indicator bolt

indicator bolt

A door bolt which indicates whether a water closet is vacant or occupied.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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There is also a section called "Alternatives to Legacy Tightening Sequence/Pattern." Load validation methods and tools are presented in these sections as well as diagrams of load indicator bolts.
Solving the puzzle of bolted joints: when bolts, flanges, and gaskets don't seem to cooperate, there's a guide that can reveal the solution
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