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When he started manufacturing gauge blocks in inch sizes in 1912, Johansson's compromise was to manufacture gauge blocks with a nominal size of 25.4 mm (with a reference temperature of 20 degrees Celsius or 68 degrees Fahrenheit), accurate to within a few parts per million of both official definitions.
Metric gauge block set, 112 pcs Another set with 8 pcs, 125 mm - 500 mm Trolley model. 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. Gauge ...
Retainer: used to block movable part to allow the easy transferring of a measurement. The calipers in the diagram show a primary reading on the metric scale of about 2.475 cm (2.4 cm read from the main scale plus about 0.075 cm from the vernier scale).
Mitutoyo America Corporation was formed in 1963 and is headquartered in Aurora, Illinois (just outside Chicago).Mitutoyo America offers the full product line of precision measuring tools, instruments and equipment with a distribution network, training and education classes, software development, and service support to provide a comprehensive metrology organization.
Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block) a precision ground and lapped length measuring standard. It is used as a reference for the setting of measuring equipment used in machine shops , such as micrometers , sine bars , calipers , and dial indicators (when used in an inspection role ).
Because Johansson's blocks were so popular, his blocks became the de facto standard for manufacturers internationally, [32] [33] with other manufacturers of gauge blocks following Johansson's definition by producing blocks designed to be equivalent to his. [34] In 1930, the British Standards Institution adopted an inch of exactly 25.4 mm.
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