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2. Nail (fastener) - Wikipedia

   en.wikipedia.org/wiki/Nail_(fastener)

   These nails were known as cut nails because they were produced by cutting iron bars into rods; they were also known as square nails because of their roughly rectangular cross section. The cut-nail process was patented in the U.S. by Jacob Perkins in 1795 and in England by Joseph Dyer, who set up machinery in Birmingham. The process was designed ...

3. Marking gauge - Wikipedia

   en.wikipedia.org/wiki/Marking_gauge

   A marking gauge, also known as a scratch gauge, [1] is used in woodworking and metalworking to mark out lines for cutting or other operations. [2] The purpose of the gauge is to scribe a line parallel to a reference edge or surface. It is used in joinery and sheetmetal operations.

4. Rail fastening system - Wikipedia

   en.wikipedia.org/wiki/Rail_fastening_system

   Rusted cut spikes (scale in inches) Dog spike. A rail spike (also known as a cut spike or crampon) is a large nail with an offset head that is used to secure rails and base plates to railroad ties (sleepers) in the track. Robert Livingston Stevens is credited with the invention of the rail spike, [6] the first recorded use of which was in 1832. [7]

5. Go/no-go gauge - Wikipedia

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

   Hardened and ground plug gauge Replaceable thread and plug gauges. These gauges are referred to as plug gauges; they are used in the manner of a plug.They are generally assembled from standard parts, where the gauge portion is interchangeable with other gauge pieces (obtained from a set of pin type gauge blocks) and a body that uses the collet principle to hold the gauges firmly.

6. Gauge (instrument) - Wikipedia

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

   The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction. Ring gauge: a cylindrical ring of steel whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object. Strain gauge

7. 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.

8. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   The Birmingham gauge is also known as the Stubs Iron Wire Gauge or Birmingham Wire Gauge and is distinct from the Stubs Steel Wire Gauge and the British Standard Wire Gauge. It is commonly referred to simply as gauge (abbreviated as G ), [ 3 ] but this should not be confused with the French gauge , a separate system used for measuring the outer ...

9. Snap gauge - Wikipedia

   en.wikipedia.org/wiki/Snap_gauge

   Snap go/no go gauge and indicator snap gauge. A snap gauge is a form of go/no go gauge.It is a limit gauge with permanently or temporarily fixed measurement aperture(s) (gaps) which is used to quickly verify whether an outside dimension of a part matches a preset dimension or falls within predefined tolerances.