Hello everyone,
I've been looking for a board with the minimum thicknesses to make a thread (from M2 to M20 for example) in a sheet metal (from 1mm to 15mm for example).
Thank you and have a good day!
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I don't know if there is a table, because it will depend on the material, the step, the forces transmitted,... !
For my part, in steel I take the height of the Hm nuts as a reference.
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Hello
The rule in general, it is at least 1 time the diameter of the screw (for M12 - 12mm thick sheet)
Then, this thickness can be slightly reduced, everything will depend on the function of your assembly.
For example, for a lid attachment on a container, and there is no pressure, you can put a 10mm sheet metal.
But on the contrary, if the assembly function has to withstand a tension (such as pressurization, load to be suspended).... there it is better to count on 1.5 times the diameter.. so ep.18 in this case.
Afterwards, if you really want a "technical" support, you have to turn to the "omaro"
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See this link
http://metaluver.wifeo.com/documents/Le-taraudage.pdf
Tap depth
The screw pulls on the threads. Tightening too hard can cause it to break (screws or messed up tapping). A tapping depth that allows the installation of a screw is recommended:
- 1.5 times the nominal diameter in hard metals (steel); the AFNOR standard is from 0.5D to 1D
- of 2 times the nominal diameter in soft metals (aluminum or copper alloy).
Standard nuts are about one times the nominal diameter thick. This is because the materials are strong enough.
Typical Tapping Torque Values as a Function of the Thread to Be Tapped.
Metric to ThreadRide Range
M 2.5 - 3 =50 - 95 Ncm
M 3 - 4 =100 - 230 Ncm
M 4 - 6 =240 - 440 Ncm
M 6 - 10 =450 - 700 Ncm
M 10 - 12 =710 - 1300 Ncm
Here you go
@+ ;-)
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There is also this site that allows you to calculate the minimum thickness:
http://www.technocalcul.com/FR/calcul-profondeur-implantation-vis.html
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I have to support 40kg with 4 M8 screws, in 2 square tubes of thickness 5.
Thank you for your answers;)
If your tube is simply S235, 4xM6 will be enough for you!
Edit: With quality screws of course (mini 8.8).
It's 304L
Personally I would say that it works (to see the conditions of use of course). To make sure, use inserts!
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Uh, for me, at least in steel it's ep=1.5 x Ø and in aluminum it's ep= 2 x Ø
If you want less thickness you have to put an end
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304 l is quite flexible so mini size of the diameter the diameter 8 should be enough for the load
If you wanted to keep the skin to tap it it seems short so insert preferably
@+ ;-)
Hello
Attached is a fairly simple table.
40 kg is nothing at all.
On the other hand, a simple and cheap thing to do if you have the space, is to put in addition to the thread in the tube, a washer and a nut. This will stiffen the whole thing and avoid loosening over time in case of vibration.
S.B
vis.gif
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40 kg on thickness 5, you can put M5 and it will still pass by a wide margin ...
The risk with screws that are too big in relation to the thickness is that you risk deteriorating the thread just by tightening!
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See these links in addition
http://www.lyc-vaucanson-lesmureaux.ac-versailles.fr/spip/IMG/pdf/Cours_-_La_liaison_complete_demontable_par_elements_filetes.pdf
http://joho.p.free.fr/EC/COURS%20DOC/Vis/LONGUEUR%20DES%20TARAUDAGES%20ET%20GOUJONS.pdf
@+ ;-)
Hello
Follow this link, and fill in the different characteristics, it will give you what you want.
Hoping to have helped you.
Kind regards.
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As for the rule of 1.5D in steel and 2D in aluminum, it applies to blind tapped holes. As the screw does not go all the way to the end of the tap, it is necessary to provide an extra length of the tap, so we end up with an average of 1D in the steel and 1.5D in the aluminum of the screws engaged in the tapping.
If we remove the end of the screw, chamfered, we find ourselves at 0.8D in real grip (i.e. the height of a Hu nut).
In the case of @Batch123!, 4 screws for 40kg in 5mm thick, I'll go for M6: more threads in grip than M8 and less risk of messing up the thread than M5, especially if it's tightened by a guy with a grip.
Afterwards, to get everyone to agree, I can provide TIG welding equipment... You never know... I put it like that... ;-)
.
In our company we use deformation threads.
Our design rule for these threads is 4 times the pitch to have enough material around the hole.
Hello
I don't know if this will help you, but I work almost with stainless steel in my company, I will do it just in case if you only have 4 screws, either you put M8 or M10, and I to fix them in on the square tube I will tap and weld threaded rods so that you just have to put nuts if that is possible in your configuration, I hope I have been understandable.
A+
if you don't want to be emm... er with the standards
Look at this link stainless steel cage nut to crimp blindly
http://www.interinox.fr/commerce/download/Catalogue_Visserie.pdf
and you explain to them your problem of the part to support
so that it guarantees you the bar stitch attachment
The money problem:
Come in
- Drilling and tapping
- Drilling and installing an insert for time
+ Fast and guaranteed insert installation
@+ ;-)