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Home Brew Forums > Home Brewing Beer > DIY Projects > Kettles, Mash Tuns, & Hot Liquor Tanks > Size of Greenlee knockout punch for 1/2" barb
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Old 02-21-2013, 09:13 PM   #1
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Default Size of Greenlee knockout punch for 1/2" barb

Hello.

I need to drill a hole on my stainless lid on my pot for circulation. I need to let the hole fit for something like this:

http://morebeer.com/view_product/174..._x_1_2%22_Barb

My understanding is that the hole needs to be 1/2" so I'm wondering if this would be ideal for a hole (or might it be too small?):

http://www.ebay.com/itm/NOS-Greenlee...item5aeba7acfa

Regards,
Johann

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Old 02-21-2013, 09:23 PM   #2
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I'd have to go home and check mine, but I believe you want the 13/16 knockout punch for 1/2" inner-diameter fittings. See, e.g. http://www.homebrewtalk.com/f170/wha...-valve-339595/

EDIT: I see that is a conduit punch, in which case it makes a 7/8" hole, which might work.

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Old 02-21-2013, 09:26 PM   #3
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No, the hole needs to be 7/8" actual because 1/2" NPT measures about .84". That one you linked to is a radio/chassis punch which means the dimensions listed for the hole size is actual. A true conduit punch is sized for nominal pipe dimensions.

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Old 02-21-2013, 09:38 PM   #4
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So, this might work isn't it?

http://www.ebay.com/itm/Greenlee-721...item4d09ce9006

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Originally Posted by Bobby_M View Post
No, the hole needs to be 7/8" actual because 1/2" NPT measures about .84". That one you linked to is a radio/chassis punch which means the dimensions listed for the hole size is actual. A true conduit punch is sized for nominal pipe dimensions.
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Old 02-21-2013, 10:03 PM   #5
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1/2 inch knock out punch makes a 7/8 inch hole. Are you looking to make 1/2 hole? I punched a 7/8 hole for my valve and 1/2 hole for my thermometer. The knockout punch that makes the 1/2 inch hole was a bitch to find. Finally found it on amazon.

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Old 02-21-2013, 10:06 PM   #6
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I need a hole big enough so I can put this in: http://morebeer.com/view_product/174..._x_1_2%22_Barb

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1/2 inch knock out punch makes a 7/8 inch hole. Are you looking to make 1/2 hole? I punched a 7/8 hole for my valve and 1/2 hole for my thermometer. The knockout punch that makes the 1/2 inch hole was a bitch to find. Finally found it on amazon.
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Old 02-21-2013, 11:16 PM   #7
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1/2" radio/chassis punch = 1/2" hole (the OP's first link was to this)
1/2" conduit punch = 7/8" hole (the OP's second link was to this)


I like the multi-size kit for like $75

http://www.ebay.com/itm/Greenlee-723...item3a7e9729d6

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Old 02-22-2013, 12:02 AM   #8
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Ok, I.bought your recommendation

Quote:
Originally Posted by Bobby_M View Post
1/2" radio/chassis punch = 1/2" hole (the OP's first link was to this)
1/2" conduit punch = 7/8" hole (the OP's second link was to this)


I like the multi-size kit for like $75

http://www.ebay.com/itm/Greenlee-723...item3a7e9729d6
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