measuring up cheap blades rockwell hardness

Discussion in 'Lawn Mowing' started by rodney, Mar 6, 2002.

  1. rodney

    rodney LawnSite Member
    from sw,ohio
    Messages: 103

    metal hardness is measured in rockwell hardness units , and the hardness of a blade ranges from 35 on the low end to 50 on the high end some blades may go higher. example is stens carbide tongsten blade has a hardness of 65.
    the higher the hardness value the longer the blade will retain a decent edge .
    you pay more for harder blades but you pay even more for the cheaper blades , by spending more time shapening and replacing them.

    i fond this in grounds maintenance magizine.

    so i whent to the barn to get some blades to see what thy are and couldnt find but one blade out of greatdane ,lawnboy, toro and snapper that has a two didgit number. the snapper has a square box next to the numbers 80k .

    is this rite do they make them that hard and why are the other blades not marked ?
  2. ceaman

    ceaman LawnSite Member
    from Indiana
    Messages: 131

    That is not the rockwell hardness, I guarantee it.

    The abbreviation for rockwell hardness would be something like 50Rc which states that it is "50 on the rockwell C scale".
  3. longslawn

    longslawn LawnSite Member
    Messages: 201

    I agree with ceaman. I worked as a machinist for 16 years and if the blade was 65 rockwell it would be very dangerous to use. I once tested a John Deere blade and the Rc was 26. I would think that most blades were this or less.
    We worked with tool steel and only got rockwells of 62-68.
    I don't think the blade steel is of tool quality and could not reach these Rc numbers. It could be case hardend, but I dought it. It would be a pain to sharpen a 65 C blade.
  4. shadetree

    shadetree LawnSite Member
    Messages: 7

    Silver Streak has a number of blades that are now rc50.
    I use their Gator magnum rc50 and have very good luck with them.

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