Here are the screen specifications for making the common grades of rye flour, including white wheat flour, which is a flour that you will sometimes encounter in the historic record.

Flour Type	Mesh Size	Particle Size (µm)	Extraction Rate
White Rye	60-70	250-300	65-70%
Light Rye	50	300	~80%
Medium Rye	40	425	~85%
Wholegrain	No sifting	N/A	100%