A flow metering turbine comprises a tubular body through which flows the fluid to be measured. The tubular body houses an upstream spider and a downstream spider each formed by a hub and fixed vanes, bearing the hub in the tubular body. The mutually facing ends of the hubs have a cavity on the axis of the tubular body for receiving a support bearing and thrust bearing. A screw member formed by a hub bearing vanes and a shaft is located between the spiders, the ends of the shaft being located in the support bearings of the spiders and against the thrust bearings. At least one fluid duct runs through each spider, opening into the cavity in line with the support bearing and thrust bearing.
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