|A-2||Air-hardening steel. Replaces O-1 when safer hardening, better dimensional stability, and increased wear-resistance are required. Most widely used in the A series.|
|D-2||High carbon. High Chrome. Ideal grade for maximum production runs. Superior machinability. Excellent wear-resistance, high compressive strength, and deep hardening properties. Most widely used in the D series.|
|O-1||Oil Hardening. Easy to machine. Good abrasion resistance. Most widely used in O series.|
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