I bought some 4140 today at a steel merchants who specialize in machining steels
Anyway, the guy on the desk said 4140 comes in black and bright which I did not know .
He wandered down a huge warehouse with rows of steel and found some 3/4" 4140 , it is marked a blue colour which is the correct 4140 colour code going by the interalloy chart .
I tried a file test on the 4140 and its not as hard as I thought it would be . I also filed a few grade 8 and unbrako bolts as a comparison and they file down about the same as the 4140 does .
I think he gave me black 4140 as it has a rough finish .
Mike
Anyway, the guy on the desk said 4140 comes in black and bright which I did not know .
He wandered down a huge warehouse with rows of steel and found some 3/4" 4140 , it is marked a blue colour which is the correct 4140 colour code going by the interalloy chart .
I tried a file test on the 4140 and its not as hard as I thought it would be . I also filed a few grade 8 and unbrako bolts as a comparison and they file down about the same as the 4140 does .
I think he gave me black 4140 as it has a rough finish .
Mike
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