What do these numbers on the top of these mini linear actuators denote?

Question

I'm building 42082 and there are 4 of these but 3 unique numbers in the tops.

I'm guessing they are serial numbers from machines that made them but I wondered if someone had a better idea.

Alex · Accepted Answer · 2020-03-22 16:36:59Z

10

First two digits represent week of production followed by a year.

20X8 - 20th week of 2018.

These codes used for quality control. LEGO Customer Service may ask you to provide this number if there were an issue with a set or particular part.

Similar code exist on box seals too.

answered Mar 22, 2020 at 16:36

Alex

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1

Why “X8” instead of “18”? What do other years/decades use?
– KRyan
Mar 23, 2020 at 3:44
This is something unknown, probably has some company internal meaning. For example you can find "S" on boxes, "K" on some other parts. I have an old motor base from set of year 2009. It has "J8" for 2008 production year.
– Alex
Mar 23, 2020 at 5:54
1

If they're using multiple letter codes/year they presumably refer to different production lines, or production runs.
– Dan Is Fiddling By Firelight
Mar 23, 2020 at 13:46

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