Tool Steel Flat Stock Steel Material Width 1 in Thickness 3/64 in Fractional Size 3/64 in x 1 in x 36 in Finish Unfinished Length 36 in Length Tolerance +0.250 to +0.500 in Hardness Scale 177 to 212 BHN Rockwell B88 to 95 Grade O1 Standards ASTM-A681 FED-QQ-T-570 SAE-J-437