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<div class="moz-cite-prefix">Dear All,<br>
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:<br>
<br>
Tightenig torque:<br>
<br>
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):<br>
e.g.: for a M8 the tightening torque is 25.5 N*m= 19 FT-LBF.<br>
<br>
Regards<br>
Sandro<br>
<br>
<img src="cid:part1.B4871146.4C864AF1@lnf.infn.it" alt=""><br>
<br>
<br>
Il 27/02/2017 21:36, Amrit Yegneswaran ha scritto:<br>
</div>
<blockquote
cite="mid:424578194.747149.1488227778903.JavaMail.zimbra@jlab.org"
type="cite">
<div style="font-family: tahoma,new york,times,serif; font-size:
14pt; color: #009900">
<div>brian,<br>
</div>
<div>the notation does mean, as you say, no greater than 20 Nm,
because of the concern of stripping the threads.<br
data-mce-bogus="1">
</div>
<div>obviously, one wouldn't want to set the torque way lower
(like 0 Nm!!) or way higher <br data-mce-bogus="1">
</div>
<div>some US manufacturers have suggested for M8x10 as low a
18.7 Nm to as high as 37 Nm? (i guess, nor sure)<br
data-mce-bogus="1">
</div>
<div>but the torque does depend on many factors, type of metal,
finish, and lube!!!<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>i'm sure sandro and dario can tell us the exact number.<br
data-mce-bogus="1">
</div>
<div>amrit<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div><br>
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"Brian Eng"
<a class="moz-txt-link-rfc2396E" href="mailto:beng@jlab.org"><beng@jlab.org></a><br>
<b>To: </b>"dsg-rich" <a class="moz-txt-link-rfc2396E" href="mailto:dsg-rich@jlab.org"><dsg-rich@jlab.org></a><br>
<b>Sent: </b>Monday, February 27, 2017 1:26:36 PM<br>
<b>Subject: </b>[Dsg-rich] Structure Torque Specs<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">Since there don't seem to be
any torque numbers on the drawings, I think I found the part
from the manufacturer.<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.bettsistemi.com/structural-profiles-and-accessories-p33/coupling-parts-sf241/nuts-and-bolts-f817/connection-plate-861-pr1983.html">http://www.bettsistemi.com/structural-profiles-and-accessories-p33/coupling-parts-sf241/nuts-and-bolts-f817/connection-plate-861-pr1983.html</a><br>
<br>
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?<br>
<br>
Should we just set a torque wrench for 15 ftlbf (since 20 Nm =
14.75 ftlbf [but good luck setting that])?<br>
<br>
--<br>
Brian Eng<br>
Detector Support Group<br>
757-269-6018<br>
_______________________________________________<br>
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</div>
</div>
<br>
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</blockquote>
<br>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
-----------------------------------------
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: <a class="moz-txt-link-abbreviated" href="mailto:sandro.tomassini@lnf.infn.it">sandro.tomassini@lnf.infn.it</a>
<a class="moz-txt-link-freetext" href="http://www.lnf.infn.it/">http://www.lnf.infn.it/</a>
-----------------------------------------
-- </pre>
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