Bolt torque values

[sree60]

Dear members

I need a clarification on torque values .
I have a torque table which says that
for 8In bolts torque values are Min 8Nm and
Max 10 Nm .These values are given under a table column which reads serrage electrique / rondelle contact

Similaly for same size under serrage mecanique / rondelle onduflex the torque values are min 15 Nm and max 18 Nm

Can anyone explain why the torque values are different/
Is it something to do with methods of torquing?

Regards

Sree60

 

[desertfox]

Hi

Maybe one set of figures is for dry assembly and the other for lubricant assembly


regards
desertfox

 

[MintJulep]

serrage electrique - electgrical connection

serrage mecanique - mechanical connection

 

[sree60]

mintjulep

can u explain further? What do they signify in this context-mechanical and electrical connection ?.
something to do with method of torquing?

Thanks if u can clarify


sree60

 

[CoryPad]

I think it is application based. For electrical connections that have low applied forces and low strength members, you use low torque (and low preload). For mechanical connections that have high applied forces and high strength members, you use high torque (and high preload).

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[sree60]

Thanks for the help

sree 60