Quote Originally Posted by marty989 View Post
Hi Simon, These fitting are BSPT. Did you just drill an 8.4mm hole and use a BSPT tap? Did you get away with just an intermediate or did you use a plug tap as well?
8.4mm? I couldn't remember the required drill size for 1/8 BSP but yes I just drilled the required hole and carefully taped. No didn't use a plug tap, I don't know what that is anyway so you may already be ahead of me on this! I made sure I removed and cleaned the tap and hole after about each turn or so. On some of my tapped holes I got damaged threads where it appears the high spots on the thread had been torn away. I think this was from either a blunt tap (my taps are very old) or from not cleaning as often as I should have. Mostly I have found CI to be very easy to tap.

Good luck!

Simon