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2. Thread pitch gauge - Wikipedia

   en.wikipedia.org/wiki/Thread_pitch_gauge

   A thread gauge, [1] also known as a screw gauge [2] or pitch gauge, [3] is used to measure the pitch or lead of a screw thread. Thread pitch gauges are used as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole. This tool is not used as a precision measuring instrument, rather it allows the user to ...

3. Gauge (instrument) - Wikipedia

   en.wikipedia.org/wiki/Gauge_(instrument)

   Dial indicator, also known as a dial test indicator, dial gauge, or probe indicator an instrument used to accurately measure small linear distances. Feeler gauge: a simple tool used to measure gap widths. Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block) a precision ground and lapped length measuring standard.

4. Center gauge - Wikipedia

   en.wikipedia.org/wiki/Center_gauge

   Two different thread setting gauges. Center gauges and fishtail gauges [1] are gauges used in lathe work for checking the angles when grinding the profiles of single-point screw-cutting tool bits and centers. In the image, the gauge on the left is called a fishtail gauge or center gauge, and the one on the right is another style of center gauge ...

5. Gauge block - Wikipedia

   en.wikipedia.org/wiki/Gauge_block

   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 blocks come in sets of blocks with a range of standard lengths.

6. Go/no-go gauge - Wikipedia

   en.wikipedia.org/wiki/Go/no-go_gauge

   A pair of go and no-go gauges. A go/no-go gauge is an inspection tool used to check a workpiece against its allowed tolerances via a go/no-go test. Its name is derived from two tests: the check involves the workpiece having to pass one test (go) and fail the other (no-go). For example, ISO 1502 sets a standard for screw threads and gauging to ...

7. Micrometer (device) - Wikipedia

   en.wikipedia.org/wiki/Micrometer_(device)

   Pitch-diameter micrometers (aka thread mics) have a matching set of thread-shaped tips for measuring the pitch diameter of screw threads. Limit mics have two anvils and two spindles, and are used like a snap gauge. The part being checked must pass through the first gap and must stop at the second gap in order to be within specification.

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9. Carl Edvard Johansson - Wikipedia

   en.wikipedia.org/wiki/Carl_Edvard_Johansson

   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, accurate to within a few parts per million of both official definitions.