How to Choose Pneumatic Fittings and Thread Types
The point of this video for today is to talk about pneumatic fittings and thread types. There is a wide variety of different kinds and I could run through a list for the next 30 minutes, and guess what you’re still trying to figure out which thread type you have. In the end it comes down to a rule of thumb. In Europe you generally run into PT thread, BSPT thread, or metric thread sizes. In the US we predominately use NPT thread. Now a lot of my customers get random machines that are going to have fittings that they have no idea what they are doing, what sizes they have, what pitch they have, ect.
Now one way to combat this is actually the SMC unifit fitting. What makes it special is that it has a conical rubber seal on the threaded side. Now the threads you don’t have to worry about. They are general sizes that are going to fit general, metric, BSPT, or PT thread types. So all it does is screws on, it is not going to screw on overly tight and then with an easy quarter turn of the wrench its actually going to seal and seat that conical seal onto your surface. Now why does that make life easier? You won’t have to have 150 different types of fittings to control one line, to replace everything in your plant. That’s confusing, wastes time, wastes money because you are going to have excess inventory because you can’t generally buy one at a time. In general it is just going to make life a lot easier.
So what I would like to leave you with is a couple simple conversions from metric to NPT. A lot of people don’t know this. So I hope it helps you out. The conversions are 3.2 mm = 1/8th inch, also 4mm = 5/32nd inch and finally 5/16th inch = 8mm. I hope after this video you take the time to go to Innnovativeidm.com and click on the knowledge center. From there go to SMC and you’ll find out all their different product offerings for the unifit as well as other one touch fittings. And remember Innovative-IDM is Home of the Legendary Customer Experience.