Torque wrench for 1-20 Nm - is it worth? - Ducati Supersport 939 Forum
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post #1 of 19 (permalink) Old 11-08-2019, 04:40 AM Thread Starter
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Torque wrench for 1-20 Nm - is it worth?

It's a noob question so if you are allergic, don't read further and have a good time : )


I wonder if I should also buy a torque wrench for small values to use on Supersport. For example there are parts that require 6 Nm +/- 10% torque or are generally in a range of 2 - 20 Nm. I have so far only for chain adjusting a bigger one.
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post #2 of 19 (permalink) Old 11-08-2019, 05:02 AM
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Hi mate! You will need a wrench for up to 200 N.m, 230N.m to be precise needed for rear sprocket is the maximum torque value I think.
You need two wrenches covering the whole torque range.
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post #3 of 19 (permalink) Old 11-08-2019, 05:13 AM
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Sorry, I just didnt answer your question. I think a 1-20N.m is may be a little low value to be one of the two wrenches youll need to cover the range 10 - 250/300 N.m. Torque values that low, 1-2-5N.m... well I torque them approximately. A 10-60 and a 50-250 Nm will work.
Let’s see if our colleagues here agree with me.
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post #4 of 19 (permalink) Old 11-08-2019, 05:33 AM
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Quote:
Originally Posted by Grossi.BP View Post
It's a noob question so if you are allergic, don't read further and have a good time : )


I wonder if I should also buy a torque wrench for small values to use on Supersport. For example there are parts that require 6 Nm +/- 10% torque or are generally in a range of 2 - 20 Nm. I have so far only for chain adjusting a bigger one.
I have one, one of three torque wrenches, that is 2-14nm. I feel if the range is too wide on a torque wrench then it could lose its calibration at points within its range. Not a fact, it is only my view.
I found it in a bicycle shop. To be honest I do use it but a lot of the torque specs are 6-10nm and I just do them hand tight with medium strength threadlocker.
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post #5 of 19 (permalink) Old 11-08-2019, 08:26 AM
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...but a lot of the torque specs are 6-10nm and I just do them hand tight with medium strength threadlocker.
Agree with this 100%.

After turning enough bolts over the years, you kinda just develop a feel for it. Not accurate, but at that low a level, it doesnt matter too much.
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post #6 of 19 (permalink) Old 11-08-2019, 11:08 AM
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It really depends on how much you trust yourself. Remember - 10 foot-lbs is actually ten pounds of pressure at the end of a foot long bar. You don't need a special tool; if your math is good enough you can just hang weights on the end of your socket wrench. Multiply foot-pounds by 12 to get inch pounds - 10 foot-lbs is 120 inch-lbs. How good is your Metric conversion? How much does a Newton weigh?

I used to think I had a well calibrated arm. I do maintenance on the clean-room "tools" used in microprocessor manufacturing. I realize that the expectations at work are different than on a motorcycle, I do high volume manufacturing with chemical deposition at the Angstrom scale - those torque wrenches get calibrated multiple times through the year, regardless of number of uses.

I now own three torque wrenches: 4-16 Nm (1/4" drive) that is mainly for the M5 and M6 fasteners, 20-105 Nm (3/8" drive) for the bigger M8 and M10 bolts, and 55-325 Nm (1/2" drive) for the wheel nuts. Tolerances are tolerances. I really don't want to deal with stripping threads on an engine block hole, mostly because re-threading a blind hole can be daunting if you don't know what's behind it.
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post #7 of 19 (permalink) Old 11-08-2019, 11:43 AM
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Originally Posted by se7en View Post
Agree with this 100%.

After turning enough bolts over the years, you kinda just develop a feel for it. Not accurate, but at that low a level, it doesnt matter too much.
Me too.

I have 3 torque wrenches. One from 30 to 205 Nm that I've had for years. When I bought the Multi I needed a bigger one for the 230 Nm rear wheel torque so bought another from 50 to 300Nm. When I was working on a Suzuki GS400R engine I needed something like 18 Nm torque for the head nuts so bought a small 5-25 NM torque wrench but it doesn't get used much.
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post #8 of 19 (permalink) Old 11-08-2019, 11:57 AM
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How good is your Metric conversion? How much does a Newton weigh?
I think you should really simplify your life and forget the conversions alltogether. Go metric and do all your maths in multipliers of ten instead of odd fractions of a unit.

1 Newton is 0.1kgs on earth for all practical matters.
(1 kg is one litre of water, litre being a cube of 0.1m x 0.1m x 0.1m, water which freezes at 0 degrees of Celsius and boils at hundred, etc..., etc...)

Sorry for the tease, but being a victim of imperial system in the past, I just can't resist the temptation.
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post #9 of 19 (permalink) Old 11-08-2019, 12:01 PM
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I think 20nm is something like 14lb ?

This is just hand tight. I would guess that normal Allen Wrenches would be ballpark accurate.

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post #10 of 19 (permalink) Old 11-08-2019, 12:03 PM
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You can find the small 1/4" torque wrench at a bike shop.

I agree with the 3 wrench system totally.
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