Grease Zerk threads

[DaveB]

I need to drill and tap some home-made bushings for grease zerks. Does anyone know what tap is used for cutting the correct threads ?

 

[Bob B]

it may vary, but I know @ tera they are 1/4-28

 

[OrvisKrawler]

thats what I use as well..

 

[DaveB]

Thanks, They looked like a tapered pipe thread so I thought they might be someting that I didn't have a tap for. I have 1/4-28 so I'll use that.

 

[bryson]

Thanks, They looked like a tapered pipe thread so I thought they might be someting that I didn't have a tap for. I have 1/4-28 so I'll use that.

I know there are a few different threads, and I don't have small taps, so I've always just drilled the hole a bit small, and threaded them in. As long as you don't have the worlds cheapest zerks (shotty metal) they seem to cut themselves in just fine.

 

[UNSTUCK]

There is an 1/8 in pipe thread zert. I can't remember what thread pitch they are right off, but either of the two threads work just fine.

 

[Corban_White]

Most are 1/8 NPT.

 

[MRJ]

There are all kinds of threads. The easiest for you to do is 1/4-28. you can pick up the zirks for that thread at fastenall.

 

[DaveB]

Thanks for all the feedback, I'll have to check out the different options.