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[lvb125]

Being a newbie, I have a few questions regarding the usage of torque wrench:

1, If the minimum reading of my torque wrench is 4.5nm, is there anyway I could get 3nm ?

2, What is the reason behind multi-stage torque specifications such as "Torque to 80nm then go an extra 90 degree"? Would it make any difference if the second stage 90 degree is turned with more force?

3, Does the initial position of bolts etc matter? Especially for specifications that includes turning angles only.

Thanks

[e92_enthusiast_1]

No.

Originally Posted by lvb125

Being a newbie, I have a few questions regarding the usage of torque wrench:

1, If the minimum reading of my torque wrench is 4.5nm, is there anyway I could get 3nm ?

Main reason would be to prevent overtorquing, it's safer. No, the second stage spec is not force related but position related.

Originally Posted by lvb125

2, What is the reason behind multi-stage torque specifications such as "Torque to 80nm then go an extra 90 degree"? Would it make any difference if the second stage 90 degree is turned with more force?

No.

Originally Posted by lvb125

3, Does the initial position of bolts etc matter? Especially for specifications that includes turning angles only.

Thanks

[#Tee]

multistage torquing procedure is required by some manufactures specifically for cylinder head application. they require head bolts to stretch and typically should not be reused.

[georgelb]

Originally Posted by lvb125

2, What is the reason behind multi-stage torque specifications such as "Torque to 80nm then go an extra 90 degree"? Would it make any difference if the second stage 90 degree is turned with more force?

http://user.xmission.com/~kd7olf/torque.html

You can get a torque angle dial that attaches to your torque wrench.

[VMRWheels]

Originally Posted by #Tee

multistage torquing procedure is required by some manufactures specifically for cylinder head application. they require head bolts to stretch and typically should not be reused.

+1

[jwzimm]

Originally Posted by VMRWheels

+1

They also use this in some bolts in the suspension. The purpose, as stated, is to bring the bolt to a set torque and then plasticly deform/stretch the bolt. These bolts should be replaced as they do not return to original state when they are loosened again.