MILLING TOOL WITH FLUID FLOW ARRANGEMENT

A milling tool (21; 121) includes a shaft portion (23) including a first passage (25; 125) extending from a first end (27) of the shaft portion (23), and a head portion coaxial with the shaft portion, the head portion (31; 131) extending radially outwardly from the shaft portion. The head portion includes two flank surfaces (33, 35, 35?; 133, 135) and an outer peripheral edge (37; 137) between the flank surfaces. The outer peripheral edge includes at least one recess (39; 139a, 139b) in which at least one cutting insert (41) is mountable. At least one second passage (49; 149a, 149b) extends between and remote from the flank surfaces of the head portion from the first passage to proximate the at least one recess (39; 139a, 139b). The first passage (25; 125) comprises a first portion (61) having a first diameter and a second portion (67) having a second diameter, and an annular rib (73) and annular groove (75) at a transition between the first portion (61) and the second portion (67), the rib (73) comprising at least one opening (81) therein extending between the second portion (67) and the groove.