Is Stainless Steel Magnetic? | Fasteners 101

Is Stainless Steel Magnetic? | Fasteners 101


Welcome back to Albany County Fasteners – Fasteners 101 The question of the day: “Is stainless steel magnetic?” Let’s get started. So I have here some nuts, a lock washer, dowel pin, a hex cap screw or tap bolt all of these items here are 316 stainless and you may be able to see that. You’ll see that marking on there: 316. You can see it on the nut. It’s going to be hard for you to see it on the camera but on the nut it’s marked as 316. These parts are all 316 stainless. 316 stainless is typically non-magnetic, however, there is a challenge and we’ll talk about that in a minute. This is aluminum and this is 304, 18-8 stainless and these also have the markings for that. So I get calls all the time from customers questioning: “why is this is this stainless magnetic or partially magnetic”? So the answer is that some parts in 316, if you were to buy 316 unformed, untooled, in a stock piece of stainless, it would be non-magnetic. However when you take a hex cap screw or a tap bolt like this that’s been put into a cold form machine to work the stainless you’re then changing the crystal makeup of the stainless steel and that’s what makes it magnetic. So this hex cap screw is magnetic. It’s 316 stainless, you would think that it would be non-magnetic but the fact is it is magnetic, it doesn’t matter if it’s made here in the USA, it doesn’t matter if it’s made in Taiwan, or it’s made in India, if it fits the makeup of stainless and then you cold form it, that’s what makes it magnetic. You’re changing the crystal structure of the actual stainless itself and I’m going to demonstrate that to you right now. I have a magnet here I’m going to show you that this is magnetic. Now I’m going to show you a nut, which is stainless 316. A nut is not worked, it’s just cut. The sides are cut. Okay, then after it’s cut a tap goes in and threads the inside. So there’s no twisting, turning, hammering, banging of the stainless so the crystals in a stainless steel nut are not changed in anyway or form. So this will end up being non-magnetic. It will not pick up the magnet at all. Put the magnet on top, it just falls off. This is a dowel pin in 316 stainless. This is just a plain piece of stock, 5/16 inch diameter dowel pin, and all they do is cut it. Then they just chamfer the edges so there’s no bending or twisting of this and you will see its non-magnetic. Not holding. Same thing with this nut, another 316 stainless nut, different size; still non-magnetic. This is a lock washer and this lock washer has been worked. It’s just a piece of straight stock and it’s been twisted around a jig to create the size of the lock washer and then it’s bent. So this will prove out to be magnetic. That’s all the 316 stainless. 304, 18-8, is partially magnetic. Period. Typically it is partially magnetic. There’s a lot of false information out there that all stainless steel is non-magnetic. Totally untrue. Really the only one that’s non-magnetic, other than some special stainless, is this 316 stainless and that’s the stainless you use in salt water applications and that’s the one that you won’t find surface corrosion or deep corrosion. So I’m going to demonstrate now for you this nut and let’s see if we get any partial-if it picks up the magnet. You will see its partially magnetic; it doesn’t hold it very strong. It’s not as strong as with the 316; it’s like very strong. With this it’s like partially magnetic. So it’s like I have to hold it there a second and then pick it up. You’ll see it’ll just drop off. So that’s what they call partially magnetic. This hex cap screw has been put through a cold form process to make the head. That’s what changed the crystal makeup of this hex cap screw thus making it magnetic. This is a rivet, stainless steel-304 stainless. This whole rivet is worked and the whole crystallization of stainless has been changed; the whole structure. So I’m going to demonstrate for you that this will show up as being highly magnetic. There it is. That’s the Hat part and this is the mandrel. All magnetic. I’m throwing in here a piece of aluminum. This is an aluminum rivet. An aluminum rivet is obviously a metal that is not magnetic and it will not pick up at all. So if you really want total non-magnetic there’s aluminum and that’s basically my demonstration of showing you that stainless steel, depending upon how it’s been treated, how it becomes magnetic. There you go. Subscribe, like, comment. Visit us at albanycountyfasteners.com For 50,000 SKUs right off the rack, ready to ship. We look forward to seeing you in our next video.

12 thoughts on “Is Stainless Steel Magnetic? | Fasteners 101

  1. http://www.engineeringtoolbox.com/identification-stainless-steel-d_383.html this show that stainless 410 and up is magnetic

  2. really poor demo….you failed to point out that there is a base S/s to which other elements can be added to change their structure and magnetic quailties….however you did at least address that S/s can be MADE magnetic ot non

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