[Dsg-rich] Structure Torque Specs

[Tomassini Sandro]

Dear All,
Today I had a day off but I have seen tens of emails of every type and 
so I am trying to give some answer:

Tightenig torque:

considering a friction of 0.3, assuming bolts type A2/70 made of 
stainless steel, than you can refer to the following table (red circle):
e.g.: for a M8 the tightening torque is 25.5 N*m= 19 FT-LBF.

Regards
Sandro




Il 27/02/2017 21:36, Amrit Yegneswaran ha scritto:
> brian,
> the notation does mean, as you say, no greater than 20 Nm, because of 
> the concern of stripping the threads.
> obviously, one wouldn't want to set the torque way lower (like 0 Nm!!) 
> or way higher
> some US manufacturers have suggested for M8x10 as low a 18.7 Nm to as 
> high as 37 Nm? (i guess, nor sure)
> but the torque does depend on many factors, type of metal, finish, and 
> lube!!!
>
> i'm sure sandro and dario can tell us the exact number.
> amrit
>
>
>
> ------------------------------------------------------------------------
> *From: *"Brian Eng" <beng at jlab.org>
> *To: *"dsg-rich" <dsg-rich at jlab.org>
> *Sent: *Monday, February 27, 2017 1:26:36 PM
> *Subject: *[Dsg-rich] Structure Torque Specs
>
> Since there don't seem to be any torque numbers on the drawings, I 
> think I found the part from the manufacturer.
>
> http://www.bettsistemi.com/structural-profiles-and-accessories-p33/coupling-parts-sf241/nuts-and-bolts-f817/connection-plate-861-pr1983.html
>
> Unfortunately I don't quite understand their notation. Since we're 
> using the M8 screws, does it mean we use less than 20 Nm (which is 
> basically anything) or does that mean at least 20 Nm, in which case, 
> what's the max?
>
> Should we just set a torque wrench for 15 ftlbf (since 20 Nm = 14.75 
> ftlbf [but good luck setting that])?
>
> --
> Brian Eng
> Detector Support Group
> 757-269-6018
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>
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-- 
-----------------------------------------
Dr. Eng. Sandro Tomassini
Istituto Nazionale di Fisica Nucleare
Laboratori Nazionali di Frascati
---Research Division---
P.O.Box 13 00044 Frascati (RM) Italy
Tel. office: +39 06 9403 2919/8089
Fax: +39 06 94032256
e-mail: sandro.tomassini at lnf.infn.it
http://www.lnf.infn.it/
-----------------------------------------
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