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Brick Tolerances

bluemoosebluemoose Member Posts: 1,716
edited April 2011 in Everything else LEGO
Also from the LEGO Ambassador forums, from a discussion about variable brick size tolerances -
"The standard tolerance for the 2x4 plate is as shown in the attached picture.

So with a tolerance difference between max and minimum at 0.08mm you would theoretically be able to make a stack containing 39 bricks equally as high as one with 40 bricks.

And please remember PAB elements are form the same production lot meaning all brick have the same height (or very likely the same height) during a production run the variation of the dimension are very very small maybe only 0,01mm."
An interesting snippet of insight into the production process.


  • rocaorocao Administrator Posts: 4,284
    That is quite interesting; I realize it may not be the case that the minimum and maximum are simultaneously present, but the tolerance is greater than I would have thought.

    What determines how long a production run is?
  • brickmaticbrickmatic Member Posts: 1,071
    Well according to Wikipedia the typical tolerance for injection molding of thermoplastic is 0.20 mm whereas the possible tolerance is 0.05 mm. So the fact that LEGO has a 0.04 mm tolerance is awesome. Anyways, if you're wondering what can go wrong with injection molding plastic, check out this section that describes various plastic defects and what causes them. It shows how challenging it is to get the process right.
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