ISO tolerance classes for housings

Housing		Bearing		Housing bore diameter deviations
Nominal bore diameter		Outside diameter tolerance		Tolerance classes1)
D		ΔDmp		H11		H7		J7		K7		M7		N7
over	incl.	max	min	low	high	low	high	low	high	low	high	low	high	low	high
mm		μm		μm
10	18	0	-8	0	+110	0	+18	-8	+10	-12	+6	-18	0	-23	-5
18	30	0	-9	0	+130	0	+21	-9	+12	-15	+6	-21	0	-28	-7
30	50	0	-11	0	+160	0	+25	-11	+14	-18	+7	-25	0	-33	-8
50	80	0	-13	0	+190	0	+30	-12	+18	-21	+9	-30	0	-39	-9
80	120	0	-15	0	+220	0	+35	-13	+22	-25	+10	-35	0	-45	-10
120	150	0	-18	0	+250	0	+40	-14	+26	-28	+12	-40	0	-52	-12
150	180	0	-25	0	+250	0	+40	-14	+26	-28	+12	-40	0	-52	-12
180	250	0	-30	0	+290	0	+46	-16	+30	-33	+13	-46	0	-60	-14
250	315	0	-35	0	+320	0	+52	-16	+36	-36	+16	-52	0	-66	-14
315	400	0	-40	0	+360	0	+57	-18	+39	-40	+17	-57	0	-73	-16
400	500	0	-45	0	+400	0	+63	-20	+43	-45	+18	-63	0	-80	-17
500	630	0	-50	0	+440	0	+70	-	-	-70	0	-96	-26	-114	-44
630	800	0	-75	0	+500	0	+80	-	-	-80	0	-110	-30	-130	-50
800	1 000	0	-100	0	+560	0	+90	-	-	-90	0	-124	-34	-146	-56
1 000	1 250	0	-125	0	+660	0	+105	-	-	-105	0	-145	-40	-171	-66
1 250	1 600	0	-160	0	+780	0	+125	-	-	-125	0	-173	-48	-203	-78
1 600	2 000	0	-200	0	+920	0	+150	-	-	-150	0	-208	-58	-242	-92

The symbols used in the tolerance table are explained in the following:

D	=	nominal housing bore diameter
ΔDmp	=	deviation of the mean outside diameter from the nominal in a single plane

1. 1) All ISO tolerance classes are valid with the envelope requirement (such as H7) in accordance with ISO 14405-1:2010.