Puzzled over the claimed torque of impact drivers.

I have battery & mains Makita impact drivers, both claiming torque of 130 +
Nm. Both certainly punch in screws & coach bolts with ease, much better
than a drill driver.

Two examples lately where they failed to cut the mustard. Inserting 140mm x
6 mm multi monti's into brick (correct size pilot, clearance & depth of
hole) where the impact driver simply stopped leaving an inch of the fixing
protruding.

Another where a customer had used some 300mm timber connectors on railway
sleepers & his drill driver left several inches protruding. Tried the
impact driver which still wouldn't drive them completely flush.

In both cases I used a chuck adaptor in a mains SDS & drove the fixings
right in. No torque figures for the mains SDS, a 600w green Bosch with a
clutch, but I'm certain it wouldn't be 130 + Nm.

What's going on here? Is there 'torque' & 'torque'? Is it something to do
with Clarkson?


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk