Böhler (or Boehler) M261 Extra is a precipitation hardening steel grade for plastic molds featuring excellent machinability in the solution annealed and aged condition. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on heat treating and machining. Filing Code: TS-736. Producer or source: Böhler Edelstahl GmbH & Company KG. See also Alloy Digest TS-732, December 2015.