5 lever mortice deadlock for very thick timber door

7 Mar 2010
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United Kingdom
I'm in the process of having a solid oak door made but because of the design it needs to be 56mm thick. Great. Nice and secure. But ....

All the best BS3621 5 lever mortice deadlocks seem to specify a maximum door thickness of 54mm. Ideally I wanted some sort of key restricted access and hoped a Chubb/Union deadlock would meet the bill but I can't find one that will fit a door more than 54mm thick. I don't particularly want to end up with a bumpable or pickable cylinder deadbolt. Does anyone have any suggestions?
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It is known as a rim length key. Suitable for the Chubb/Union 3G114 type mortice locks.

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