These fittings have VICI Jour double ferrules, which grip the tubing twice for added stability. For 1/16" OD tubing fittings with 10-32 threads.
Reuseable nuts and replaceable ferrules for 1/32", 1/16", and 1/8" OD tubing. These are generally suitable for pressures to 280 bar (4000 psi).
This combination of PPS nut, PEEK ferrule, and stainless steel bushing allows a high pressure connection in a 1/4-28 flat-bottomed fitting detail.
Biocompatible 1/16" ferrules for high pressures make a good alternative to titanium ferrules in titanium valves.