Operating Clearance

Tolerance and operating clearance

The operating clearance of linear bearings is defined by the selection of shaft and housing tolerance, see tables, link.

The operating clearance of linear bearing units is defined either by the shaft or, in the case of slotted housings, is set by means of the adjustment screw.

ACHTUNG

In the case of non-rigid housings, tests must be carried out in order to achieve the required operating clearance by means of the housing and shaft tolerances.

Tolerance and operating clearance

Linear bearings, linear bearing and housing units	Designation	Tolerance		Operating clearance
Linear bearings, linear bearing and housing units	Designation	Shaft	Bore	Operating clearance
Compact range	KH	See table, link
Compact range	KGHK, KTHK	h6	‒	Standard
Light range	KN..-B, KNO..-B	h6	H7	Clearance-free
Heavy duty range	KS, KSO	h6	H7	Clearance-free
	KGSNG, KTSG, KGSNO, KTSO, KGSC, KTFS	h6	‒	Slight preload
	KGSNS, KTSS, KGSNOS, KTSOS, KGSCS	‒	‒	Adjustable by means of screw
Machined range	KB	See table, link
	KBS, KBO	See table, link
	KGB, KGBA, KTB, KGBO, KTBO	h6	‒	See table, link
	KGBS, KGBAS, KGBAO	‒	‒	Adjustable by means of screw
Plain bearing range	PAB, PABO	h7	H7	Standard
Plain bearing range	PAGBA, PAGBAO	h7	‒	Standard

Mounting tolerances and operating clearance

The theoretically possible operating clearance for the individual series is shown in the following tables and ➤ Figure.

Operating clearance for KH, KN..-B, KNO..-B

Mounting tolerance		Operating clearance All sizes
Shaft	Bore	Operating clearance All sizes
h6	H7, K7	Normal operating clearance	Steel/ aluminium
j5	H6, K6	Operating clearance smaller than normal	Steel/ aluminium

Operating clearance for KS, KSO

Mounting tolerance		Size and operating clearance
Shaft	Bore	12	16	20	25	30	40	50
Shaft	Bore	μm	μm	μm	μm	μm	μm	μm
h6	H6	+36–8	+34–10	+37–12	+34–15	+29–20	+33–22	+30–25
h6	H7	+44–8	+42–10	+46–12	+43–15	+38–20	+44–22	+41–25
h6	JS6	+29–14,5	+27,5–16,5	+29–20	+26–23	+21–28	+23,5–31,5	+20,5–34,5

Operating clearance for KB

Mounting tolerance		Size and operating clearance
Shaft	Bore	12	16	20	25	30	40	50
Shaft	Bore	μm	μm	μm	μm	μm	μm	μm
h6	H6 (H7)	+190	+20–1	+22–1	+24–1	+24–1	+29–2	+29–2

Operating clearance for KBS, KBO

Mounting tolerance		Size and operating clearance
Shaft	Bore	12	16	20	25	30	40	50
Shaft	Bore	μm	μm	μm	μm	μm	μm	μm
h6	H6	+500	+51–1	+60–1	+62–1	+62–1	+74–2	+74–2
h6	H7	+580	+59–1	+69–1	+71–1	+71–1	+85–2	+85–2
h6	JS6	+43,5–6,5	+44,5–7,5	+52–9	+54–9	+54–9	+64,5–11,5	+64,5–11,5

Operating clearance

Δ_s = operating clearance