Difference between PT and PT4 Key | Ask the Experts

Question:

I have a Yale factory key, but it only has a single letter stamp on it, but will not fit into any Yale cylinders. What could it go to?

 

Answer:

A lot of larger manufacturers make competitors keyways. For instance, Yale actually makes Best Small Format keys in the A-M keyways (not including I) and Yale also offers the Schlage C keyway. It can be confusing because the keys will often have a Yale head. Yale is not alone in this, so if you ever have a factory original key that may not fit into the initial cylinder you think, try to find out if it could fit into the cylinder of a different manufacturers keyway.

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