As far as I know Chubb made 3 different key sizes for each size of lock, together with this they also had at least 3 different sizes of bolt throwing steps on the keybits.
Another security feature was to add 1 or more wards to prevent the entry of a similar sized key (by Chubb or any other maker) which reduces the chances of someone using a false key to trip the detector.
So all in all Chubb used different sized keys (diameter of pipe or stem), throwing steps and wards to act as a form of key control.
Chubb also made their keys out of different materials, most commonly are the gun metal type but on special orders they were made from copper or brass (these last two were made from copper or brass to prevent the chance of sparking when used on volatile environments like ammunition/gunpowder storage or flammable chemicals etc, they could also be used in harsh environmental conditions like on naval vessels or on seaside buildings, I can’t imagine that they would be used frequently because copper and brass are quite soft metals so they would bent or wear quite easily).
Nice keys, Chubb keys always look great when cleaned up, I also love the sound they make when struck together, very high quality pieces, it’s a pity no one makes locks or keys like that anymore.
Kit
