The Grand Unified Grit Chart

Discussion in 'Maintenance, Tinkering & Embellishment' started by Komitadjie, Jun 13, 2011.

  1. FortyTwoBlades

    FortyTwoBlades Baryonyx walkeri Dealer / Materials Provider

    Mar 8, 2008
    Here's a good chart from well-known industrial giant, Washington Mills comparing ANSI, FEPA F, and JIS standards.
     
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  2. adamlau

    adamlau

    Oct 13, 2002
    That is the same one I reference. Good one!
     
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  3. FortyTwoBlades

    FortyTwoBlades Baryonyx walkeri Dealer / Materials Provider

    Mar 8, 2008
    If anyone knows grit standards, it's them. Probably the most reputable source short of buying copies of the standards from the respective institutes themselves.
     
  4. ca60852012

    ca60852012

    1
    Feb 27, 2015
    Just a question, are the kme gold series diamond stones on this list? Just trying to get my grit progression written down, and make sure it makes sense.
     
  5. adamlau

    adamlau

    Oct 13, 2002
    Going to combine the two charts I tend to reference most frequently in this post:

    Note: The Washington Mills chart was corrected in the following manner:
    1. Average and Maximum fields for ANSI reversed
    2. Average and Maximum values for ANSI #20 reversed
    Grand Logarithmic Grit Chart v0.93.png
    Grit Size to Micron Comparison Chart.png
     
  6. Littlebabycarrot

    Littlebabycarrot

    56
    Jan 1, 2018
    I have a question regarding the chart... if any helpful fellows could answer it I would be pretty grateful.
    Regarding the compounds listed on the chart (i did check the readme file but may have missed it): are these generic compounds you might get at harbor freight, sears etc? Or a specific manufacturer like Lee Valley, perhaps? Also
    To be sure i have the color code straight Gray compound is at .5 microns and white(?) Is at 1 micron?
    I saw green is listed at around 600 which jibes with what i have seen it listed at when advertised for sale on some sites.... and
    Any info on what abrasives are in the finer compounds would also be appreciated
    Thanks guys
     
  7. Claes

    Claes

    23
    Jan 20, 2006
  8. Littlebabycarrot

    Littlebabycarrot

    56
    Jan 1, 2018
    I was thinking maybe it would be easier if manufacturers were to list the average scratch size left by a particular stone... but i suppose they would need to say which steel at what rockwell hardness it left those scratches on?
     
  9. Littlebabycarrot

    Littlebabycarrot

    56
    Jan 1, 2018
  10. Haffner

    Haffner

    173
    Feb 13, 2007
    Wicked Edge is now selling 1500, 2200 and 3000 grit diamond stones.
     
  11. Haffner

    Haffner

    173
    Feb 13, 2007
    The knivesandtools.com website rates them as similar to a Japanese 3000, 6000 and 8000 grain size.
    But what will they be in terms of microns?
    My guess is 4.5, 2 and 1.2 Micron, but I'm no expert...
     
    Last edited: Feb 4, 2020
  12. Mr.Wizard

    Mr.Wizard

    972
    Feb 28, 2015
  13. Mr.Wizard

    Mr.Wizard

    972
    Feb 28, 2015
    I also wrote to Congress Tools however I asked which grading standard they used and Mark Froelick replied: "Our stone grit is based on the ANSI standard."

    Different measurement methods of the same particles will result in different values but by the modern electrical resistance method in ANSI B74.10 these grit numbers translate to median particle size (d50) as follows:

    150 grit: 63 ~ 107 micron (a B74.12 sieve grade)
    240 grit: 47 ~ 53 micron
    320 grit: 27 ~ 32 micron
    400 grit: 16.5 ~ 20 micron
    600 grit: 9.2 ~ 11.9 micron

    More at https://uama.org/abrasives-101/
     

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