SWL threaded rod

[Bango87]

Hi all a question regarding the safe work load of threaded rods. Planning on installing threaded rod for hanging cable tray and light fittings off the cable tray. I was needing to know the safe work load of 6mm threaded rod = ??
8mm threaded rod =??
10mm threaded rod= ??
12mm threaded rod = ??


Length of rod installed will be 1 meter Long fixed to cable tray. Replies will be much appreciated.

Kind regards

 

[racookpe1978]

How well do you trust the fabricator of the threaded rod?
(Is it Chinese made of questionable actual metallurgy and temperment? Or of good quality and reliably and uniformly made to the steel spec's it is claimed to be made of?)

If you trust the metal and the dimensions, the values are on line for each alloy for each standard diameter.

 

[racookpe1978]

For cable trays, look at the anchor tables for the threaded rod embeds, also the cable tray support tables. Pipe support tables usually have threaded rod working limits too.

 

[kingnero]

Rods have rolled threads, so the effective cross section is smaller than the nominal value. If you're not sure, use the minor diameter.

Just another thing: make sure your connections to whatever it is that is holding the rods in the air, can take the load as well.

http://www.fusionpoint.be

http://be.linkedin.com/in/fusionpoint

 

[RolMec]

If you're in metric land, then you need to get to following:
a) quality (mech. property) of the material, e.g. 4.6 or 8.8 or other --> defines yield strength
b) precisely define the loading of your application (oblique loading?)
c) the core cross sections of resp. metric threads are
M8 = 36.6 mm² M10 = 58 mm² M12 = 84.3 mm²
d) define the appropriate safety factor for your industry, which will then get you to a permitted tension as per specific rod material and size --> imo there's no generalized SWL to cover all & every application. I'd at least consider 1.5 for an unknown application.

To get to a reputable supplier (even right now, for consultation) shall
1) give you the security that the rods shall bear the load you intend them to bear (materials as per spec. threads executed as per standard, specific input as to loadbearing capac. ~ your application)
2) give you all the specific input (& expertise of those people) you need & i couldn't bring forward due to the generalizing as per abovewritten

Regards

Roland Heilmann, Leipzig, FRG