Iso 286 Pdf

| Nominal Size (mm) | H7 (Lower EI) | H7 (Upper ES) | | :--- | :--- | :--- | | Over 3 up to 6 | 0 | +12 | | Over 6 up to 10 | 0 | +15 | | Over 10 up to 18 | 0 | +18 | | Over 18 up to 30 | 0 | +21 | | Over 30 up to 50 | 0 | +25 | | Over 50 up to 80 | 0 | +30 |

Why invest time in finding the ISO 286 PDF? Because it directly affects your bottom line.

Since most engineers need only the tables (not the academic foreword), we have summarized the critical data from the ISO 286 standard. You can bookmark this or copy it into your own ISO 286 reference PDF. iso 286 pdf

The current active version is ISO 286-1:2010 (Part 1). Part 2 provides tables of standard tolerance classes and hole/shaft deviations. Always check the ISO catalog to see if a newer amendment exists.

| Nominal Size (mm) | h6 (Upper es) | h6 (Lower ei) | | :--- | :--- | :--- | | Over 3 up to 6 | 0 | -8 | | Over 6 up to 10 | 0 | -9 | | Over 10 up to 18 | 0 | -11 | | Over 18 up to 30 | 0 | -13 | | Over 30 up to 50 | 0 | -16 | | Over 50 up to 80 | 0 | -19 | | Over 80 up to 120 | 0 | -22 | | Nominal Size (mm) | H7 (Lower EI)

To understand what you will find in an ISO 286 PDF, you must understand three fundamental elements:

  • Tolerance Grade (IT Grade): A number (IT01, IT0, IT1... IT16) that indicates the level of precision. A smaller number means a tighter tolerance.

    • An exhaustive list of tolerance values (in micrometers or millimeters) for basic sizes ranging from 0 mm up to 3150 mm (often broken into steps). Tolerance Grade (IT Grade): A number (IT01, IT0, IT1

    A car wheel bearing must be an interference fit in the hub (so it doesn't spin) but a clearance fit on the axle (so it can spin). An engineer uses ISO 286 to specify Ø72 P7 (hole in the hub) and Ø72 h6 (shaft of the axle). Without the PDF tables, the factory would produce parts that seize or rattle.