Blog

DIN ISO 286 Standard Tolerance Zone Size Table for Different IT Grades and Nominal Size

Reading the drawings with fundamental deviation (FD) symbols (like g, h or G, H etc) and IT grades will require ISO FD table and DIN ISO 286 fundamental or standard tolerance table.

By the way, the ISO 286 standard is equivalent to other national and international similar standards like JIS B 0401, BS EN 20286, CSN EN 20286, so, the table will remain valid for the other standards also.

 

 

Table showing the values of standard tolerances (length of the tolerance zones) for different IT grades and nominal size(All in mm)
Nominal Size Range IT5 IT6 IT7 IT8 IT9 IT10 IT11
0 to 3 0.004 0.006 0.010 0.014 0.025 0.040 0.060
3 to 6 0.005 0.008 0.012 0.018 0.030 0.048 0.075
6 to 10 0.006 0.009 0.015 0.022 0.036 0.058 0.090
10 to 18 0.008 0.011 0.018 0.027 0.043 0.070 0.110
18 to 30 0.009 0.013 0.021 0.033 0.052 0.084 0.130
30 to 50 0.011 0.016 0.025 0.039 0.062 0.100 0.160
50 to 80 0.013 0.019 0.030 0.046 0.074 0.120 0.190
80 to 120 0.015 0.022 0.035 0.054 0.087 0.140 0.220
120 to 180 0.018 0.025 0.040 0.063 0.100 0.160 0.250
180 to 250 0.020 0.029 0.046 0.072 0.115 0.185 0.290
250 to 315 0.023 0.032 0.052 0.081 0.130 0.210 0.320
315 to 400 0.025 0.036 0.057 0.089 0.140 0.230 0.360
400 to 500 0.027 0.040 0.063 0.097 0.155 0.250 0.400
500 to 630 0.032 0.044 0.070 0.110 0.175 0.280 0.440
630 to 800 0.036 0.050 0.080 0.125 0.200 0.320 0.500
800 to 1000 0.040 0.056 0.090 0.140 0.230 0.360 0.560
1000 to 1250 0.047 0.066 0.105 0.165 0.260 0.420 0.660
1250 to 1600 0.055 0.078 0.125 0.195 0.310 0.500 0.780
1600 to 2000 0.065 0.092 0.150 0.230 0.370 0.600 0.920
2000 to 2500 0.078 0.110 0.175 0.280 0.440 0.700 1.100
2500 to 3150 0.096 0.135 0.210 0.330 0.540 0.860 1.350
  IT5 IT6 IT7 IT8 IT9 IT10 IT11

The tolerance zone length values from the above ISO tolerance table will be required for calculating the lower and upper tolerance value of shaft or hole drawings.

Tags:

Shibashis Ghosh

Hi, I am Shibashis, a blogger by passion and an engineer by profession. I have written most of the articles for mechGuru.com. For more than a decades i am closely associated with the engineering design/manufacturing simulation technologies. I am a self taught code hobbyist, presently in love with Python (Open CV / ML / Data Science /AWS -3000+ lines, 400+ hrs. )

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.