Originally Posted By: Vikas
Is there really *any* standard for measuring the torque rating of impact gun? I mean if you are persistent enough, it can eventually loosen a fastener. I have yet to see any specification which gives the time th gun is impacting and the effective torque it is applying.
There is but the manufacturers dont list or use it.
but the nut busting torque thing is basically marketing.
you take a Warm Clean GREASED bolt and tighten it to 700lb-ft
Then this impact would remove it. since real bolts you are trying to remove
arent brand new, warm, and greased... Keeping in mind that this gun itself wont tighten it to the 700lb-ft even with a warm clean greased bolt.
And that is why nut busting torque is just a marketing number.
The max forward and reverse torque is basically how tight you could tighten a clean greased bolt too.. and is usually a fairly conservative number.
The dynamic torque or how hard each impact actually is... is much less.. and never listed or used.
I was trying to google a reference to this.. and this guy on youtube has a great way of explaining it.
of course this is all far off topic
and its not a negative against this impact.. everyone in the business does it to some degree.
Just like all speaker manufacturers use both PEAK and RMS Watt ratings.. but some inflate more than others.