I do not see any dimensions for the hex keyhole on the plans for the 9274M. Can you provide those dimensions?

The dimensions of the hex keyhole are 8mm / 5/16" and will suit a standard hex key / allen key, or purchasing our 9608 - Hex Wrench Actuation Tool for Panel Locks.
 
You can find out more from our Panel Lock specification sheet here or under Technical Details.

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