"筛板厚度" can be translated into English as "thickness of sieve plate" or "screen plate thickness".
"Thickness of sieve plate" is a more literal translation, where "sieve plate" refers to the plate with holes used for sieving or screening.
"Screen plate thickness" is also acceptable, as "screen plate" can be used interchangeably with "sieve plate" in this context to describe the plate used for screening purposes.
Both expressions are commonly used in engineering and technical fields to refer to the measurement of the thickness of a sieve or screen plate.