DIN ISO 286 Fundamental Deviation Tables for Tolerance Calculation of Shaft

You will require ISO 286 tolerance and fundamental deviation (FD) table for reading the shaft drawing with deviation symbol and IT grade numbers.

As you know that ISO 286 is an equivalent standard of JIS B 0401, DIN ISO 286, BS EN 20286, CSN EN 20286 so the table will work with those standards as well.

The table is also important for limits and fits calculation using ANSI B 4.2 standard.

 Shaft Size Range (mm) Fundamental Deviation Values (in mm) for FD classes d e f g j5 j6 j7 k* k** m n p 0 to 3 -0.020 -0.014 -0.006 -0.002 -0.002 -0.002 -0.004 0.000 0 0.002 0.004 0.006 3 to 6 -0.030 -0.020 -0.010 -0.004 -0.002 -0.002 -0.004 0.001 0 0.004 0.008 0.012 6 to 10 -0.040 -0.025 -0.013 -0.008 -0.002 -0.002 -0.005 0.001 0 0.006 0.010 0.015 10 to 14 -0.050 -0.032 -0.016 -0.006 -0.003 -0.003 -0.006 0.001 0 0.007 0.012 0.018 14 to 18 -0.050 -0.032 -0.016 -0.006 -0.003 -0.003 -0.006 0.001 0 0.007 0.012 0.018 18 to 24 -0.065 -0.040 -0.020 -0.007 -0.003 -0.003 -0.008 0.002 0 0.008 0.015 0.022 24 to 30 -0.065 -0.040 -0.020 -0.007 -0.003 -0.003 -0.008 0.002 0 0.008 0.015 0.022 30 to 40 -0.080 -0.050 -0.025 -0.009 -0.004 -0.004 -0.010 0.002 0 0.009 0.017 0.026 40 to 50 -0.080 -0.050 -0.025 -0.009 -0.004 -0.004 -0.010 0.002 0 0.009 0.017 0.026 50 to 65 -0.100 -0.060 -0.030 -0.010 -0.005 -0.005 -0.012 0.002 0 0.011 0.020 0.032 65 to 80 -0.100 -0.060 -0.030 -0.010 -0.007 -0.007 -0.012 0.002 0 0.011 0.020 0.032 80 to 100 -0.120 -0.072 -0.036 -0.012 -0.009 -0.009 -0.015 0.003 0 0.013 0.023 0.037 100 to 120 -0.120 -0.072 -0.036 -0.012 -0.009 -0.009 -0.015 0.003 0 0.013 0.023 0.037 120 to 140 -0.145 -0.085 -0.043 -0.014 -0.011 -0.011 -0.018 0.003 0 0.015 0.027 0.043 140 to 160 -0.145 -0.085 -0.043 -0.014 -0.011 -0.011 -0.018 0.003 0 0.015 0.027 0.043 160 to 180 -0.145 -0.085 -0.043 -0.014 -0.011 -0.011 -0.018 0.003 0 0.015 0.027 0.043 180 to 200 -0.170 -0100 -0.050 -0.015 -0.013 -0.013 -0.021 0.004 0 0.017 0.031 0.050 200 to 250 -0.170 -0100 -0.050 -0.015 -0.013 -0.013 -0.021 0.004 0 0.017 0.031 0.050 250 to 315 -0.190 -0.011 -0.056 -0.017 -0.016 -0.016 -0.026 0.004 0 0.020 0.034 0.056 315 to 400 -0.210 -0.125 -0.062 -0.018 -0.018 -0.018 -0.028 0.004 0 0.021 0.037 0.062 400 to 500 -0.230 -0.135 -0.068 -0.020 -0.020 -0.020 -0.032 0.005 0 0.023 0.040 0.068 500 to 630 -0.260 -0.145 -0.076 -0.022 NA NA NA 0 0 0.026 0.044 0.078 630 to 800 -0.290 -0.160 -0.080 -0.024 NA NA NA 0 0 0.030 0.050 0.088 800 to 1000 -0.320 -0.170 -0.086 -0.026 NA NA NA 0 0 0.034 0.056 0.100 1000 to 1250 -0.350 -0.195 -0.098 -0.028 NA NA NA 0 0 0.040 0.066 0.120 1250 to 1600 -0.390 -0.220 -0.110 -0.030 NA NA NA 0 0 0.048 0.078 0.140 1600 to 2000 -0.430 -0.240 -0.120 -0.032 NA NA NA 0 0 0.058 0.092 0.170 2000 to 2500 -0.480 -0.260 -0.130 -0.034 NA NA NA 0 0 0.068 0.110 0.195 2500 to 3150 -0.520 -0.290 -0.145 -0.038 NA NA NA 0 0 0.076 0.135 0.240 d e f g j5 j6 j7 k* k** m n p

k* – Fundamental deviation values of k class for IT grades  IT4, IT5, IT6 and IT7.

k** – Fundamental deviation values of k class EXCEPT for IT grades IT4, IT5, IT6 and IT7.

Fundamental deviation values of h class for all IT grades = 0 (ZERO ).

Fundamental deviation values of j class for all IT grades EXCEPT IT5, IT6, IT7 =

j5, j6, j7 columns of the table indicates the FD values of j class for IT grades 5, 6 and 7 respectively.

ISO 286 fundamental or standard tolerance table for various IT grades and nominal sizes will be shown in next article.

Shibashis Ghosh

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