Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness.

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Shop Gage Blocks. Precision gage blocks are the primary standards vital to dimensional quality control in the manufacture of parts. The four major characteristics that are necessary for a precision gage block are accuracy, surface finish, wear resistance and dimensional stability.

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Gauge blocks and sets are commonly stacked together to make a desired length. Rectangular gauge blocks, also known as Jo blocks, are made of metal or ceramic. They have two opposing faces that are ground flat at an exact distance apart.

Use the Mitutoyo gauge blocks in these sets individually or together to take precise measurements or calibrate your measuring tools. They are often used to mark layouts, align machine components, and check that parts are within tolerance.

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Gauge blocks, also known as slip gauges, are rectangular (also known as Jo blocks) or square blocks (also known as Hoke blocks) of metal or ceramic with two opposing faces that are ground precisely flat and parallel at an exact distance apart.