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Lag screws, also sometimes called lag bolts, are basically "large wood screws". Square lag screws and hex lag screws are covered by ASME B18.2.1. The head is typically an external hex. The materials are usually carbon steel substrate with a coating of zinc galvanization (for corrosion resistance). The zinc coating may be bright (electroplated), yellow (electroplated), or dull gray hot-dip galvanized. Lag bolts are used to lag together lumber framing, to lag machinery feet to wood floors, and other heavy carpentry applications. (Quote from Wikipedia)
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