What is the interference lock offset of a LEGO stud/hole such that it fits snugly into another piece? (i.e. What are the snap mechanism dimensions?) - Quora
The LEGO Brick — The BYU Design Review
What are the dimensions of a LEGO brick? - Bricks
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BrickLink - Part 3001old : LEGO Brick 2 x 4 without Cross Supports [Brick] - BrickLink Reference Catalog