Hi,
The HEQ5 is usually specified around the marketplace as 15Kg excluding counterweights. Other brands might be different.
From a design standpoint the amount of counterweight could obviously vary, depending on what else you hang off the mount, but if the critical performance parameter is really the torque of the motor + gearing, and not the dead-weight load on the bearings, then you could specify it that way.
Cheers
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