.125 wall is really thick and could still have threads in it making the minor diameter less but still adequate. I like 4130 as it is very consistent and strong material, reasonably priced, easy to find and finishes nicely. It is what they use to build tube chassis and I use it to make all the Extension tubes I do for CO2 Tube guns like the QB/160 etc.I do not like to thread tube OD's or ID's on High Pressure set-ups preferring to use Cap Head Allen Head in Shear (Usually 4 or more 1/4X20 TPI). FX uses this arrangement and I do on US FT and Hunter builds. It is a very good way to plug tubes without losing tube wall thickness.4130 is going to be DOM(drawn over mandrel) as most tubing is.TimmyMac1
What wall thickness do you use for the 4130 in a 3000psi application?
Thanks Sean. Does this tubing have a good finish for an oring seal?