[DeTomaso] Rear Suspension Lower Support Shaft Torque - 95 ft. lbs. !?

[Pantdino]

 Nut / bolt torque specs can be a little bit complicated 
the link is to the specs for a DRY regular nut. I suspect that bolt is an M12, but it could be a 10 or 14.
if you use anti-seize or there is oil on the threads you should subtract  20-25% from the numbers   
for a Nylox nut you should measure the torque required to move the nut on the threads when the nylon has engaged but before it contacts anything and add that to the number
That bolt is in shear rather than tension, that is the force applied to it is perpendicular to it rather than trying to pull it apart lengthwise, and it has Nylox nuts on it so the accuracy of the torque setting is probably less critical. 
The problem here is that we don't know the grade of that bolt unless your supplier can tell you. It's probably safe to say it's at least a 10.9 from the factory but it's better to know for sure
Personally I wouldn't apply 95 ft-lbs unless your supplier assures you it is a 12.9 bolt and 95 is the correct amount. 85 sounds better to me. https://www.sbmar.com/articles/metric-bolt-torque-specifications/


Jim


    On Sunday, June 23, 2024 at 07:41:50 PM PDT, Larry Stock <larrys at panteraparts.com> wrote:   

 I'm shooting from my hip on a Sunday night but 65 foot pounds sounds pretty tight for that size nut
Larry

On 6/22/24, 4:19 PM, "DeTomaso on behalf of Mike & Elizabeth" <detomaso-bounces at server.detomasolist.com <mailto:detomaso-bounces at server.detomasolist.com> on behalf of mbefthomas2 at gmail.com <mailto:mbefthomas2 at gmail.com>> wrote:


Assembling my rear suspension and when I checked the assembly
instructions in the technical manuals for the lower support shaft it
indicated 95 ft. lbs. for the bolts at either end of the shaft.




I have one of Byars greaseable support shaft assemblies, very similar
to what Larry Stock sells, and I don't recall if the torque specs for
that are any different. 95 ft. lbs. seems like a lot of twist.




Larry, et al, what say you?




Thanks


Mike Thomas
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-------------- next part --------------
   Nut / bolt torque specs can be a little bit complicated
   the link is to the specs for a DRY regular nut. I suspect that bolt is
   an M12, but it could be a 10 or 14.
   if you use anti-seize or there is oil on the threads you should
   subtract  20-25% from the numbers
   for a Nylox nut you should measure the torque required to move the nut
   on the threads when the nylon has engaged but before it contacts
   anything and add that to the number
   That bolt is in shear rather than tension, that is the force applied to
   it is perpendicular to it rather than trying to pull it apart
   lengthwise, and it has Nylox nuts on it so the accuracy of the torque
   setting is probably less critical.
   The problem here is that we don't know the grade of that bolt unless
   your supplier can tell you. It's probably safe to say it's at least a
   10.9 from the factory but it's better to know for sure
   Personally I wouldn't apply 95 ft-lbs unless your supplier assures you
   it is a 12.9 bolt and 95 is the correct amount. 85 sounds better to
   me.
   [1]https://www.sbmar.com/articles/metric-bolt-torque-specifications/
   Jim

   On Sunday, June 23, 2024 at 07:41:50 PM PDT, Larry Stock
   <larrys at panteraparts.com> wrote:
   I'm shooting from my hip on a Sunday night but 65 foot pounds sounds
   pretty tight for that size nut
   Larry
   i>>?On 6/22/24, 4:19 PM, "DeTomaso on behalf of Mike & Elizabeth"
   <[2]detomaso-bounces at server.detomasolist.com
   <mailto:detomaso-bounces at server.detomasolist.com> on behalf of
   [3]mbefthomas2 at gmail.com <mailto:mbefthomas2 at gmail.com>> wrote:
   Assembling my rear suspension and when I checked the assembly
   instructions in the technical manuals for the lower support shaft it
   indicated 95 ft. lbs. for the bolts at either end of the shaft.
   I have one of Byars greaseable support shaft assemblies, very similar
   to what Larry Stock sells, and I don't recall if the torque specs for
   that are any different. 95 ft. lbs. seems like a lot of twist.
   Larry, et al, what say you?
   Thanks
   Mike Thomas
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
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References

   1. https://www.sbmar.com/articles/metric-bolt-torque-specifications/
   2. mailto:detomaso-bounces at server.detomasolist.com
   3. mailto:mbefthomas2 at gmail.com
   4. mailto:DeTomaso at server.detomasolist.com
   5. http://server.detomasolist.com/mailman/listinfo/detomaso
   6. http://server.detomasolist.com/mailman/listinfo/detomaso
   7. mailto:DeTomaso at server.detomasolist.com
   8. http://server.detomasolist.com/mailman/listinfo/detomaso