holey cow

No, the metal is much too thick for those - And I already have one, used it a few times where you don't want to lug a Plasma Cutter (or deal with the fire hazards...) like attics - a cordless drill is enough. Popping new take-off holes in ducts and plenums is about their max.

And I have a Plasma Cutter too - just have to make a template or get a circle cutting rig for it.

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And I'll Gaa-Ron-DAMN-tee you didn't buy that 5" new for any job of less than 100 holes, or you got someone else to buy it. ;-)

Them puppies (742BB) List at $700... Ouch. That's well past 'arts and crafts and hobbies' status.

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:-)

Pretty good, yes. :-)

Out of curiosity -- could you measure the punch diameter in the

:-)

Enjoy, DoN.

The "real" sizes are the radio chassis punches. The other ones are for conduit knockouts and such.

Good grease on the threads, and a ball bearing screw head will work wonders up to some thickiness which is a function of hole diameter and drawscrew diameter.

Even nicer (if you have it) is the hydraulic powered drawscrew.

Enjoy, DoN.

If it's a standard 5" Conduit punch it's a 5-1/2" ID hole for the threads. Same as NPT for plumbing, but they punch for clearance.

If you want a real 5" hole you have to ask for it as a Chassis Punch - made the same, but... They don't sell those in volume, so hold onto your wallet with both hands when you see the price.

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Well ... *I* don't want either, but IIRC the original poster wanted to make a 5-1/2" hole.

Thanks, DoN.