I think you are correct re the extension since it likely ‘twists’ under the
applied torque wrench torque.
Based on previous list comments about the precision/accuracy of all the factors
that go into the recommended torque values, my guess is that with a reasonably
built extension, the torque ‘wasted’ in it is within the error bars of the
recommended torques for the keel bolts.
Of course the extension must be able to take the torque applied without
deformation or snapping apart so your point is well taken. Much like large
winches, there is substantial stored energy in the system when in use—if
something breaks, bad things could happen!
Thanks for chiming in.
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On Thursday, February 21, 2019, David Miles via CnC-List
<cnc-list@cnc-list.com> wrote:
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I could be wrong, but don’t you also have to allow for the torque/flex of the
extension, therefore if you have a listed 250# value to be measured, you add
the 15# rating of the extension, making your goal readout at a new number of
265#s? I am only guessing at the extension value. Need to check ours as well,
but this thought comes to mind from many years ago. Would like to know if it
has merit or not.
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David via
CnC-List
Sent: February-21-19 3:35 PM
To: cnc-list@cnc-list.com
Cc: David
Subject: Re: Stus-List Bolts, nuts and torque
Renting a large torque wrench is a easy solution...
>From my Android....
From: CnC-List <cnc-list-boun...@cnc-list.com> on behalf of Charlie Nelson via
CnC-List <cnc-list@cnc-list.com>
Sent: Thursday, February 21, 2019 5:46:47 PM
To: cnc-list@cnc-list.com
Cc: cenel...@aol.com
Subject: Re: Stus-List Bolts, nuts and torque
Thanks for chiming in Josh. I like not buying a multiplier!
Will have a look for a 250 ft-lb wrench etc. and review your video.
Good catch on the the stud size—my msmt was with a ruler across the stud but
was likely across the inside of the thread groove—plus 7/8” seems a little
strange for such a large stud. The flats on the nut were much easier to
measure.
I like your ft-lb numbers since they are consistent with what I found for SS
and reachable without a multiplier.
Thanks again,
Charlie
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On Thursday, February 21, 2019, Josh Muckley via CnC-List
<cnc-list@cnc-list.com> wrote:
Look in the description section of the video for useful links.
https://youtu.be/n6B0IPKQERc
If the flats of the nut are at 1-1/2 inch then the studs are 1 inch and you're
looking at roughly 230 to 250 ft-lbs lubricated torque value. A large torque
wrench from Home Depot or Lowes should max out at 250. It will almost
certainly be 1/2 inch drive. Operating any torque wrench at its high limit is
always difficult... But doable. I would probably try to save myself the money
on a torque multiplier and just get the biggest torque wrench and 1/2" drive
extensions and a 1/2 inch drive, deep, 6 point, 1-1/2" socket.
Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
On Thu, Feb 21, 2019, 1:41 PM Charlie Nelson via CnC-List
<cnc-list@cnc-list.com wrote:
It appears per list comments that it is OK to tighten my keel/centerboard
'trunk' without putting her on the hard. Since I can reach most of the nuts by
removing the cabin sole, I figure its worth a try. I cannot reach the bolts
under the mast this way but I can probably get to most of the others. My
keel/cb trunk is pretty wide so there are 2 rows of bolts/nuts holding it to
the hull.
My guess is that I have 8-12 pairs of bolts and those that I can see are 7/8"
diameter with nuts that are 1 1/2" across and appear to be stainless steel.
BTW, my keel/cb trunk and board weigh-in at about 5600 lbs per the original
specs.
A quick internet search on torque wrenches, multipliers and torque values with
my bilge depth in mind indicates that I will need a 1 1/2" socket with an
extension of ~ 12 inches and maybe a torque multiplier, depending on the torque
required.
List sources suggest torques of over 200 ft-lbs are required and most common
torque wrenches top out at 150 ft-lbs thus the multiplier. My quick look at
recommended torques vs. SS (18-8) bolt sizes indicates 193-195 ft-lbs is
recommended for my bolts which is consistent with values I have seen on the
list and the C&C photo album, although a little on the low end.
OTOH, I might be able to use a bigger/longer torque wrench without the
multiplier.
Either way, I am not certain of what drive size to either rent/borrow or
buy--and the cost is substantial if you go from the 'standard' 1/2" drive to
3/4" or higher.
Questions for the list:
1. Are my torque values ~ 200 ft-lbs within the ballpark? I seem to remember
some list recommendations at ~ 350 ft-lbs!
2. Also, what is a reasonable drive size to use?
3. Should I just go with a larger torque wrench (which will reach the ft-lbs
required without the multiplier)?
4. Any likely issues with not tightening the bolts under the mast until my
haul-out this summer?
TIA
Charlie Nelson
Water Phantom
1995 C&C 36 XL/kcb
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Thanks everyone for supporting this list with your contributions. Each and
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