Abstract: An upper jaw and tool assembly for a machine for attaching snap fastener components to fabric is operable to safely receive and advance upper fastener component halves for the assembly thereof with lower component halves. A stationary housing of the assembly is mountable on an attaching machine so that the lower end of the housing is spaced only slightly above the guide plate of the machine to minimize operator risks from internal moving components of the assembly. Fingers mounted on the housing receive and position successively fed upper component halves therein and an upper tool continuously advances the halves downwardly to assemble them with lower component halves. The assembly operates without conventional vertically reciprocating jaw components and hence can be operated with a minimum of operator risks.