Torque

what is the unit of the torque you want to convert?

The following link will help you:

http://www.onlineconversion.com/torque.htm

WHILE TIGHTNING SOME BOLTS,SOME MANUFACTURER RECOMMENDS ANGULAR TORQUE LIKE INITIAL 60lbft + 90degree angular torque.So i want 2 know that is there any method to convert angular torque to other units on torque wrtench?

It appears that the term "angular torque" is a misnomer. The example specification asks for the bolt to be torqued to 60 lb-ft, then (without further reference to torque) to tighten it another 90°. There is nothing to convert; you just do what it says.

Hello Harry,

The spec is used to try to overcome some of the inherent inaccuracies of "torque" when tightening bolts. The idea is often to tighten a joint "snug-tight" and then, mark the nut (or bolt head) so that you can turn it a certain amount.

Turning the nut by a defined amount of rotation is a surprisingly accurate way of achieving bolt preload. The problem is, just where does one stop the initial torquing process in order to mark the fastener. "Snug-tight" is a ludicrous spec!

If the flange is rotated, if it contains a gasket, if the fastener isn't perpendicular to the axis of the hole, if the washer is deformed, if the spotface is damaged, etc, etc, your initial mark is going to be "off". Hence, your assumption that you've applied the proper preload is also going to be out to lunch.

In your case, you've actually been given an intial torque spec. It's not much better than the above: If the applied torque doesn't produce the right amount of preload (because the actual fastener friction is either less or more than was originally "guessed") your starting mark is going to be "wrong"

Getting back to your original question: How can you convert the torque-and-turn spec to only a torque spec:

• Back-calculate to determine the desired bolt load (Fi) using -

• (360 x δ) / pitch

• Guess what K-Factor might have been used to come up with the initial 60 ft-lb spec.
  

Then,

• determine what the elongation is going to be at that load
• take a wild a** guess at what the K Factor might be
• use that K Factor in the short torque calculation
• apply the resultant "target-torque"
• see how the actual elongation compares to the required elongation
• adjust your applied torque until you achieve the necessary elongation.

Have fun!