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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.

 

ISO 286 fundamental deviation table of most widely used FD classes for the shafts up to 3150 mm diameter: 
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 =

IT grade value /2000.

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.

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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. )

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