Greenlee knockout punch on SS sink?

Question

I have a set of Greenlee knockout punches used for, obviously, creating holes for electrical conduit. I've cut holes in some fairly thick metal over the years, and these tools have never flinched.

I'm wondering if they're sturdy enough to create a hole in a stainless steel sink. I'm not sure of the gauge. It's not the lightweight super-thin junk you find at home centers for $50, but it's not commercial, either. I'd hate to ruin either the sink or the tools.

I'm not squeamish, and I'm reasonably sure this will get the job done, but if anyone knows (maybe the hard way) why I shouldn't try this, please chime in.

Thanks.

G. Morgan · Accepted Answer

Subject: Greenlee knockout punch on SS sink? Newsgroup: alt.home.repair => Robert Barr I have a set of Greenlee knockout punches used for, obviously, creating

Do you have the hydraulic set? Just curious... I've punched considerable metal with the hydraulic set. Let us know.

Barry · Answer

You may not find good results with a regular knock out set.  Theydo make knock outs for stainless.  They are expensive.Barry

Robert Barr · Answer

Unfortunately, I could never justify the cost of a hydraulic set. This is the manual type which I use a ratchet on.

I've seen these dies rated at 10 gauge (but 10 gauge of what?), and the good Elkay sinks are 18 and 20 gauge, so the thickness isn't a challenge. I'm pretty certain that SS is tougher than the stamped stuff that electrical boxes are made of.

I guess we will see soon.

William · Answer

considerable metalThe 10 gauge rating  is on mild steel.  I don't have my greenlee catalog infront of me but, they are also rated for SS in thinner sections ( I think to16 gauge )Remember that the conduit punches punch odd sized holes,  they are markedfor the size of the conduit not the hole!William.....

BobK207 · Answer

Depends on the punch kit & the punchesIMO 10 gage stainless is going to be tough to punch without thehydraulic setupHere's so info on a Greenlee punch for use with hydrauliuc tool.28160 - Greenlee28160-Slug Splitter Punch 1-1/4" Conduit Size (NEW)Slug-Splitter heavy-duty punches are designed to punch up through 10gauge stainless steel. Excellent abrasion resistance for punchingfiberglass and plastic.

Greenlee knockout punch on SS sink?

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