LBH LEGO Brick Height The height of a normal LEGO® brick, not including the bumps on top. By definition, 1 LBH = 1.2 LSS. Therefore, 1 LBH = 9.582 +- 0.0024 mm.

LGDU LEGO Gear Distance Unit The distance two LEGO® gears have to be to mesh well, multiplied by the total number of teeth. By design, 16 LGDU = 1 LSS. Therefore, 1.0 LGDU = 0.4990625 +- 0.000125 mm.

LSS LEGO Stud Spacing The horizontal spacing between adjacent "bumps" on a LEGO® brick. Experimental measurement of carefully constructed long "walls" of long bricks shows that the LSS is 7.985 +- 0.002 mm.

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