What is the H7 tolerance for a 10 mm hole?

0 to +15 µm, so the hole measures 10.000 to 10.015 mm. 10 mm falls in the range over 6 up to 10 mm.

What is the difference between H7 and h7?

H7 is a hole tolerance, from the nominal size upwards. h7 is a shaft tolerance, from the nominal size downwards. Both have the width of IT7.

Is H7/g6 a clearance fit?

Yes. The smallest H7 hole is still larger than the largest g6 shaft, so there is always some clearance, 7 to 41 µm at 25 mm.

H7 tolerance and ISO 286 fits: tables and fit calculator

Limits of the common ISO hole and shaft classes from 0 to 500 mm, the IT grades, and a calculator that gives the clearance or interference of a fit such as H7/g6.

ISO 286 fit calculator

Nominal size (mm) Hole Shaft

H7 tolerance table and other hole classes (µm)

Nominal size (mm)	H6	H7	H8	H9	H11	G7	JS7	K7	M7	N7	P7
up to 3	+6 / 0	+10 / 0	+14 / 0	+25 / 0	+60 / 0	+12 / +2	–	–	–	–	–
3 – 6	+8 / 0	+12 / 0	+18 / 0	+30 / 0	+75 / 0	+16 / +4	+6 / -6	+3 / -9	0 / -12	-4 / -16	-8 / -20
6 – 10	+9 / 0	+15 / 0	+22 / 0	+36 / 0	+90 / 0	+20 / +5	+7.5 / -7.5	+5 / -10	0 / -15	-4 / -19	-9 / -24
10 – 18	+11 / 0	+18 / 0	+27 / 0	+43 / 0	+110 / 0	+24 / +6	+9 / -9	+6 / -12	0 / -18	-5 / -23	-11 / -29
18 – 30	+13 / 0	+21 / 0	+33 / 0	+52 / 0	+130 / 0	+28 / +7	+10.5 / -10.5	+6 / -15	0 / -21	-7 / -28	-14 / -35
30 – 50	+16 / 0	+25 / 0	+39 / 0	+62 / 0	+160 / 0	+34 / +9	+12.5 / -12.5	+7 / -18	0 / -25	-8 / -33	-17 / -42
50 – 80	+19 / 0	+30 / 0	+46 / 0	+74 / 0	+190 / 0	+40 / +10	+15 / -15	+9 / -21	0 / -30	-9 / -39	-21 / -51
80 – 120	+22 / 0	+35 / 0	+54 / 0	+87 / 0	+220 / 0	+47 / +12	+17.5 / -17.5	+10 / -25	0 / -35	-10 / -45	-24 / -59
120 – 180	+25 / 0	+40 / 0	+63 / 0	+100 / 0	+250 / 0	+54 / +14	+20 / -20	+12 / -28	0 / -40	-12 / -52	-28 / -68
180 – 250	+29 / 0	+46 / 0	+72 / 0	+115 / 0	+290 / 0	+61 / +15	+23 / -23	+13 / -33	0 / -46	-14 / -60	-33 / -79
250 – 315	+32 / 0	+52 / 0	+81 / 0	+130 / 0	+320 / 0	+69 / +17	+26 / -26	+16 / -36	0 / -52	-14 / -66	-36 / -88
315 – 400	+36 / 0	+57 / 0	+89 / 0	+140 / 0	+360 / 0	+75 / +18	+28.5 / -28.5	+17 / -40	0 / -57	-16 / -73	-41 / -98
400 – 500	+40 / 0	+63 / 0	+97 / 0	+155 / 0	–	–	–	+18 / -45	0 / -63	-17 / -80	-45 / -108

Shaft tolerances: h7, h6, g6 and other classes (µm)

Nominal size (mm)	f7	g6	h6	h7	h9	h11	js6	k6	m6	n6	p6	r6	s6
up to 3	-6 / -16	-2 / -8	0 / -6	0 / -10	0 / -25	–	–	+6 / 0	+8 / +2	+10 / +4	+12 / +6	+16 / +10	+20 / +14
3 – 6	-10 / -22	-4 / -12	0 / -8	0 / -12	0 / -30	0 / -75	+4 / -4	+9 / +1	+12 / +4	+16 / +8	+20 / +12	+23 / +15	+27 / +19
6 – 10	-13 / -28	-5 / -14	0 / -9	0 / -15	0 / -36	0 / -90	+4.5 / -4.5	+10 / +1	+15 / +6	+19 / +10	+24 / +15	+28 / +19	+32 / +23
10 – 18	-16 / -34	-6 / -17	0 / -11	0 / -18	0 / -43	0 / -110	+5.5 / -5.5	+12 / +1	+18 / +7	+23 / +12	+29 / +18	+34 / +23	+39 / +28
18 – 30	-20 / -41	-7 / -20	0 / -13	0 / -21	0 / -52	0 / -130	+6.5 / -6.5	+15 / +2	+21 / +8	+28 / +15	+35 / +22	+41 / +28	+48 / +35
30 – 50	-25 / -50	-9 / -25	0 / -16	0 / -25	0 / -62	0 / -160	+8 / -8	+18 / +2	+25 / +9	+33 / +17	+42 / +26	+50 / +34	+59 / +43
50 – 80	-30 / -60	-10 / -29	0 / -19	0 / -30	0 / -74	0 / -190	+9.5 / -9.5	+21 / +2	+30 / +11	+39 / +20	+51 / +32	–	–
80 – 120	-36 / -71	-12 / -34	0 / -22	0 / -35	0 / -87	0 / -220	+11 / -11	+25 / +3	+35 / +13	+45 / +23	+59 / +37	–	–
120 – 180	-43 / -83	-14 / -39	0 / -25	0 / -40	0 / -100	0 / -250	+12.5 / -12.5	+28 / +3	+40 / +15	+52 / +27	+68 / +43	–	–
180 – 250	-50 / -96	-15 / -44	0 / -29	0 / -46	0 / -115	0 / -290	+14.5 / -14.5	+33 / +4	+46 / +17	+60 / +31	+79 / +50	–	–
250 – 315	-56 / -108	-17 / -49	0 / -32	0 / -52	0 / -130	–	+16 / -16	+36 / +4	+52 / +20	+66 / +34	+88 / +56	–	–
315 – 400	-62 / -119	-18 / -54	0 / -36	0 / -57	0 / -140	–	+18 / -18	+40 / +4	+57 / +21	+73 / +37	+98 / +62	–	–
400 – 500	-68 / -131	-20 / -60	0 / -40	0 / -63	–	–	–	+45 / +5	+63 / +23	+80 / +40	+108 / +68	–	–

r6 and s6 above 50 mm (µm)

Nominal size (mm)	r6	s6
50 – 65	+60 / +41	+72 / +53
65 – 80	+62 / +43	+78 / +59
80 – 100	+73 / +51	+93 / +71
100 – 120	+76 / +54	+101 / +79
120 – 140	+88 / +63	+117 / +92
140 – 160	+90 / +65	+125 / +100
160 – 180	+93 / +68	+133 / +108
180 – 200	+106 / +77	+151 / +122
200 – 225	+109 / +80	+159 / +130
225 – 250	+113 / +84	+169 / +140
250 – 280	+126 / +94	+190 / +158
280 – 315	+130 / +98	+202 / +170
315 – 355	+144 / +108	+226 / +190
355 – 400	+150 / +114	+244 / +208
400 – 450	+166 / +126	+272 / +232
450 – 500	+172 / +132	+292 / +252

Upper / lower deviation in micrometres from the nominal size. A dash means fewer than two independent sources gave that value.

ISO 286 IT grades: standard tolerances IT1 to IT16 (µm)

Nominal size (mm)	IT1	IT2	IT3	IT4	IT5	IT6	IT7	IT8	IT9	IT10	IT11	IT12	IT13	IT14	IT15	IT16
up to 3	0.8	1.2	2	3	4	6	10	14	25	40	60	100	140	250	400	600
3 – 6	1	1.5	2.5	4	5	8	12	18	30	48	75	120	180	300	480	750
6 – 10	1	1.5	2.5	4	6	9	15	22	36	58	90	150	220	360	580	900
10 – 18	1.2	2	3	5	8	11	18	27	43	70	110	180	270	430	700	1,100
18 – 30	1.5	2.5	4	6	9	13	21	33	52	84	130	210	330	520	840	1,300
30 – 50	1.5	2.5	4	7	11	16	25	39	62	100	160	250	390	620	1,000	1,600
50 – 80	2	3	5	8	13	19	30	46	74	120	190	300	460	740	1,200	1,900
80 – 120	2.5	4	6	10	15	22	35	54	87	140	220	350	540	870	1,400	2,200
120 – 180	3.5	5	8	12	18	25	40	63	100	160	250	400	630	1,000	1,600	2,500
180 – 250	4.5	7	10	14	20	29	46	72	115	185	290	460	720	1,150	1,850	2,900
250 – 315	6	8	12	16	23	32	52	81	130	210	320	520	810	1,300	2,100	3,200
315 – 400	7	9	13	18	25	36	57	89	140	230	360	570	890	1,400	2,300	3,600
400 – 500	8	10	15	20	27	40	63	97	155	250	400	630	970	1,550	2,500	4,000

Sources the values were checked against (10)

H7 tolerance in mm

H7 is the most used hole tolerance: its lower limit is the nominal size and its upper limit is the nominal size plus the IT7 grade. For a 25 mm hole that is 25.000 to 25.021 mm. The H7 column of the hole table gives the upper deviation for every size range; the lower one is always zero.

A shaft in h7 is the mirror image: its upper limit is the nominal size and it can be up to IT7 smaller, 24.979 to 25.000 mm at 25 mm.

H7/g6, H7/h6, H7/k6 and H7/p6 fits

With the hole kept at H7, the shaft class decides the fit. At 25 mm:

H7/g6 is a close running fit: the shaft is 7 to 20 µm under size, so the clearance is 7 to 41 µm.
H7/h6 is a locating clearance fit, from 0 to 34 µm of clearance.
H7/k6 is a transition fit, from 19 µm of clearance to 15 µm of interference.
H7/p6 is an interference fit, from 1 to 35 µm of interference, used for pressed-in bushes and pins.

The calculator above does the same for any size and any pair of classes in the tables.

ISO 286 tolerance limits: how they are built

Each class is a letter and a number. The letter is the fundamental deviation, the position of the zone relative to the nominal size; the number is the IT grade, its width. Capital letters are holes and small letters shafts. The tables here give the resulting limits directly for the common classes, checked against at least two independent sources each, so no further calculation is needed.

H7 tolerance and fits: common questions

What is the H7 tolerance for a 10 mm hole?: 0 to +15 µm, so the hole measures 10.000 to 10.015 mm. 10 mm falls in the range over 6 up to 10 mm.
What is the difference between H7 and h7?: H7 is a hole tolerance, from the nominal size upwards. h7 is a shaft tolerance, from the nominal size downwards. Both have the width of IT7.
Is H7/g6 a clearance fit?: Yes. The smallest H7 hole is still larger than the largest g6 shaft, so there is always some clearance, 7 to 41 µm at 25 mm.