Abstract: A packingless shaft seal between an apparatus housing and a rotatable shaft. The shaft seal includes a sleeve mounted on the shaft and a seal housing mounted on the apparatus housing and around the sleeve. The sleeve has a variable pitch thread extending from its ends within the apparatus housing to the seal housing and a cylindrical portion within and spaced from the inner surface of the seal housing. The variable pitch thread is directed toward the interior of the apparatus housing so that upon rotation of the shaft, material entering the thread is moved back into the apparatus housing. The seal housing has a chamber therein through which a temperature control material flows to control the temperature of the material passing between the seal housing and the sleeve.