Johannsson block
measurement device
Also known as: gauge block
Quick Summary
A Johansson block, also known as a Jo block, is a set of precision measuring blocks. Developed by Swedish mechanical engineer Carl Edvard Johansson, these blocks are made of high-quality steel and are ground to an accuracy of one hundred-thousandth of an inch or better.12
The purpose of Johansson blocks is to be combined in various ways to achieve almost any desired measurement. This system became a fundamental component of 20th-century mass-production techniques, notably used by Henry Ford.2
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