Bearings Internal Clearance

Radial internal clearance is a measure of the radial looseness, or play between the inner and outer rings. Precision bearings are available in five classes of looseness. The amount of looseness necessary is dependent on many factors such as shaft alignment shaft and housing fits, bearing speed,etc.

Radial Internal Clearance Chart

unit:um

Bore Diameter		C-2		Standard		C-3		C-4		C-5
Over	Incl.	Low	High	Low	High	Low	High	Low	High	Low	High
2.5	6	0	8	2	13	8	23
6	10	0	8	2	13	8	23	14	29	20	37
10	18	0	8	3	18	11	25	18	33	25	45
18	24	0	10	5	20	13	28	20	36	28	48
24	30	1	11	5	20	13	28	23	41	30	53
30	40	1	11	6	20	15	33	28	46	40	64
40	50	1	11	6	23	18	36	30	51	45	73
50	65	1	15	8	28	23	43	38	61	55	90
65	80	1	15	10	30	25	51	46	71	65	105