How do I set clearance in tapered roller bearings?

Usually with a nut or a shim pack: tighten until clearance disappears while watching the turning torque, then back off by the value given by the machine manufacturer. Verify with a dial gauge on the shaft, measuring axial movement.

Do both bearings have to be replaced together?

The cone and its matching outer race always go together — they are lapped as a pair at the factory. The second bearing in the assembly is replaced when it has run the same hours: a new one next to a worn one takes most of the load and fails quickly.

Shop under constructionThe catalogue and prices are already up to date, but we are not taking orders yet. Need a bearing now — write to us.

Tapered roller bearings

Tapered roller bearings, single and double row

1–12 z 82

In stock (57 pcs)
FAG
30204-A
Tapered roller bearing
⌀20 × 47 mm
dispatch within 24 h
EUR 8.20incl. VAT
EUR 10.11−19%
In stock (22 pcs)
FAG
30208-XL
Tapered roller bearing
⌀40 × 80 mm
dispatch within 24 h
EUR 15.31incl. VAT
EUR 17.01−10%
In stock (46 pcs)
FAG
30211-DY
Tapered roller bearing
⌀55 × 100 mm
dispatch within 24 h
EUR 22.60incl. VAT
EUR 27.82−19%
In stock (78 pcs)
FAG
30212-XL
Tapered roller bearing
⌀60 × 110 mm
dispatch within 24 h
EUR 26.89incl. VAT
EUR 27.76−3%
Last few (8)
FAG
30215-A
Tapered roller bearing
⌀75 × 130 mm
dispatch within 24 h
EUR 39.14incl. VAT
EUR 45.77−14%
Last few (13)
FAG
30217-A
Tapered roller bearing
⌀85 × 150 mm
dispatch within 24 h
EUR 55.79incl. VAT
Last few (2)
FAG
30220-A
Tapered roller bearing
⌀100 × 180 mm
dispatch within 24 h
EUR 108.07incl. VAT
Last few (5)
FAG
30221-A
Tapered roller bearing
⌀105 × 190 mm
dispatch within 24 h
EUR 133.21incl. VAT
Last few (3)
FAG
30222-XL
Tapered roller bearing
⌀110 × 200 mm
dispatch within 24 h
EUR 211.02incl. VAT
EUR 233.18−10%
Last few (8)
FAG
30302-A
Tapered roller bearing
⌀15 × 42 mm
dispatch within 24 h
EUR 9.77incl. VAT
EUR 10.14−4%
Last few (18)
FAG
30303-A
Tapered roller bearing
⌀17 × 47 mm
dispatch within 24 h
EUR 9.80incl. VAT
Last few (17)
FAG
30304-A
Tapered roller bearing
⌀20 × 52 mm
dispatch within 24 h
EUR 10.22incl. VAT
EUR 10.26−0%

Łożyska stożkowe

Tapered roller bearings carry high radial and axial loads at the same time, but in one direction only — which is why they are mounted in pairs, in an O or X arrangement. Classic applications are wheel hubs, spindles, bevel gearboxes and anywhere the axial force is constant and significant.

They are separable: the cone with cage and rollers comes off the outer race. That eases mounting but requires setting clearance or preload when assembling — and that step causes most of the failures.

What to look at when selecting

Choose the arrangement: O (wide base, stiff guidance) or X (shorter base, simpler assembly).
Decide whether the assembly runs with clearance or with preload — preload adds stiffness but also heat.
Account for thermal expansion of the shaft: too much preload when cold becomes seizure when hot.
The cone and its outer race are a factory-matched set — never mix parts from different bearings.

Common questions

How do I set clearance in tapered roller bearings?: Usually with a nut or a shim pack: tighten until clearance disappears while watching the turning torque, then back off by the value given by the machine manufacturer. Verify with a dial gauge on the shaft, measuring axial movement.
Do both bearings have to be replaced together?: The cone and its matching outer race always go together — they are lapped as a pair at the factory. The second bearing in the assembly is replaced when it has run the same hours: a new one next to a worn one takes most of the load and fails quickly.