ScubaLawyer wrote:Ok you machinist types out there. I started looking for a bottoming tap to clear the threads on my SW elbow for the new burst disk.
I have confirmed it takes a 3/8-24 and have found many taps that size. However, it looks like some taps are UNC (course) and some are UNF (fine) both in the 3/8-24 size. Being the perfectionist I am, I'd like to use the correct tap. Here is my question: Can anyone point me to a source that will tell me if 3000psi 3/8-24 burst disk threads are UNC or UNF? maybe it doesn't make a difference? I've been researching taps until I'm blue in the butt and I figure someone here might know the answer. Thanks. Mark
Taps, Left to right: 3/8-16 (UNC), 3/8-24 (UNF), 3/8-24 homemade bottoming tap I should have added this photo to my previous post describing the thread differences.