The plane irons forare made of 3/16" thick A2 tool steel, which means they can hold theiredge longer. The iron is ground to an angle of 25 degrees. The iron is then hardened in a controlled atmosphere to Rc60-62 for wear resistance. The replacement blade # is 12-142.
What is the hardness rating of the iron in the No. 62 Sweetheart Plane (12-137)?
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