Torque Wrench Help!

[RonanB]

Hi,

I'm buying my first Torque Wrench and need some advise! I have been given information from a product supplier on what Torque Force i require to tighten a 32mm hex nut but i think they are giving me incorrect information.

They say i need to tighten to 28-30kgf.cm (3 N.m) but that seems to low a setting? I am finding it difficult to find a Torque Wrench Insert that would allow me to even fit onto a 32mm nut. Can anyone tell me if this Torque force setting would make sense in this situation?

Thanks!

 

[RedneckWelder]

What is the application of the hex nut and what do you mean by torque wrench insert typical torque wrenches use a socket (or crows foot or torque adapter) while manufacturing torque wrenches on assy lines may use dedicated tooling

 

[cleaner]

Terminology is important for specifying torque, torque is not a force. The definition of torque is the cross product of force and radius vectors, R X F. Torque is measured in units of force times length (i.e. Newton meters). It has magnitude and direction. None of this knowledge is needed to operate a torque wrench but will become useful when using crows feet and other attachments that can alter the R vector which can require adjustments to the force applied to realize the correct torque application.

3 Nm for a 32 mm fastener could very well be correct. I would follow the design specification when applying torque to fasteners.

Torque wrenches most commonly are square drive and would use sockets but many specialist tools exist for applying torque. What exactly is the application for your fastener?

 

[454ragtop]

What is the application of the hex nut and what do you mean by torque wrench insert typical torque wrenches use a socket (or crows foot or torque adapter) while manufacturing torque wrenches on assy lines may use dedicated tooling

Say what?

 

[cvairwerks]

Say what?

AKA Torque Wrench End Fitting.... Like these:

https://www.kctoolco.com/torque-wrench-end-fittings/

 

[rumb]

Use ParkTool TW1 + 1\4" to 3\8" and 3\8" to 1\2" adapters and socket 32mm. May be it's for bearing preload on a hub. After tightening to 3nM you need add some stopper, to prevent unscrewing.

ParkTool TW1 - very usefull tool. from 0 to 7nM

 

[RonanB]

Thanks for the replies. The hex nut is part of a circular connector that has an o-ring to keep a waterproof seal. Maybe that is why the forces are low. They have recommended this Torque Wrench - QSP6N4. You can see it here:

tohnichi.com/products/adjustable-torque-wrench-CLMH.htm

The "APPLICABLE BOLT" bolt for this version is marked as M7. Is this the maximum hex size they are recommending for this Torque Wrench or does it mean something different?

 

[DSLTRK]

Thanks for the replies. The hex nut is part of a circular connector that has an o-ring to keep a waterproof seal. Maybe that is why the forces are low. They have recommended this Torque Wrench - QSP6N4. You can see it here:

tohnichi.com/products/adjustable-torque-wrench-CLMH.htm

The "APPLICABLE BOLT" bolt for this version is marked as M7. Is this the maximum hex size they are recommending for this Torque Wrench or does it mean something different?

As long as you can find a torque wrench with a scale that contains the desired torque of 30 kg-cm(preferably located in the middle of the scale), you will be fine. M7 is their recommended max bolt diameter.

'Applicable' as you have mentioned is just a recommendation. As a previous poster noted, torque is a vector quantity and does not care what devices apply it.

I would suggest a dial torque wrench for exceptionally low torque values instead of a click type you linked to. Easier to read and more sensitive.

You can use adapters from 1/4" sq to 3/4" sq for use with a 32mm socket.

 

[RonanB]

Thanks everyone for the replies... i think i have finally got my head around what is required for the job! Purchase made so once i get it in my hand i'll know for sure