Paint spray gun with two-part material needle, material needle, front needle of a material needle, and method for exchanging a front needle

A material needle for a paint spray gun, wherein the material needle extends along an axial direction and has at least one front needle and one rear needle which can be releasably connected together via a releasable connection in the form of a quick-acting connection, the front needle and the rear needle being releasable from one another in the axial direction, wherein the material needle in a region of the front needle which is designed for installation in a material-carrying region of a channel of the paint spray gun, and/or in the region of the releasable connection between the front needle and the rear needle has at least one contact surface which is designed to contact a wall of the surrounding channel of the paint spray gun while forming a sliding bearing, wherein the sliding bearing prevents the front needle and the rear needle from being released from each other in an operating state.

An exchangeable front needle of a multipart material needle for a paint spray gun, wherein the front needle extends in an axial direction and has quick-acting connection means and which is designed to form a releasable connection with a second part of the material needle which is releasable in the axial direction, wherein the front needle has a substantially cylindrical main body and at least one contact surface projection projecting in the radial direction from the main body with a radially outer contact surface, wherein the contact surface is designed such that, in an operating state of a paint spray gun, it comes into contact with a wall of the paint spray gun surrounding a channel in order to form a sliding bearing, wherein the sliding bearing prevents the front needle and the second part of the material needle from being released from each other in the operating state.