SMC Corporation of America
Elite Part Number Search

Refer to the product selection section, which can be found here.
Also, refer to the “Vacuum Adsorption Transfer System Model Selection Software,” which can be found here.

(e.g., when the leakage rate is 20 L/min (ANR), the vacuum pressure of a ZH10□SA is -20 kPa and the vacuum pressure of a ZH10□LA is about -32 kPa, so the L type has a higher vacuum pressure)
The ZH series catalog can be found here.