V6 and MK8 are not automatically replaceable nozzles. Even if the thread is threaded, the length, sealing surface and point position may vary.
In the case of a classical assembly, the nozzle must be correctly attached to the intended internal part. The seemingly tight nozzle that stops on the block can leave it in the wrong place.
Do not force the work to thread and do not use a uniform torque for all executions. The wrong length may change the point position relative to the sensor and the liner.
Select products according to the above criteria; the list is not a confirmation that they are all interchangeable.
3D printing nozzle 0,4mm E3D V6
3D press Hose 0,5mm E3D V6
3D press Hose 0,6mm E3D V6
Nozzle for 3D sS printing 304 0,8mm MK8
Universal key for installing nozzles for 3D printer metal powerful manufacture