pressure, making it ideal for air tools and flush-type mini grease fittings. Weighing just 1 lb, it combines durability with portability for efficient maintenance anywhere.

Specifications

Manufacturer	Astro
Part number	APT-101
Item Weight	272 g
Product Dimensions	22.86 x 13.34 x 3.81 cm; 272.16 g
Item model number	101
Color	Original Version
Style	Push Up
Material	Other
Item thickness	10 Inches
Power source type	ac
Item Package Quantity	1
Measurement System	English/Standard
Included components	Needle Nozzle
Batteries Included?	No
Batteries Required?	No

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