BOLTED CONNECTIONS – I - steel-insdag.org
2018-4-12u2002·u2002Black bolts are unfinished and are made of mild steel and are usually of Grade 4.6. Black bolts have adequate strength and ductility when used properly; but while tightening the nut snug tight ('Snug tight' is defined as the tightness that exists when all plies in a joint are in firm contact) will twist off easily if tightened too much.
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