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Posted: 4/15/2024 10:13:16 PM EDT
Needed nuts and bolts to replace a couple for mounting my motor to my boat. Went to Lowe's grabbed a couple, paid for them, and when I got home I didn't have time right away to install them. So I put them in a magnetic parts dish. They slid around the dish freely. Struck me as odd so I lifted them out....zero resistance. The magnet wasn't doing anything to hold the bolts. Figured maybe something was wrong with the dish so I tried a different one. Same result.
Any idea why stainless bolts wouldn't be magnetic? Never encountered such a thing before. Thanks! |
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Posted: 4/15/2024 10:15:21 PM EDT
[#1]
That's normal. Depending on grade, stainless steel ranges from "a little magnetic" to "not magnetic at all".
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GA, USA
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Posted: 4/15/2024 10:15:22 PM EDT
[#2]
Chinese stainless.
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NC, USA
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Posted: 4/15/2024 10:16:00 PM EDT
[#3]
Iron rusts, so no.
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Posted: 4/15/2024 10:16:49 PM EDT
[#4]
Stainless generally isn't magnetic.
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Posted: 4/15/2024 10:17:07 PM EDT
[#5]
Quote HistoryOriginally Posted By noob5000000: That's normal. Depending on grade, stainless steel ranges from "a little magnetic" to "not magnetic at all". You serious Clark? What grade is not magnetic at all? Typically stainless bolts are glued to magnetic parts dishes. |
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Posted: 4/15/2024 10:17:53 PM EDT
[Last Edit: RIP-Yataski]
[#6]
Many stainless steels are non-ferrous. Figured this was common knowledge...
ETA: I was corrected further down the thread regarding using 'non-ferrous' in this case. We aren't talking aluminum or copper here... |
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Posted: 4/15/2024 10:17:54 PM EDT
[#7]
18-8 stainless hardware is non magnetic.
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Posted: 4/15/2024 10:19:11 PM EDT
[#8]
Yes and no. Different types of stainless have different levels of magnetic attraction.
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MO, USA
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Posted: 4/15/2024 10:19:28 PM EDT
[#9]
As previously stated stainless in general is only slightly magnetic.
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Posted: 4/15/2024 10:20:28 PM EDT
[Last Edit: MethaneMover]
[#10]
Quote HistoryOriginally Posted By Emt1581: You serious Clark? What grade is not magnetic at all? Typically stainless bolts are glued to magnetic parts dishes. |
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Posted: 4/15/2024 10:21:00 PM EDT
[#11]
Non-magnetic stainless steel has a high nickel content, which causes it to be non-magnetic.
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Posted: 4/15/2024 10:22:52 PM EDT
[#12]
Quote HistoryOriginally Posted By curiomatic: Non-magnetic stainless steel has a high nickel content, which causes it to be non-magnetic. |
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Posted: 4/15/2024 10:26:06 PM EDT
[#13]
Quote HistoryOriginally Posted By RIP-Yataski: Many stainless steels are non-ferrous. Figured this was common knowledge... |
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Posted: 4/15/2024 10:28:21 PM EDT
[#14]
I like stainless fridge doors for that reason.
No crappy magnets with notes will stick to it. And my fridge is in a cubby hole so the sides aren't accessible. I too thought it was common knowledge of the characteristics of stainless steel. |
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Posted: 4/15/2024 10:40:09 PM EDT
[#15]
Quote HistoryOriginally Posted By curiomatic: Non-magnetic stainless steel has a high nickel content, which causes it to be non-magnetic. Kinda weird since pure nickel is magnetic. |
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Posted: 4/15/2024 10:42:11 PM EDT
[Last Edit: MeestaSparkle]
[#16]
Martensitic stainless alloys are magnetic, austenitic are not. It has to do with the crystal structure. If you want a magnetic SS it has to be a martensitic alloy. Nickel is actually magnetic, so some of the previous comments aren’t totally accurate. All stainless alloys are ferritic (containing iron), the more important property regarding magnetism is crystal struture.
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TX, USA
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Posted: 4/15/2024 10:48:04 PM EDT
[#17]
Quote HistoryOriginally Posted By Emt1581: You serious Clark? What grade is not magnetic at all? Typically stainless bolts are glued to magnetic parts dishes. you must be confusing stainless non ferrous with galvanized |
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Posted: 4/15/2024 10:48:51 PM EDT
[#18]
Quote HistoryOriginally Posted By MeestaSparkle: Martensitic stainless alloys are magnetic, austenitic are not. It has to do with the crystal structure. If you want a magnetic SS it has to be a martensitic alloy. Nickel is actually magnetic, so some of the previous comments aren’t totally accurate. I use a lot of Aebl stainless which is martensitic. In an annealed state it is very magnetic, once it is hardened it becomes much less magnetic. I often have to use super glue to help keep small part on the magnetic chuck for surface grinding. It's really weird what alloying creates sometimes. |
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TX, USA
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Posted: 4/15/2024 10:49:19 PM EDT
[#19]
Technically SS is paramagnetic, according to it's alloy.
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Posted: 4/15/2024 10:50:00 PM EDT
[#20]
300 series is not normally magnetic, but can get that way by cold working. 400 series is normally magnetic. Still, not very strongly magnetic. |
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Posted: 4/15/2024 10:50:02 PM EDT
[#21]
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NM, USA
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Posted: 4/15/2024 10:50:59 PM EDT
[#22]
Quote HistoryOriginally Posted By RIP-Yataski: Many stainless steels are non-ferrous. Figured this was common knowledge... I would have been more surprised if a "stainless bolt" was magnetic. Not sure about the level of magnetism, I'm sure there's science that I've forgotten about it, but in general, this. |
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AZ, USA
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Posted: 4/15/2024 10:52:16 PM EDT
[#23]
Quote HistoryOriginally Posted By MeestaSparkle: Martensitic stainless alloys are magnetic, austenitic are not. It has to do with the crystal structure. If you want a magnetic SS it has to be a martensitic alloy. Nickel is actually magnetic, so some of the previous comments aren’t totally accurate. All stainless alloys are ferritic (containing iron), the more important property regarding magnetism is crystal struture. ^^^ that's the answer. Also about 70% of SS production is austenitic, so odds are really good you'll get it and not something else. |
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Posted: 4/15/2024 10:55:11 PM EDT
[#24]
Quote HistoryOriginally Posted By HangfiresGhost: Chinese stainless. Any austenitic / 3xx stainless steels non magnetic ferritic / 4xx type stainless steels are magnetic |
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Posted: 4/15/2024 10:57:16 PM EDT
[#25]
Quote HistoryOriginally Posted By curiomatic: Non-magnetic stainless steel has a high nickel content, which causes it to be non-magnetic. Which is odd because iron, nickel & cobalt are all ferrous metals... |
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Posted: 4/15/2024 10:59:23 PM EDT
[Last Edit: JQ66]
[#26]
Quote HistoryOriginally Posted By RIP-Yataski: Many stainless steels are non-ferrous. Figured this was common knowledge... You have iron-nickel stainless alloys, with chrome too, as well as other stuff in there. They are usually mostly iron,with chrome then nickel being no2 and 3 in %. These are generally your austenitic 3xx grades Then there is the Iron-chrome which is mostly ferritics. This would be like 439 stainless. Non ferrous is no Fe, so could be nickel alloys, cobalt, Al, titanium... Well they're going to have some Fe, but Any iron would be very small % Not all 400 type stainless steels are martensitic. Some are ferritic, like 409, 430, 441. And then there's duplex alloys This wiki article is pretty good and covers all the stainless types and properties https://en.wikipedia.org/wiki/Stainless_steel |
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Posted: 4/15/2024 10:59:25 PM EDT
[#27]
Quote HistoryOriginally Posted By RIP-Yataski: Many stainless steels are non-ferrous. Figured this was common knowledge... You forgot where you are. |
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TX, USA
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Posted: 4/15/2024 11:00:12 PM EDT
[#28]
Some stainless steel is a little magnetic, some is not.
Stainless is a blend of metals and sometimes some carbon, not much carbon. One of my dive knives does not rust but doesn't take a good edge. Another dive knife holds a good edge but can rust a bit. This one probably has some carbon to make it take a good edge. |
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TX, USA
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Posted: 4/15/2024 11:01:43 PM EDT
[#29]
Quote HistoryOriginally Posted By MeestaSparkle: Martensitic stainless alloys are magnetic, austenitic are not. It has to do with the crystal structure. If you want a magnetic SS it has to be a martensitic alloy. Nickel is actually magnetic, so some of the previous comments aren’t totally accurate. All stainless alloys are ferritic (containing iron), the more important property regarding magnetism is crystal struture. Thank you. |
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AZ, USA
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Posted: 4/15/2024 11:05:58 PM EDT
[#30]
Quote HistoryOriginally Posted By RIP-Yataski: Many stainless steels are non-ferrous. Figured this was common knowledge... Ferromagnetic. Non-ferrous means no iron content. |
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MI, USA
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Posted: 4/15/2024 11:07:19 PM EDT
[#31]
Quote HistoryOriginally Posted By RIP-Yataski: Many stainless steels are non-ferrous. Figured this was common knowledge... This isn't true. Ferrous means iron. Steel is always an alloy of iron and some other trace materials. Therefore it's not possible to have a non-ferrous type of steel, stainless or otherwise. My best guess is that the multiple people in this thread saying stainless steel is non-ferrous think non-ferrous means non-magnetic, which it doesn't. Sorry, I'm kind of surprised at how much this annoyed me. |
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Posted: 4/15/2024 11:08:49 PM EDT
[#32]
Them dang stainless steel tool boxes and fridges gets everyone confused being magnetic.
Stainless hardware is non magnetic. If you go to your steel supply store, they're going to have 304, 316 on hand and that's non magnetic - very commonly used for manufacturing. Look up "stainless steel hardware galling" before using your nuts and bolts in the case you might want to take your parts apart again someday. |
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GA, USA
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Posted: 4/15/2024 11:11:02 PM EDT
[#33]
Colt Pistol Grip screw, NON magnetic, lock washer is.
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NM, USA
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Posted: 4/15/2024 11:21:07 PM EDT
[#34]
Quote HistoryOriginally Posted By Michigan_Man: This isn't true. Ferrous means iron. Steel is always an alloy of iron and some other trace materials. Therefore it's not possible to have a non-ferrous type of steel, stainless or otherwise. My best guess is that the multiple people in this thread saying stainless steel is non-ferrous think non-ferrous means non-magnetic, which it doesn't. Sorry, I'm kind of surprised at how much this annoyed me. Quote HistoryOriginally Posted By Michigan_Man: Originally Posted By RIP-Yataski: Many stainless steels are non-ferrous. Figured this was common knowledge... This isn't true. Ferrous means iron. Steel is always an alloy of iron and some other trace materials. Therefore it's not possible to have a non-ferrous type of steel, stainless or otherwise. My best guess is that the multiple people in this thread saying stainless steel is non-ferrous think non-ferrous means non-magnetic, which it doesn't. Sorry, I'm kind of surprised at how much this annoyed me. My day job involves me being very pedantic, so I get it. That said, the main thing I know of that uses stainless steel is boating, what else might? I know I stay away from stainless steel hardware on purpose, supposed to be way worse in many respects, and any science classes I didn't sleep through are long ago. Not many are interested in the nitty gritty of my pedantic computer work. Which might explain my own lack of enthusiasm for working on computers at home. |
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TX, USA
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Posted: 4/15/2024 11:23:03 PM EDT
[Last Edit: tsg68]
[#35]
Lol, really? Who didn’t know non ferrous metals aren’t magnetic?
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KY, USA
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Posted: 4/15/2024 11:25:54 PM EDT
[#36]
Higher the corrosion resistance = higher chromium = less magnetic
Some SS is magnetic, some isn’t |
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Posted: 4/15/2024 11:30:07 PM EDT
[#37]
Quote HistoryOriginally Posted By haveTwo: My day job involves me being very pedantic, so I get it. That said, the main thing I know of that uses stainless steel is boating, what else might? I know I stay away from stainless steel hardware on purpose, supposed to be way worse in many respects, and any science classes I didn't sleep through are long ago. Not many are interested in the nitty gritty of my pedantic computer work. Which might explain my own lack of enthusiasm for working on computers at home. |
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Posted: 4/15/2024 11:31:13 PM EDT
[#38]
Quote HistoryOriginally Posted By DamascusKnifemaker: Kinda weird since pure nickel is magnetic. Quote HistoryOriginally Posted By DamascusKnifemaker: Originally Posted By curiomatic: Non-magnetic stainless steel has a high nickel content, which causes it to be non-magnetic. Kinda weird since pure nickel is magnetic. Nickel affects the Crystaline structure of stainless in a way that makes it non-magnetic. There are magnetic alloys of stainless steel. |
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NM, USA
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Posted: 4/15/2024 11:33:04 PM EDT
[#39]
Quote HistoryOriginally Posted By MethaneMover: Anything high temp, low temp, corrosive, sanitary, or needing abrasion resistance....off hand. Quote HistoryOriginally Posted By MethaneMover: Originally Posted By haveTwo: My day job involves me being very pedantic, so I get it. That said, the main thing I know of that uses stainless steel is boating, what else might? I know I stay away from stainless steel hardware on purpose, supposed to be way worse in many respects, and any science classes I didn't sleep through are long ago. Not many are interested in the nitty gritty of my pedantic computer work. Which might explain my own lack of enthusiasm for working on computers at home. Well shit, that's why. I'm pretty much only concerned with "ranchy" fixes, and sketchy vehicle shit. I know to stay away from it with old jap bikes for sure. Otherwise I'm just getting galvanized for general home use. |
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Posted: 4/15/2024 11:35:56 PM EDT
[#40]
I Just cleaned out my garage and went through all of my containers of mixed nuts, bolts screws, and washers. I can confirm that some stainless is truly not magnetic and some is partially.
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Posted: 4/15/2024 11:36:38 PM EDT
[#41]
Quote HistoryOriginally Posted By haveTwo: Well shit, that's why. I'm pretty much only concerned with "ranchy" fixes, and sketchy vehicle shit. I know to stay away from it with old jap bikes for sure. Otherwise I'm just getting galvanized for general home use. |
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Posted: 4/15/2024 11:38:30 PM EDT
[#42]
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Posted: 4/15/2024 11:39:27 PM EDT
[Last Edit: slowkota1]
[#43]
Quote HistoryOriginally Posted By Emt1581: You serious Clark? What grade is not magnetic at all? Typically stainless bolts are glued to magnetic parts dishes. Ummm... lol At a previous job, I worked with lots of Stainless steel that wasn't magnetic. A lil annoying since we mainly used magnetic lifting blocks on our hoists haha |
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Posted: 4/15/2024 11:39:47 PM EDT
[#44]
Originally Posted By jaqufrost: Stainless generally isn't magnetic. |
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USA
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Posted: 4/15/2024 11:43:57 PM EDT
[#45]
Quote HistoryOriginally Posted By Codyboy: I like stainless fridge doors for that reason. No crappy magnets with notes will stick to it. And my fridge is in a cubby hole so the sides aren't accessible. I too thought it was common knowledge of the characteristics of stainless steel. This. My wife loves magnets of all kinds so she can have the fridge covered in shit. I got tired of it and suggested we buy a new stainless fridge. She loved the idea. I took a magnet with me to make sure they wouldn’t stick to it. Came home with the new fridge. She immediately tries to put shit on it and nothing stuck. She was pissed. After a little online research she figured it out but never blamed me. Next house we moved to several years later she made damned sure that it would attract a magnet. |
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Posted: 4/16/2024 12:10:39 AM EDT
[Last Edit: harrymank]
[#46]
Everyday we get one step closer to idiocracy.
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Posted: 4/16/2024 12:22:34 AM EDT
[Last Edit: Obo2]
[#47]
Quote HistoryOriginally Posted By RIP-Yataski: Which is odd because iron, nickel & cobalt are all ferrous metals... Ferrous literally means containing iron. Which would exclude pure nickel and cobalt.. |
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TX, USA
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Posted: 4/16/2024 12:48:32 AM EDT
[#48]
i am always in awe of the knowledge concentrated in this forum.
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Posted: 4/16/2024 9:19:24 AM EDT
[#49]
Quote HistoryOriginally Posted By Emt1581: Typically stainless bolts are glued to magnetic parts dishes. No they aren't. The more stainless, the less magnetic. If they're a crappy quality and have other metals mixed in they become magnetic. |
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Posted: 4/16/2024 9:39:38 AM EDT
[#50]
Originally Posted By Emt1581: Needed nuts and bolts to replace a couple for mounting my motor to my boat. Is your boat made of aluminum? https://crafter.fastenal.com/static-assets/pdfs/Corrosion_rev_2017-02-21.pdf |
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