Tap bolt

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a bolt with a head on one end and a thread on the other end, to be screwed into some fixed part, instead of passing through the part and receiving a nut. See Illust. under Bolt.

See also: Tap

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This automated inventory of assets gives a fast, dynamic, combined panorama of all the pieces of infrastructure and parts of the network, such as lanes, tap bolts, railroad ties, markers, signals...