Re: [MW:27405] Difference between Bolt Torqueing and Bolt Tensioning

Dears,

Torque is simply a measure of the amount of energy required to spin the nut up along the threads of a bolt, whereas tension is the stretch or elongation of a bolt that provides the clamping force of a joint.

 

"Bolt Torquing" stretches the bolt as the nut is turned by a wrench. The more the nut is turned, the further it rides up
the bolt's threads. Since it can't extend into the joint, the nut "pulls" the bolt, thus "stretching" it. 

"Bolt Tensioning" uses a tensioning tool to pull the bolt until the required stretch has been achieved. The nut is
then turned freely by hand until it rests against the joint face. The tensioning pressure is then released. The applied
stretch is retained mechanically by the nut.


Regards,

Kiran

 

On Sunday, February 25, 2018 at 4:32:34 PM UTC+3, dennis.thompson wrote:

PK M,

 

Bolt torqueing refers to the circumferential moment (ft-lbs, or m-N) exerted on a bolt-nut assembly, or on a bolt and threaded-hole assembly, to tighten the assembly.

The tightening of the assembly imparts a tensile stress (lbs/in², or N/m²) in the bolt, and a compressive stress in the components being clamped between the bolt-nut assembly, or between the bolt and the component containing the threaded hole.

 

Therefore, bolt tensioning is the result of bolt torqueing.

 

Regards,

D. Thompson

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of PK M
Sent: Sunday, February 25, 2018 4:06 AM
To: material...@googlegroups.com
Subject: [MW:27382] Differance between Bolt Torquing and Bolt tentioning ?

 

Dears,

 

Differance between Bolt Torquing and Bolt tentioning ?

 

thanks.

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