31-03-17, 04:28 PM
If you apply any sort of lubrication to a bolt it will have an effect on the torque.
I torque bolts up at work to between 600nm and 900nm, these bolts always have lithium grease applied, it is part of the standard operating procedure. All the torque values are calculated exactly depending on size of bolt and the operating pressure of the equipment , the bolt being greased is crucial to the calculation as some of this equipment is running at 20000 psi and we test it at up to 30000psi, an incorrectly torqued bolt can cause total failure and is like bomb going off in the test booth.
Have a look at this link below
http://www.engineeringtoolbox.com/torque..._1693.html
I torque bolts up at work to between 600nm and 900nm, these bolts always have lithium grease applied, it is part of the standard operating procedure. All the torque values are calculated exactly depending on size of bolt and the operating pressure of the equipment , the bolt being greased is crucial to the calculation as some of this equipment is running at 20000 psi and we test it at up to 30000psi, an incorrectly torqued bolt can cause total failure and is like bomb going off in the test booth.
Have a look at this link below
http://www.engineeringtoolbox.com/torque..._1693.html