Hydraulic Rams

[Lil Giants]

You'll still need seals on both rod & piston to keep the fluid in.

I've never selfmade any cyls myself, but I would assume you would need 005 to 010 clearances between metal parts.

[Jerf123]

Thank you lil giants that's my argument with my dad, we're making a hydraulic valve for my project . I said it needs o rings on the piston, he said no it it is within .0001 it shouldn't but I still say it needs o rings. If I cut a slot in the piston and inset a o ring ,not to the od but a little larger.where the o ring has to be compressed ?