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From: Frank <"frank "@frank.net>
Newsgroups: alt.home.repair,rec.autos.tech
Subject: Re: stainless steel bolts
Date: Wed, 6 Nov 2024 13:21:55 -0500
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On 11/6/2024 10:58 AM, Larry Wolff wrote:
> How can I tell if these bolts are stainless steel or not?
> https://i.postimg.cc/8cMgwY4Y/bolts.jpg
> 
> All I know is they're heavy feeling - and magnetic.
> 
> But how do I know if they're stainless short of purposefully rusting them
> by dipping them in acid?

As others point out some grades of stainless are magnetic.

Looking it up I see there are tests you can run:

https://www.waterbottle.tech/simple-methods-for-identifying-stainless-steel/

Been a long time but I remember running tests on various grades to see 
if they would stand up to making polymers under highly acidic 
conditions.  You might do something similar to see if they will hold up 
under the use you are putting them to.