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Cast iron is normally threaded. lead is normally embedded. It's because of the need for deeper threading to produce the same strength in lead vs iron.
Iron has enough strength that it can hold with 'normal' bolts, lead would require a very deep thread and wide bearing surface to produce the same.
Similar to the difference between regular wood screws and screws made for use in MDF
Much cheaper/easier to place a 'J' bolt on the mold when casting lead.
Ken.
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