Steel 5/8-19 nut used to secure the water pump pulley on the water pump shaft of Packard V-12.
Part of the water pump shaft impeller and fan assembly, Packard part numbers 209069, 203293, 221076.
Material: 12L14
Finish: Natural
Thread: 5/8-18
Thread length: .468
OAL: .806
Hex: 1.062
OD: 1.050
ID: .671
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