Made in USA O-1 Oil Hardening Drill Rod Letter "I"
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O-1 Tool Steel is a general purpose oil-hardening tool and die steel. Normal care in treatment gives good results in hardening and produces small dimensional changes. It has good abrasion resistance, and sufficient toughness for normal tool and die applications. When compared to a 1 percent carbon steel, O-1 has a machinability rating of 90.


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