Abstract: A combination of a perforated plate for a rotary meat grinder and a stud journalled in a cylindrical bore in the plate and adapted for rotatably supporting an auger which impels meat in the direction of the plate and a knife interposed between the auger and the plate in shearing relation to the upstream face of the plate. The plate has a disk-like body portion with an integral generally cylindrical hub portion projecting downstream from the body and a counterbore adjacent to its upstream face and surrounding the cylindrical bore, and a stud shaft portion journalled in the cylindrical bore defines with the walls of the counterbore an annular bone-collecting pocket around the shaft portion. A discharge passage radially offset from the first bore extends from the pocket through the hub and a discharge tube secured to the downstream end of the hub receives bone particles discharged from the pocket in the grinder.