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Post  roddie Wed Sep 18, 2013 2:13 pm

The 1/4-32 thread is not a real common size at your local hardware store... If you accidentally "cross-thread" a glow-plug you'll need to re-tap the hole in the head. Some people "chase" the threads on their plugs, as a "safety measure"; just in case there's a "burr"... (which "un-noticed"... can ruin your day)

McMaster-Carr Co. stocks this uncommon size tap... as well as the "threading die"

1/4-32 TAP(s)

http://www.mcmaster.com/#standard-taps/=okb9ak

1/4-32 THREADING DIE

http://www.mcmaster.com/#standard-threading-dies/=okbcrs
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Post  Admin Wed Sep 18, 2013 6:58 pm

Thanks for posting those, good to know! Thumbs Up 

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Post  dckrsn Wed Sep 18, 2013 7:06 pm

Yes, thanks for that Roddie.
Good idea.
2-56 and 5-40 are also good
ones to have on hand for Cox's.

Bob
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Post  pkrankow Wed Sep 18, 2013 7:22 pm

You can root about on ebay and get chasing dies and taps for a whole lot less than McMaster-Carr. For the number of times you can expect it used a carbon steel tap or die that is kept with oil will outlast you. HSS (high speed steel) is more rust resistant, but still can rust.

I just ordered a couple taps and a chasing die for $20 from the 'bay, shipping included.

Phil
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Post  roddie Wed Sep 18, 2013 7:24 pm

dckrsn wrote:Yes, thanks for that Roddie.
Good idea.
2-56 and 5-40 are also good
ones to have on hand for Cox's.

Bob
Bob, did you read my other post from today? (link below) Most "hard-to-find" engine hdwe. that is common to our engines; can be found at McMaster-Carr Co.

https://www.coxengineforum.com/t5656-5-40-nuts-for-using-a-prop-stud
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Post  gcb Wed Sep 18, 2013 7:26 pm

1/4" x 32 glow plug taps and dies also used to be made by "Harry Higley" and were available at most hobby shops. Perhaps not so much since the electric revolution.

George

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Post  roddie Wed Sep 18, 2013 7:32 pm

pkrankow wrote:You can root about on ebay and get chasing dies and taps for a whole lot less than McMaster-Carr.  For the number of times you can expect it used a carbon steel tap or die that is kept with oil will outlast you.  HSS (high speed steel) is more rust resistant, but still can rust.

I just ordered a couple taps and a chasing die for $20 from the 'bay, shipping included.

Phil
Hey Phil, That's definitely a good deal. McMaster-Carr isn't cheap... but you can usually obtain "hard-to-find" hdwe. there... especially when it comes to 5-40 screws/nuts/studs... Did you see my other post today?

https://www.coxengineforum.com/t5656-5-40-nuts-for-using-a-prop-stud
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Post  dckrsn Wed Sep 18, 2013 7:33 pm

roddie wrote:Bob, did you read my other post from today? (link below) Most "hard-to-find" engine hdwe. that is common to our engines; can be found at McMaster-Carr Co.  
Oh yeah, I caught that.
Been using McMaster, Grainger and MSC for years, at work and home.

Bob
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Post  pkrankow Wed Sep 18, 2013 9:37 pm

dckrsn wrote:
roddie wrote:Bob, did you read my other post from today? (link below) Most "hard-to-find" engine hdwe. that is common to our engines; can be found at McMaster-Carr Co.  
Oh yeah, I caught that.
Been using McMaster, Grainger and MSC for years, at work and home.

Bob
I use those same suppliers when I need to. Don't forget Fastenal and the local welding supply houses. The MSC big book is awesome for gluing fuselage doublers. I have a hard time stomaching the combined price of a premium product, and shipping, when I know a tool is only going to be used a few times.

I chased a glow plug with 1/4-28 once. No!  it don't work, but the threads are PRETTY!

Phil

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