Hello Folks.
I need to find out the thread size of a glow plug.Someone told me 1/4 x28 so it's not.
If anybody knows for sure please help out with advise.
Thanks ahead,
Mitty

They are 1/4-32.

They are indeed 1/4 -32. Taps can usually be had from a large fastener house over the counter. In smaller towns the local hardware can usually have one for you in a weeks time.
Also several hobby hardware supplier stock them.
You might also consider purchasing a 1/4-32 die at the same time to chase the threads on glowplugs prior to installation. It can save damage to a head caused from rough threads on the plug body.

Went to the ace,sears and went to the machine shop at work.They never heared of 1/4x32.Are we talking about 1/4x32 NPT??
Please advice.
Thanks.
Mitty

Its not a tapered thread. 1/4x32 taps and dies should be available at any serious machine supply house (not a hardware store) and Harry Higley sells them also through hobby shops.

Try an industrial supplier, ie, that sells to machine shops. They are not that uncommon...

AJC

Micro fasteners also sells a tap and a die.

Both the tap and die are available from Tower Hobbies.

1/4"-32 NEF (National Extra Fine)