Experience Re-Tapping a Steam Radiator Air Vent Hole?

I have hot water steam radiators with 1/8″ air vent valves.  Upon going to replace one of the air vents I discovered that the threads on the the famlae portion of the radiator itself are stripped and it subsequently stripped my new vent upon trying to install.  I would assume the threads need to re-tapped and am looking for any guidance on the process.  I think that drilling out with a 7/16″ bit and then re-tapping with a 1/4″ x 18 NPT tap woiuld create appropriate new threads.  I think I could then insert a 1/4″ to 1/8″ reducer bushing to fit the 1/8″ air vent.  Does this sound appropriate?  Appreciate any guidance!

nalusurf

in Plumbers and Plumbing 12 years and 3 months ago

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nalusurf | 12 years and 3 months ago

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Thank you all!  Probably not a bad idea to begin to gather a few taps of various size…I am sure they will come in handy at some point!

Master Plvmber | 12 years and 3 months ago

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I’m with pig-three’s suggestion, though the first answer is correct too.

pigthree | 12 years and 3 months ago

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plans sounds fine.  you could also try to run a 1/8″ tap into the hole again to see if it will correct the threads before you drill a larger hole.

ejalbk | 12 years and 3 months ago

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I believe they make 1/4″ valves so you can probably even dispense with the bushing if the air valve was stripped and needs to be replaced anyway. Your plan seems fine to me….