[Dsg-rich] Structure Torque Specs

[Amrit Yegneswaran]

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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