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Bolt Descriptions

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atomicman

Structural
Joined
Mar 12, 2001
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14
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US
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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