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Bolt Descriptions

Bolt Descriptions

Bolt Descriptions

(OP)
Sorry if this is a basic question for most of you, but I am confused by some terminology I have come across in some plans.  "Economy Bolts" are called out for a connection.  What is the definition of "economy bolt"?  Does it conform to ASTM A 307 or some other specification?  Can it be either square, hex, or round headed?

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