Cadmium plated hardened steel hex bolt used on many cars of the 1920’s and 1930’s.
Specifically for use on Duesenberg Model J oil pan, 30 required per car.
Material: 4140 Steel, heat treat grade 8
Finish: Cadmium
Thread: 3/8-24
Thread length: .8125
Length under head: 1.125
OAL: 1.431
Hex: .562
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