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Case studies
Housing tolerances and resultant fits

Housing tolerances and resultant fits

Housing Nominal bore diameter		Bearing Outside diameter tolerance		Housing bore diameter deviations, resultant fits¹⁾ Tolerance classes
D		t_ΔDmp		N6Ⓔ		N7Ⓔ		P6Ⓔ		P7Ⓔ
				Deviations (housing bore diameter)
				Theoretical interference (–)/clearance (+)
over	incl.	low	high	Probable interference (–)/clearance (+)
mm		µm		µm

6	10	0	–8	–16	–7	–19	–4	–21	–12	–24	–9
				–16	+1	–19	+4	–21	–4	–24	–1
				–14	–1	–16	+1	–19	–6	–21	–4

10	18	0	–8	–20	–9	–23	–5	–26	–15	–29	–11
				–20	–1	–23	+3	–26	–7	–29	–3
				–18	–3	–20	0	–24	–9	–26	–6

18	30	0	–9	–24	–11	–28	–7	–31	–18	–35	–14
				–24	–2	–28	+2	–31	–9	–35	–5
				–21	–5	–25	–1	–28	–12	–32	–8

30	50	0	–11	–28	–12	–33	–8	–37	–21	–42	–17
				–28	–1	–33	+3	–37	–10	–42	–6
				–25	–4	–29	–1	–34	–13	–38	–10

50	80	0	–13	–33	–14	–39	–9	–45	–26	–51	–21
				–33	–1	–39	+4	–45	–13	–51	–8
				–29	–5	–34	–1	–41	–17	–46	–13

80	120	0	–15	–38	–16	–45	–10	–52	–30	–59	–24
				–38	–1	–45	+5	–52	–15	–59	–9
				–33	–6	–40	0	–47	–20	–54	–14

120	150	0	–18	–45	–20	–52	–12	–61	–36	–68	–28
				–45	–2	–52	+6	–61	–18	–68	–10
				–39	–8	–45	–1	–55	–24	–61	–17

150	180	0	–25	–45	–20	–52	–12	–61	–36	–68	–28
				–45	+5	–52	+13	–61	–11	–68	–3
				–38	–2	–44	+5	–54	–18	–60	–11

180	250	0	–30	–51	–22	–60	–14	–70	–41	–79	–33
				–51	+8	–60	+16	–70	–11	–79	–3
				–43	0	–50	+6	–62	–19	–69	–13

250	315	0	–35	–57	–25	–66	–14	–79	–47	–88	–36
				–57	+10	–66	+21	–79	–12	–88	–1
				–48	+1	–54	+9	–70	–21	–76	–13

315	400	0	–40	–62	–26	–73	–16	–87	–51	–98	–41
				–62	+14	–73	+24	–87	–11	–98	–1
				–51	+3	–60	+11	–76	–22	–85	–14

400	500	0	–45	–67	–27	–80	–17	–95	–55	–108	–45
				–67	+18	–80	+28	–95	–10	–108	0
				–55	+6	–65	+13	–83	–22	–93	–15

500	630	0	–50	–88	–44	–114	–44	–122	–78	–148	–78
				–88	+6	–114	+6	–122	–28	–148	–28
				–75	–7	–98	–10	–109	–41	–132	–44

630	800	0	–75	–100	–50	–130	–50	–138	–88	–168	–88
				–100	+25	–130	+25	–138	–13	–168	–13
				–83	+8	–108	+3	–121	–30	–146	–35

800	1 000	0	–100	–112	–56	–146	–56	–156	–100	–190	–100
				–112	+44	–146	+44	–156	0	–190	0
				–92	+24	–119	+17	–136	–20	–163	–27

1 000	1 250	0	–125	–132	–66	–171	–66	–186	–120	–225	–120
				–132	+59	–171	+59	–186	+5	–225	+5
				–108	+35	–138	+26	–162	–19	–192	–28

1 250	1 600	0	–160	–156	–78	–203	–78	–218	–140	–265	–140
				–156	+82	–203	+82	–218	+20	–265	+20
				–126	+52	–163	+42	–188	–10	–225	–20

1 600	2 000	0	–200	–184	–92	–242	–92	–262	–170	–320	–170
				–184	+108	–242	+108	–262	+30	–320	+30
				–149	+73	–192	+58	–227	–5	–270	–20

2 000	2 500	0	–250	–220	–110	–285	–110	–305	–195	–370	–195
				–220	+140	–285	+140	–305	+55	–370	+55
				–177	+97	–226	+81	–262	+12	–311	–4

1) Values are valid for most bearings with Normal tolerances. For exceptions, refer to Tolerances and resultant fits.

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