I have a part i need to figure out what the thread count/size is so i can get a tap the correct size. All i can tell you is that it is 20tpi and a 5/8-11 nut falls down on it about half way then sorta tightens up before i builds up to much pressure then jumps the threads. Thanks for any help. I am trying to make an adaptor to convert an 1969 spark-plug compressor to pump up tires to 1/2" pipe thread for my T... so not totally off topic haha! I am using a brass reducer with 1/2pt on the outside and 3/8ths on the inside. Im planning to drill out and tap new threads on the inside. Here is another question... can i just bore out the hole slightly smaller than the outside of the threads and muscle it in there with jb weld around it?
14 or 18 MM on the spark plug. ws
If you are asking what is the spark plug thread?, there are four standard SAE spark plug threads, all metric: M18 x 1.5; M14 x 1.25; M12 x 1.25; and M10 x 1.0
Maybe it would be easier and just to use a hand pump to fill tires.
I don't know the first thing about a spark plug compressor, but if it's what I imagine it to be wouldn't that mean you're inflating your tires with a fuel/air mixture? It does not sound like a great plan to me....
"All i can tell you is that it is 20tpi and a 5/8-11 nut falls down on it about half way."
As it's a spark plug thread, that tells me that it's M14 x 1.25.
If your compressor is designed for heads that utilize 14mm sparkplugs, you can purchase 14mm adapters from the vendors:
Thanks. great info! The compressor i have actually uses uncarburated air to pump the tire.
Thanks Nathan. Had me worried....
p.s. does anyone have one of those adapters they would like to sell? I dont need the whole set! haha
Henry - I have used one of those for years! J.C. Whitney/Warshawsky used to list them in their catalog.
To add to what Nathan said, they work very well and are an interesting accessory to use, display and demonstrate. They work so well, and pump such fresh air that you can't even SMELL gasoline in the air that this device pumps.
From an earlier thread . . .