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#1
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degrees of screw stainless steel
In yet another visit to the market place to get
bolts I read the text on the M4x10 socket screw bag and they come in stainless steel A4, or S/S electro-galvanized galvanized zink plated Electro-galvanized, is that a method to get it galvanized or is it indicative of better protection? Zink plated I suppose is the worst - is it the equivalent of applying zink spray after removing rust from an automobile body? Also these screws come in small packs - the smallest only ten pieces a bag! And even the S/Ss aren't that expensive. So why would anyone settle for worse? Or are there advantages with the galvanized and/or zink plated stuff in certain conditions? /the hairdresser -- underground experts united http://user.it.uu.se/~embe8573 |
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#2
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degrees of screw stainless steel
On 6/9/2017 5:27 PM, Emanuel Berg wrote:
In yet another visit to the market place to get bolts I read the text on the M4x10 socket screw bag and they come in stainless steel A4, or S/S electro-galvanized galvanized zink plated Electro-galvanized, is that a method to get it galvanized or is it indicative of better protection? Zink plated I suppose is the worst - is it the equivalent of applying zink spray after removing rust from an automobile body? Also these screws come in small packs - the smallest only ten pieces a bag! And even the S/Ss aren't that expensive. So why would anyone settle for worse? Or are there advantages with the galvanized and/or zink plated stuff in certain conditions? /the hairdresser where are you buying these things exactly? (what country?) I don't recall ever seeing zinc-plated stainless bolts, tho I suppose I haven't seen everything. For non-marine uses--stainless tends to gall easily so the purpose of a coating is usually just to prevent the threads from getting sticky with repeated insertion/removal. In the US, normal stainless bolts are mostly 304 and extra-corrosion-resistant (marine-grade) ones are 316: https://en.wikipedia.org/wiki/Stainless_steel Chrome-plated bolts look a bit nicer than the plain-stainless (no finish), if you wanted silver shiny bolts. coatings are plain, oxide or chrome. mcmaster (USA) also shows silver-plated ones, but they're rather expensive and I've never seen them used for anything IRL. |
#3
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degrees of screw stainless steel
DougC wrote:
where are you buying these things exactly? (what country?) Sweden. The shop is "Clas Ohlson" which also has shops in Dubai, Finland, Germany, Norway and the UK. The range varies, I suppose. The best thing about the shop here is that it is located in the very city center. All other shops (Biltema, Bauhaus, etc.) are in the industrial areas. It is very close by car and even by bike but I still don't like to go there, it feels half the day is spent doing it, and a lot of blue-collar people do it *every day*, sometimes I think as an excuse not to do actual work. I don't recall ever seeing zinc-plated stainless bolts It just says zinc plated if that matters. The galvanized doesn't say stainless either, just either galvanized or electro-galvanized. The stainless says "Stainless steel A4" and "S/S". -- underground experts united http://user.it.uu.se/~embe8573 |
#4
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degrees of screw stainless steel
On 6/9/2017 6:02 PM, DougC wrote:
On 6/9/2017 5:27 PM, Emanuel Berg wrote: In yet another visit to the market place to get bolts I read the text on the M4x10 socket screw bag and they come in stainless steel A4, or S/S electro-galvanized galvanized zink plated Electro-galvanized, is that a method to get it galvanized or is it indicative of better protection? Zink plated I suppose is the worst - is it the equivalent of applying zink spray after removing rust from an automobile body? Also these screws come in small packs - the smallest only ten pieces a bag! And even the S/Ss aren't that expensive. So why would anyone settle for worse? Or are there advantages with the galvanized and/or zink plated stuff in certain conditions? /the hairdresser where are you buying these things exactly? (what country?) I don't recall ever seeing zinc-plated stainless bolts, tho I suppose I haven't seen everything. For non-marine uses--stainless tends to gall easily so the purpose of a coating is usually just to prevent the threads from getting sticky with repeated insertion/removal. In the US, normal stainless bolts are mostly 304 and extra-corrosion-resistant (marine-grade) ones are 316: https://en.wikipedia.org/wiki/Stainless_steel Chrome-plated bolts look a bit nicer than the plain-stainless (no finish), if you wanted silver shiny bolts. coatings are plain, oxide or chrome. mcmaster (USA) also shows silver-plated ones, but they're rather expensive and I've never seen them used for anything IRL. Used to see silver plate for electrical connector screws but I haven't seen one in many years. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#5
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degrees of screw stainless steel
The socket screws are
DIN 912 / ISO 4762 Socket Cap Screw A2/A4 Stainless Steel and the washers are DIN 125 / ISO 7089, 7090 Flat Washer A2/A4 Stainless It says they are A4 on the bags. http://fullerfasteners.com/products/...rew-stainless/ http://fullerfasteners.com/products/...her-stainless/ -- underground experts united http://user.it.uu.se/~embe8573 |
#6
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degrees of screw stainless steel
Silver tarnishes ?
For bicycle use go with grade 5 5 is hard strong steel somewhat rust resistant.. Coat with thinned linseed Hardware store SS maybe grade 2.5. Go to the industrial era. |
#7
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degrees of screw stainless steel
Emanuel Berg wrote:
The socket screws are DIN 912 / ISO 4762 Socket Cap Screw A2/A4Â*Stainless Steel and the washers are DIN 125 / ISO 7089, 7090 Flat Washer A2/A4Â*Stainless I have a German Heyco double ended spanner (10 and 13 mm) which is DIN 895. Wow, what does it all mean? Some German system of standardization... -- underground experts united http://user.it.uu.se/~embe8573 |
#8
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degrees of screw stainless steel
Go to the industrial era.
Ha! Of course, it is unavoidable sometimes. Some stuff isn't available elsewhere. It is not so industrial anymore BTW. De-industrialized rather. But many of the hardware stores are located there and their profits seem not that bothered by the decay... -- underground experts united http://user.it.uu.se/~embe8573 |
#9
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degrees of screw stainless steel
On Fri, 9 Jun 2017 18:02:30 -0500, DougC
wrote: In the US, normal stainless bolts are mostly 304 and extra-corrosion-resistant (marine-grade) ones are 316: https://en.wikipedia.org/wiki/Stainless_steel A little more on stainless: A2 is the same as 304. A4 is the same as 316 and contains molybdenum and more nickel and nitrogen making it stronger and more resistant to corrosion. You can easily tell the difference. A2 is slightly magnetic, while A4 is non-magnetic: https://www.youtube.com/watch?v=mbbXvvpoLCo Stainless fasteners are normally NOT coated because stainless is protected by a thin chromium oxide layer that forms on the surface. If this is for your bicycle, either stainless type will work. I would not recommend hot dip galvanized (ugly and too thick), electroplated zinc (too thin and rusts where scratched), or chrome plating (looks good until it rusts) fasteners. I'm undecided on bright chrome plating, which seems to survive fairly well. However, at the small differential in cost, stainless is still the best. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#10
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degrees of screw stainless steel
On Sat, 10 Jun 2017 00:27:56 +0200, Emanuel Berg
wrote: In yet another visit to the market place to get bolts I read the text on the M4x10 socket screw bag and they come in stainless steel A4, or S/S electro-galvanized galvanized zink plated Electro-galvanized, is that a method to get it galvanized or is it indicative of better protection? Zink plated I suppose is the worst - is it the equivalent of applying zink spray after removing rust from an automobile body? Also these screws come in small packs - the smallest only ten pieces a bag! And even the S/Ss aren't that expensive. So why would anyone settle for worse? Or are there advantages with the galvanized and/or zink plated stuff in certain conditions? /the hairdresser Galvanizing is the coating of steel (usually) with zinc. Two common methods are by "hot dip", immersing the object in a vat of molten zinc, and plating which is an electrical-chemical method of depositing zinc onto a part. Generally speaking, hot-dip results in the thickest coating. My own solution is to use only stainless bolts in the smaller sizes, say up to 6mm... -- Cheers, John B. |
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