Drill Rod Tool Steel Products: A2 - O1 - W1 - D2 - S7 - M2 ...
O1 Oil-Hardening Drill Rod (A.K.A. 01 Drill Rod) O1 oil-hardening is the most widely used grade of drill rod because of its unique balance of excellent toughness and moderate price. O1 drill rod has a higher alloy content and much better toughness than its water-hardening counterpart.
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