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by GallopingGhostler Thu Sep 12, 2024 8:32 pm
Cox Engine of The Month
Stripped glow-plug threads?
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Stripped glow-plug threads?
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
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
Re: Stripped glow-plug threads?
Yes, thanks for that Roddie.
Good idea.
2-56 and 5-40 are also good
ones to have on hand for Cox's.
Bob
Good idea.
2-56 and 5-40 are also good
ones to have on hand for Cox's.
Bob
dckrsn- Diamond Member
- Posts : 2750
Join date : 2010-10-21
Age : 71
Location : Long Island, New York
Re: Stripped glow-plug threads?
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
I just ordered a couple taps and a chasing die for $20 from the 'bay, shipping included.
Phil
pkrankow- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
Re: Stripped glow-plug threads?
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.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
https://www.coxengineforum.com/t5656-5-40-nuts-for-using-a-prop-stud
Re: Stripped glow-plug threads?
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
George
gcb- Platinum Member
- Posts : 908
Join date : 2011-08-11
Location : Port Ewen, NY
Re: Stripped glow-plug threads?
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?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
https://www.coxengineforum.com/t5656-5-40-nuts-for-using-a-prop-stud
Re: Stripped glow-plug threads?
Oh yeah, I caught that.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.
Been using McMaster, Grainger and MSC for years, at work and home.
Bob
dckrsn- Diamond Member
- Posts : 2750
Join date : 2010-10-21
Age : 71
Location : Long Island, New York
Re: Stripped glow-plug threads?
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.dckrsn wrote:Oh yeah, I caught that.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.
Been using McMaster, Grainger and MSC for years, at work and home.
Bob
I chased a glow plug with 1/4-28 once. it don't work, but the threads are PRETTY!
Phil
pkrankow- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
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