Every Lego brick is molded to a tolerance of about 10 mic... | funfact.wiki | funfact.wiki
Every Lego brick is molded to a tolerance of about 10 micrometers — thinner than a human hair. That precision keeps the defect rate to roughly 18 out of every million bricks produced.
A 2x4 LEGO brick made in 1958 still clicks perfectly onto one made today. LEGO holds manufacturing tolerances as tight as 0.002mm — thinner than a human hair — across the billions of bricks it molds each year, with only about 18 in every million pieces falling outside spec.