I have a spare 256GB SSD from my 2015 Macbook Pro that I would like to re-use in my PC. I have an Acer laptop that comes with an M2 slot. Are adapters available that would allow me to reuse this SSD in my PC?
Heavily edited answer:
In theory, the answer is yes. But as @benwiggy has pointed out in his comment, as a practical matter, the answer is: "It depends". Apple's proprietary design of the SSD's connector/interface means that an adapter will be needed to use it in a device with one of the industry standard M.2 interfaces. In other words, you can only re-use an Apple SSD in another machine IF you have the correct adapter. Making this still more difficult is the fact that Apple changed the SSD interface design periodically, and so the adapter required may be unique to a model or model year.
Your question has now been closed as duplicative, but in reviewing the duplicated Q&A, it will be noted:
that Q&A pertains to a Macbook Air early 2014 which requires a different adapter than your Macbook Pro 2015, and
some of the links are now broken, meaning some of the recommended adapters and sources are no longer available.
However, ferreting through one of the manufacturer's websites (Sintech) provided in this answer led to this page of macbook SSD adapters which may be of some use. I saw no prices provided on Sintech's website, but another answer stated that his cost was $13.99. You can factor cost & your research time into your tradeoffs for buying a new drive vs. buying an adapter to re-use the Apple SSD. You might also want to consider the environment in your decision.
The SSD module in a 2015 MacBook Pro uses an Apple-proprietary "12+16-pin" connector, which is different from the normal standard m2 connector used on Windows PC computers.
There is a market for adaptors that allow the fitting of generic m2 blades into a Mac's 12+16 socket; but I suspect that adaptors going the other way will be rare.
You can buy 256 GB m2 modules for less money than an adaptor is likely to cost you, even if you find one.