I have never thought about the type of screws in my power tools, let alone the measurement system used the measure them.
Things changed this weekend. This weekend I was planning to
I have an inch-system micrometer which measures thickness in fraction of inches. I used this micrometer to get an approximate measurement of the screw. I thought the screw is 5/32” thick at its threads. I could not find any odd fractional machine screw at my local Lowes. I picked up a few 8-32 ¾” screws. When I came home and tried the new screws on router, they did not fit.
The next step was to do some online research on this particular screw. eReplacement parts.com has a nice picture of all the router parts for DW621
Fig # 7 in the above link is the screw type I was looking for but twice its original length.
Once I get this screw, I will use a hack saw to cut it down to the required length.
I also ordered a metric drill bit to drill a hole for this 4mm screw.
Next week I will be experimenting with the metric drill bit and metric screw from amazon.com.
Couple of interesting links on metric measurement system, I came across during my research: