z6 tolerance (shaft, IT6)
Shaft tolerance class z6 per ISO 286-1:2010: fundamental deviation ei +26 … +1250, grade IT6 (6 µm at ≤ 3 mm to 40 µm at 400–500 mm). For an exact size, open the calculator with z6 selected.
- Type
- Shaft
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- ei +26 … +1250 µm
z6 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +32 | +26 | 3.032 | 3.026 | +0.032 | +0.026 | +0.00126 / +0.00102 |
| 3 – 6 | +43 | +35 | 6.043 | 6.035 | +0.043 | +0.035 | +0.00169 / +0.00138 |
| 6 – 10 | +51 | +42 | 10.051 | 10.042 | +0.051 | +0.042 | +0.00201 / +0.00165 |
| 10 – 14 | +61 | +50 | 14.061 | 14.050 | +0.061 | +0.050 | +0.00240 / +0.00197 |
| 14 – 18 | +71 | +60 | 18.071 | 18.060 | +0.071 | +0.060 | +0.00280 / +0.00236 |
| 18 – 24 | +86 | +73 | 24.086 | 24.073 | +0.086 | +0.073 | +0.00339 / +0.00287 |
| 24 – 30 | +101 | +88 | 30.101 | 30.088 | +0.101 | +0.088 | +0.00398 / +0.00346 |
| 30 – 40 | +128 | +112 | 40.128 | 40.112 | +0.128 | +0.112 | +0.00504 / +0.00441 |
| 40 – 50 | +152 | +136 | 50.152 | 50.136 | +0.152 | +0.136 | +0.00598 / +0.00535 |
| 50 – 65 | +191 | +172 | 65.191 | 65.172 | +0.191 | +0.172 | +0.00752 / +0.00677 |
| 65 – 80 | +229 | +210 | 80.229 | 80.210 | +0.229 | +0.210 | +0.00902 / +0.00827 |
| 80 – 100 | +280 | +258 | 100.280 | 100.258 | +0.280 | +0.258 | +0.01102 / +0.01016 |
| 100 – 120 | +332 | +310 | 120.332 | 120.310 | +0.332 | +0.310 | +0.01307 / +0.01220 |
| 120 – 140 | +390 | +365 | 140.390 | 140.365 | +0.390 | +0.365 | +0.01535 / +0.01437 |
| 140 – 160 | +440 | +415 | 160.440 | 160.415 | +0.440 | +0.415 | +0.01732 / +0.01634 |
| 160 – 180 | +490 | +465 | 180.490 | 180.465 | +0.490 | +0.465 | +0.01929 / +0.01831 |
| 180 – 200 | +549 | +520 | 200.549 | 200.520 | +0.549 | +0.520 | +0.02161 / +0.02047 |
| 200 – 225 | +604 | +575 | 225.604 | 225.575 | +0.604 | +0.575 | +0.02378 / +0.02264 |
| 225 – 250 | +669 | +640 | 250.669 | 250.640 | +0.669 | +0.640 | +0.02634 / +0.02520 |
| 250 – 280 | +742 | +710 | 280.742 | 280.710 | +0.742 | +0.710 | +0.02921 / +0.02795 |
| 280 – 315 | +822 | +790 | 315.822 | 315.790 | +0.822 | +0.790 | +0.03236 / +0.03110 |
| 315 – 355 | +936 | +900 | 355.936 | 355.900 | +0.936 | +0.900 | +0.03685 / +0.03543 |
| 355 – 400 | +1036 | +1000 | 401.036 | 401.000 | +1.036 | +1.000 | +0.04079 / +0.03937 |
| 400 – 450 | +1140 | +1100 | 451.140 | 451.100 | +1.140 | +1.100 | +0.04488 / +0.04331 |
| 450 – 500 | +1290 | +1250 | 501.290 | 501.250 | +1.290 | +1.250 | +0.05079 / +0.04921 |
Deviations at the upper end of each range (Ø columns use that size); use the calculator for the exact size. — : not defined by ISO 286 for that size. Upper/Lower (mm) and inch columns are shown on wider screens.
About z6
z6 denotes a shaft tolerance zone with heavy interference deviation in the ISO 286 system.
At Ø25 mm z6 is +0.101 / +0.088 mm, i.e. 25.088 to 25.101 mm.
How the limits are calculated
z6 uses grade IT6 (a standard tolerance of 13 µm at 18–30 mm). Fundamental deviation: ei is tabulated directly by ISO 286-1 Table 2; es = ei + IT6. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.