|   AISI A4, Type Tool Steel  Subcategory: Tool Steel; Metal Close Analogs: AISI A2, AISI A3, AISI A5, AISI A6, AISI A6, AISI A7, AISI A8, AISI A9, AISI A10 Key Words: AISI A4 Tool Steel; UNS T30104, ASTM A681, FED QQ-T-570 Material Notes: Better machinability than most other air-hardened tool steels.
 
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