• Tolerance and operating clearance
• Mounting tolerances and operating clearance

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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.

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

For adjustment of the operating clearance see link.

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Tolerance and operating clearance

Linear bearings and linear bearing and housing units Designation Tolerance Operating clearance Shaft Bore Compact range KH See table, link KGHK, KTHK h6 - Standard     Adjusting range KGHW, KGHWT h6 - Standard Light range KN-B, KNO-B h6 H7 Slight preload KGN, KTN, KTFN, KGNO, KTNO, KGNC h6 - Slight preload KGNS, KTNS, KGNOS, KTNOS, KGNCS - - Adjustable by means of screw Heavy duty range KS, KSO h6 H7 Slight preload 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 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 PAGBA, PAGBAO h7 - Standard

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Mounting tolerances and operating clearance

The theoretically possible operating clearance for the individual series is shown in the following tables and Figure 1.

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

Mounting tolerance Operating clearance All sizes Shaft Bore 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 (clearance in μm) Shaft Bore 12 16 20 25 30 40 50 h6 H6 +36–8 +34–10 +37–12 +34–15 +29–20 +33–22 +30–25 h6 H7 +44–8 +32–10 +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 (clearance in μm) Shaft Bore 12 16 20 25 30 40 50 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 (clearance in μm) Shaft Bore 12 16 20 25 30 40 50 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

Δs = operating clearance Figure 1 Operating clearance

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