Tolerances for solid steel shafts - seats for radial roller bearings1)

Conditions	Shaft diameter	Dimensional tolerance²⁾	Total radial run-out tolerance³⁾	Total axial run-out tolerance³⁾	Ra
	mm	–	–	–	µm

Rotating inner ring load or direction of load indeterminate
Light loads (P ≤ 0,05 C)	≤ 25	j6	IT5/2	IT5	0,8
	> 25 to 60	k6	IT5/2	IT5	0,8
	> 60 to 140	m6	IT5/2	IT5	0,8

Normal to heavy loads (0,05 C < P ≤ 0,1 C)	≤ 30	k6	IT5/2	IT5	0,8
	> 30 to 50	m5	IT5/2	IT5	0,8
	> 50 to 65	n5	IT5/2	IT5	0,8
	> 65 to 100	n6	IT5/2	IT5	0,8
	> 100 to 280	p6	IT5/2	IT5	1,6
	> 280 to 500	r6	IT5/2	IT5	1,6
	> 500	r7	IT6/2	IT6	3,2

Heavy to very heavy loads and high peak loads under difficult operating conditions (P > 0,1 C)	> 50 to 65	n5	IT5/2	IT5	0,8
	> 65 to 85	n6	IT5/2	IT5	0,8
	> 85 to 140	p6	IT5/2	IT5	0,8
	> 140 to 300	r6	IT5/2	IT5	1,6
	> 300 to 500	r6 + IT6⁴⁾	IT5/2	IT5	1,6
	> 500	r7 + IT7⁴⁾	IT6/2	IT6	3,2

Stationary inner ring load
Easy axial displacement of inner ring on shaft desirable		g6⁵⁾	IT5/2	IT5	1,6
Easy axial displacement of inner ring on shaft unnecessary		h6	IT5/2	IT5	1,6

Axial loads only		j6	IT5/2	IT5	1,6

1) For needle roller bearings → relevant sections under Needle roller bearings.
2) Envelope requirement (symbol Ⓔ from ISO 14405-1) not written but applies.
3) Values listed are for bearings to Normal tolerances. For bearings with tighter tolerance classes, use the recommendations in this table.
4) Shifted tolerance field.
5) Depending on bearing size, a shifted g6Ⓔ tolerance may be needed to obtain a loose fit.

Support/Inquiries