There is an older style 55 series dog screw with narrower threading than the more recent design.
The CURRENT part is:
965827: For 227 Dog Key (Standard 5/32), Double Lead
The saleable product will be sold as packages which can be found in the price book. As of this writing, the package is 090029.
The OLD part is:
959859: For 227 Dog Key (Standard 5/32), Triple Lead OLD
As of this writing, there is no known source for the old screw. It has been discontinued and is not stocked through normal channels.
Note: "Lead" is the ridge of the screw. Double lead means the screw tip has to starting points for the lead, triple indicates three starting points.
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