Does anyone know the thread size (pitch and lead) of the Anet A8's lead screw?
I have the Anet A8, I confirm the threads are Tr8x8(p2). This is explained as "Tr" for trapezoidal thread followed by the nominal diameter in mm. The digits after the "x" denotes the lead of the screw (how much does the nut advance per revolution). The value between the brackets "p2" denotes the pitch. This means that the screw has 8 (lead) / 2 (pitch) = 4 starts.

More information on threads is found on Wikipedia.