I am trying to currently model a few parts for my custom 3D Printer. I have found some flanged lead screw nuts i'm going to use, but i'm having a hard time reading the dimension sheet. Specifically, what does "D4h11" mean? I understand D4 is as per the chart, but what's h11?,


1 Answer 1


h11 is the tolerance range. There's a standard shaft/hole chart based on dimension/tolerance. (sorry about the images, I've searched on google but cannot find everything on the same image).

h11 is applied to shafts, and H11 is for holes.
With your example D4h11 is Ø48mm with tolerance of -0 to -160 microns.
The referenced part can be (48-0,000) = 48mm (máx) or (48-0,160) = 47,84mm(mín)

Shaft/hole chart. Font: WikipediaSource: https://en.wikipedia.org/wiki/IT_Grade

Shaft chart. Font:http://sttechnica.blogspot.com/2011/03/tolerances-iso-tolerances.htmlSource: http://sttechnica.blogspot.com/2011/03/tolerances-iso-tolerances.html

  • $\begingroup$ You should add the source of your image $\endgroup$
    – joojaa
    May 26, 2020 at 5:09
  • $\begingroup$ Sorry joojaa, edited with the sources. I've put on another field (inside of the image I think) $\endgroup$
    – Leafk
    May 26, 2020 at 11:28

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