I was looking at a spacing and depth chart and they listed a MACS of 4.  What is this?  How does it effect simple key cutting?

Hello Greg,

A MACS is Maximum Adjacent Cut Specification.

This means that key cuts can't exceed the number shown when the cuts are next to each other.

Example - in your MACS 4 you can't have cuts that are 39743.
This is because a 3 to 9 is 6 difference.  The reason that's an issue is because the actual depth of those cuts are so great - deep valleys and high peaks - that the key would either not go in, not come out or would eventually cause a major issue with the lock working.

Most brands of locks have a MACS of 5 or 6.  If you have one with 4 that tells me that there aren't many depths available for that lock or that there's another issue with the design.



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