Since only the original nuts from my vast assortment of similar sized nuts fit their threads, I am assuming that the threads on the end of the SMC pistons shafts are metric. Does anyone know for sure? Does anyone know the correct size for the nut?
I can’t say for sure, but I did find this via Google:
https://vexforum.com/t/answered-vex-pneumatic-nuts/21871/1
Is that what you’re looking for?
GCFKY,
It’s been a while since I bought those nuts, but I believe they are #6-40.
They are not metric. We went looking for these once but failed to turn up anything. Give SMC a call (or VEX support?).
If you read the pneumatics kit data sheet, I think you’ll see they are #6-40 nuts. See page 2, step #3. This seems to be in agreement with the response given by Eli Osornio in the link I provided above.
Below, is a link to the pneumatics kit data sheet:
http://content.vexrobotics.com/docs/instructions/VEX_PneumaticsKit-INST-0712.pdf
Unless, of course, I’m misunderstanding your question.
#6-40 are what I was looking for. I had some # 6 but not 40 threads per inch. Thanks to all.