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Drill Bit of Chassis Punch for 1/4" NPT

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signal2noise

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Feb 23, 2011
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Greetings,

I am modifying my keg mash tun and adding a custom made thermowell that will accept a digital temperature probe. I am using a 1/4" tube compression to 1/4" NPT, where the NPT will pass through the keg wall. The 1/4" NPT outside diameter measures 0.518" on my caliper but an online source says the nominal outside diameter is 0.540".

Question is, should I use a 5/8" (0.625") bit or chassis punch to get through the keg or should I use a 1/2" (0.50") bit/punch and then grind out the hole a bit more using a dremel tool and metal cutting wheel?

Suggestions and advice would be very appreciated.
 
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