Abstract: A dry gas seal for turbo machinery and the like includes a rotating shoulder and mating stationary face seal forming a seal between an associated shaft and outer housing. The shoulder is supported in a segmented holder having a machined shroud in which the shoulder is retained, and a rotor mounted on the shaft and detachably connected with the shroud to facilitate machining the shroud when disassembled from the rotor. The face seal is supported in a segmented housing having a machined first member mounted in the stationary outer housing and retaining an inside portion of the face seal, and a second member retaining an outside portion of the face seal and being detachably connected with the first member to facilitate machining the first member when disassembled from the second member.