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1400Nm on a 1/2" does not make any sense. That would:
a) make the nut crack
b) strip the bolt
c) strip the 1/2" drive

Reputable professional brands like Hazet sell 1/2" impacts with 800-900Nm the max. Everything above is 'truck size', i.e. 3/4" or 1".
Likely that '1050ft.-lb.' - calculated (pulse energy of the rotating mass hitting the anvil divided by pulse duration, the latter being a quite limited variable) by the marketing dept. addressing the average consumer showing a number greater than 1000 - is like the '1500W (PMPO)' claim on cheap audio boom boxes having an integrated TDAxxxx amp with 16W RMS installed ... Stuff shown on these YT videos need maybe 3-500Nm in reality.

Studying the specs it appears 300 ft.lb. is the 'true' number ...

Sorry for the rant.
 

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Yeah, they say "breakaway". Whatever that means ;)

But it works great for crankshaft pulleys or CV joint nuts.
 

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1400Nm on a 1/2" does not make any sense. That would:
a) make the nut crack
b) strip the bolt
c) strip the 1/2" drive

Reputable professional brands like Hazet sell 1/2" impacts with 800-900Nm the max. Everything above is 'truck size', i.e. 3/4" or 1".
Likely that '1050ft.-lb.' - calculated (pulse energy of the rotating mass hitting the anvil divided by pulse duration, the latter being a quite limited variable) by the marketing dept. addressing the average consumer showing a number greater than 1000 - is like the '1500W (PMPO)' claim on cheap audio boom boxes having an integrated TDAxxxx amp with 16W RMS installed ... Stuff shown on these YT videos need maybe 3-500Nm in reality.

Studying the specs it appears 300 ft.lb. is the 'true' number ...

Sorry for the rant.
Bj
Bump starter
 
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