Dimensions - clearance

The geometry of the bearing should be calculated according to the figure. The tolerance band for the bearing inside diameter is shown in the table below. Operating temperature and bearing load are decisive factors in the choice of clearance class.
The values in the table are based on a shaft tolerance h7 (h6, h8).
For application involving operating temperature above 150°C please contact Johnson Metall AB, whose engineers will help you.

The figures in the column headed "After fitting" refer to the resulting dimensions if the outside diameter of the bearing is manufactured with a tolerance of r7. The bearing clearance can be calculated from the table values considering a shaft tolerance of h7. Making a decision is a complex operation: if you have a problem or would like some guidance, do not hesitate to contact Johnson Metall AB, whose tribologists will be pleased to help you.

Bearing

The bearing is chamfered as shown.

Tolerances for inside diameter d

Bearing inside diameter d mm	Class 1 Special case Small clearance
	Manufacture		After fitting
	Upper+	Lower+	Upper+	Lower+
–10	70	55	60	40
(10) –18	80	60	70	40
(18) –30	100	80	90	50
(30) –50	130	105	120	70
(50) –80	175	145	150	100
(80) –120	220	185	190	140
(120) –180	270	230	250	170
(180) –250	325	280	280	200
(250) –315	390	340	330	250
(315) –400	460	405	390	300
(400) –500	545	480	460	360
Bearing inside diameter d mm	Class 2 Normal applications Temperature <150°C
	Manufacture		After fitting
	Upper+	Lower+	Upper+	Lower+
–10	85	70	80	50
(10) –18	130	110	120	90
(18) –30	175	155	170	130
(30) –50	235	210	220	180
(50) –80	295	265	280	230
(80) –120	365	330	340	280
(120) –180	440	400	420	340
(180) –250	530	480	480	400
(250) –315	615	560	560	470
(315) –400	700	640	630	540
(400) –500	800	735	720	620
Bearing inside diameter d mm	Class 3 For high temp. 300°C Heavy load <50N/mm2
	Manufacture		After fitting
	Upper+	Lower+	Upper+	Lower+
–10	110	95	100	80
(10) –18	165	145	160	130
(18) –30	230	210	220	180
(30) –50	305	280	290	250
(50) –80	405	370	390	330
(80) –120	515	480	490	430
(120) –180	625	585	590	520
(180) –250	740	695	690	610
(250) –315	860	805	810	730
(315) –400	980	925	920	820
(400) –500	1105	1040	1030	920