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The stock nozzle has an overall length of 11.5mm.
Threads are M6x1.0 with a 6.5mm length.
Nozzle opening diameter is 0.4mm
(For reference a genuine E3D nozzle has a thread length of 7.5mm)
GiGDigit - Nozzle - 0.4mm - (Qty 2)
Malyan's Alibaba.com Store - Malyan 3d printer 0.4mm Nozzle of M200
Any nozzle with M6 threads should work.