Another rough way just to double check the thread pitch, is to take a good machinist rule or a good tape measure and count the number of threads in one inch. Dial calipers are real handy around a shop as Jerry said and a thread pitch gage will tell you for sure the threads per inch.

Don


1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!