Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are precision-ground and lapped blocks of metal, ceramic, or other material used as a length standard. They are used for calibrating measuring equipment and tooling, and for setting up precision machining operations. They are manufactured to specific tolerances and are available in sets of various sizes, allowing them to be combined to create a wide range of desired lengths with very high accuracy.
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