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05-23-2019, 03:51 PM
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#1
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Senior Member
Join Date: May 2017
Posts: 355
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Math quiz!
Who can help me with calculating foot pounds of torque? Let's say I had a 175 lb human... How long of an extension bar would that human need on a wrench to achieve 250 ft lbs of torque?
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05-23-2019, 04:08 PM
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#2
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
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If you had a 1 foot bar and you stood all your weight on the very end of the bar you would get 175 ft/lbs of torque.
So since you're needing 250 ft/lbs you'll need a bar 17-5/32" long. Keep in mind that you need to apply the weight at exactly that point to get the correct torque.
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05-23-2019, 04:10 PM
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#3
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Senior Member
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Location: SW Ohio
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18" would be almost perfect. In my opinion it is a bad idea to ever place all your weight on a tool. I would try figure out how much you can pull or lift and go from there
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05-23-2019, 04:17 PM
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#4
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Senior Member
Join Date: May 2017
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Awesome, thanks!
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2015 Coachmen Catalina 273TBS pulled by a 2019 F150 Platinum.
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05-23-2019, 04:21 PM
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#5
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Senior Member
Join Date: Dec 2012
Location: Franklin County, MO
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Quote:
Originally Posted by A2pfunk
Who can help me with calculating foot pounds of torque? Let's say I had a 175 lb human... How long of an extension bar would that human need on a wrench to achieve 250 ft lbs of torque?
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Torque = F(orce) X L(ength)
In your example 250 = 175 X Length
250/175 = Length
1.4285 = Length
1.4285 X 1 foot = approximately 18 inches
Therefore, you would need an 18" bar, with 175 pounds of force applied at the end of it to tighten a nut to approximately 250 foot-pounds. 
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05-23-2019, 04:26 PM
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#6
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Senior Member
Join Date: Dec 2012
Location: Franklin County, MO
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Or, for $9.99, you could get a torque wrench at Harbor Freight. (coupon valid until 4/1/19)
https://www.google.com/search?q=harb...fWtv5fLEMY6RM:
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Mike and Yvonne
and Sophie, the little white dog
2017 Columbus 320RSC
2021 Chevy Silverado 3500HD DRW 4X4 Duramax
“It's not how old you are, it's how you are old.” ― Jules Renard
"It's not the years...it's the mileage." - Indiana Jones
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05-23-2019, 04:45 PM
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#7
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Remember that the force on the bar must be applied perpendicularly; in this case, the force (your weight) is only applied straight down, so it's only correct when the breaker bar is horizontal to the ground. As the bar rotates down from horizontal, the force from your weight is reduced against the bar. (Imagine if the bar were straight down, you couldn't apply ANY weight to it.)
In the pic, with F being your weight, Ftan only equals F when the bar is horizontal.
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05-23-2019, 05:15 PM
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#8
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Senior Member
Join Date: Aug 2018
Location: Richmond VA
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Torque is measured it lbf-ft. Pound-feet. 
-- Chuck
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05-23-2019, 05:29 PM
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#9
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Senior Member
Join Date: May 2017
Posts: 355
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Quote:
Originally Posted by Capt. Mike
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If only I hadn't waited until the exact last second... Thanks for the tip, though.
Also... Wasn't 4/1/19 over a month ago?
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2015 Coachmen Catalina 273TBS pulled by a 2019 F150 Platinum.
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05-23-2019, 05:41 PM
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#10
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Senior Member
Join Date: Dec 2012
Location: Franklin County, MO
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Quote:
Originally Posted by A2pfunk
If only I hadn't waited until the exact last second... Thanks for the tip, though.
Also... Wasn't 4/1/19 over a month ago?
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Yes, it was, but google Harbor Freight coupons and you can find current ones. They are always running sales like that. I just got my URGENT BLOWOUT SALE flyer from them in today's mail. That torque Wrench is in there, but not on sale...listed at $19.99 in this flyer.
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Mike and Yvonne
and Sophie, the little white dog
2017 Columbus 320RSC
2021 Chevy Silverado 3500HD DRW 4X4 Duramax
“It's not how old you are, it's how you are old.” ― Jules Renard
"It's not the years...it's the mileage." - Indiana Jones
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05-23-2019, 06:11 PM
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#11
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Senior Member
Join Date: Jun 2015
Location: Payson, AZ
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or a 3 foot bar placed 180 degrees opposite from where the 175 lb person would stand on it and have him lift about 90 lbs.
the proper math question is "how much does a torque wrench cost"?
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05-23-2019, 06:44 PM
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#12
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Capt. Mike
Yes, it was, but google Harbor Freight coupons and you can find current ones. They are always running sales like that. I just got my URGENT BLOWOUT SALE flyer from them in today's mail. That torque Wrench is in there, but not on sale...listed at $19.99 in this flyer.
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The $19.99 one only goes to 150 lb-ft. The OP needed 250 lb-ft. HF website only lists one that will do that, for $99.99.
https://www.harborfreight.com/12-in-...nch-64064.html
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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05-23-2019, 06:48 PM
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#13
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Senior Member
Join Date: Aug 2013
Posts: 7,916
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Quote:
Originally Posted by CHICKDOE
or a 3 foot bar placed 180 degrees opposite from where the 175 lb person would stand on it and have him lift about 90 lbs.
the proper math question is "how much does a torque wrench cost"?
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Less than the Excedrine costs to get rid of the headaches from figuring the proper weight and length and increase/decrease in your weight....or finding a subject with the proper weight....and DW lying about hers.
I tried an 18” break over and broke almost every bolt I tightened. Apparently I weigh 4 or 500 lbs. [emoji24][emoji24]
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05-24-2019, 12:17 AM
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#14
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Senior Member
Join Date: May 2017
Posts: 355
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Quote:
Originally Posted by CHICKDOE
the proper math question is "how much does a torque wrench cost"?
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Probably the best answer. Thanks all!
__________________
2015 Coachmen Catalina 273TBS pulled by a 2019 F150 Platinum.
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05-24-2019, 06:08 AM
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#15
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Senior Member
Join Date: May 2017
Posts: 5,712
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Quote:
Originally Posted by rockfordroo
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So torque it twice....and you have 300 Ft-Lb. 
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