ISO-fundamental tolerance series DIN ISO 286

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ISO-Fundamental
Tolerance series

Extract from Part 1
DIN ISO 286

Tolerances in �m

Tol.- Nominal sizes

Grades - > 3 > 6 > 10 > 18 > 30 > 50 > 80 > 120 > 180 > 250 > 315 > 400

IT ... 3 ... 6 ... 10 ... 18 ... 30 ... 50 ... 80 ... 120 ... 180 ... 250 ... 315 ... 400 ... 500

01 0,3 0,4 0,4 0,5 0,6 0,6 0,8 1 1,2 2 2,5 3 4

0 0,5 0,6 0,6 0,8 1 1 1,2 1,5 2 3 4 5 6

1 0,8 1 1 1,2 1,5 1,5 2 2,5 3,5 4,5 6 7 8

2 1,2 1,5 1,5 2 2,5 2,5 3 4 5 7 8 9 10

3 2 2,5 2,5 3 4 4 5 6 8 10 12 13 15

4 3 4 4 5 6 7 8 10 12 14 16 18 20

5 4 5 6 8 9 11 13 15 18 20 23 25 27

6 6 8 9 11 13 16 19 22 25 29 32 36 40

7 10 12 15 18 21 25 30 35 40 46 52 57 63

8 14 18 22 27 33 39 46 54 63 72 81 89 97

9 25 30 36 43 52 62 74 87 100 115 130 140 155

10 40 48 58 70 84 100 120 140 160 185 210 230 250

11 60 75 90 110 130 160 190 220 250 290 320 360 400

12 100 120 150 180 210 250 300 350 400 460 520 570 630

13 140 180 220 270 330 390 460 540 630 720 810 890 970

14 250 300 360 430 520 620 740 870 1000 1150 1300 1400 1550

15 400 480 580 700 840 1000 1200 1400 1600 1850 2100 2300 2500

16 600 750 900 1100 1300 1600 1900 2200 2500 2900 3200 3600 4000

17 1000 1200 1500 1800 2100 2500 3000 3500 4000 4600 5200 5700 6300

18 1400 1800 2200 2700 3300 3900 4600 5400 6300 7200 8100 8900 9700
This ISO Standard represents the basis for a system of nominal dimensions and sizes whereby the table mirrors the calculated values of basic tolerances relating to basic dimensions.

The use of this table is limited to smooth circular cylindrical workpieces or such with two parallel fitting planes or contact areas.

The values attributed to an ISO tolerance grade (IT) specify the tolerance value and hence the tolerance area. With ascending numbers, the size of the tolerance increases.

For identification purposes of the position of the tolerance area in relation to the nominal dimension (zero), the number chosen as tolerance grade IT is preceded by a letter.

Tolerance area H is the most common value for bores. It specifies that the minimum dimension of the bore corresponds to the nominal dimension. The permissible maximum dimension corresponds to the nominal dimension plus the IT "tolerance.

Examples: bore 20 H7 = 20 + 0,021 / 0
min. dimension: 20,000
max. dimension: 20,021 bore 8 H11 = 8 + 0,090 / 0min. dimension: 8,000max. dimension: 8,090

Tol.-	Nominal sizes
Grades	-	> 3	> 6	> 10	> 18	> 30	> 50	> 80	> 120	> 180	> 250	> 315	> 400
IT	... 3	... 6	... 10	... 18	... 30	... 50	... 80	... 120	... 180	... 250	... 315	... 400	... 500

01	0,3	0,4	0,4	0,5	0,6	0,6	0,8	1	1,2	2	2,5	3	4
0	0,5	0,6	0,6	0,8	1	1	1,2	1,5	2	3	4	5	6
1	0,8	1	1	1,2	1,5	1,5	2	2,5	3,5	4,5	6	7	8

2	1,2	1,5	1,5	2	2,5	2,5	3	4	5	7	8	9	10
3	2	2,5	2,5	3	4	4	5	6	8	10	12	13	15
4	3	4	4	5	6	7	8	10	12	14	16	18	20

5	4	5	6	8	9	11	13	15	18	20	23	25	27
6	6	8	9	11	13	16	19	22	25	29	32	36	40
7	10	12	15	18	21	25	30	35	40	46	52	57	63

8	14	18	22	27	33	39	46	54	63	72	81	89	97
9	25	30	36	43	52	62	74	87	100	115	130	140	155
10	40	48	58	70	84	100	120	140	160	185	210	230	250

11	60	75	90	110	130	160	190	220	250	290	320	360	400
12	100	120	150	180	210	250	300	350	400	460	520	570	630
13	140	180	220	270	330	390	460	540	630	720	810	890	970

14	250	300	360	430	520	620	740	870	1000	1150	1300	1400	1550
15	400	480	580	700	840	1000	1200	1400	1600	1850	2100	2300	2500
16	600	750	900	1100	1300	1600	1900	2200	2500	2900	3200	3600	4000

17	1000	1200	1500	1800	2100	2500	3000	3500	4000	4600	5200	5700	6300
18	1400	1800	2200	2700	3300	3900	4600	5400	6300	7200	8100	8900	9700