IKO NTB1024 Thrust Needle Roller Bearing, 10 x 24 x 2 mm

The NTB is the IKO thrust needle roller bearing: a steel cage with needle rollers, supplied without raceway rings, for axial (thrust) load in a very thin section. This page lists 19 NTB sizes for shafts from 10 to 90 mm, with outside diameters of 24 to 120 mm and a width of 2 to 4 mm. Choose the shaft size from the drop-down; each variant has its own dimensions, load ratings and mass in the Model Details.

The NTB has the lowest sectional height of the IKO thrust bearing types, so it can replace a conventional thrust washer, and it withstands high-speed rotation with a low coefficient of friction. The cage is precisely press-formed steel plate with a surface-hardened finish, the needle rollers have a diameter variation within 2 µm, and the cage holds lubricant well.

The NTB is the bearing only. Its raceways are AS thrust washers, WS inner rings and GS outer rings of the same size (all sold separately, see Related products), or machine surfaces that are heat-treated and ground.

Where this product is used

• Machine tools
• Driving mechanisms for automobiles
• High-pressure pumps
• Compact axial-load positions where a conventional thrust washer takes too much space
• Designs where hardened and ground machine surfaces act as the raceways

Features

• Steel cage with needle rollers: a thrust needle roller bearing supplied without raceway rings
• Lowest sectional height of the IKO thrust bearing types: 2 to 4 mm wide on this page
• Low coefficient of friction at high rotational speed; allowable speeds on this page run from 2,500 to 15,000 rpm with oil lubrication (for grease lubrication, a maximum of 25% of the value)
• Basic dynamic load ratings of 7.82 to 64.5 kN and static ratings of 23.9 to 394 kN across the sizes on this page
• High lubricant-retaining capacity; precise needle rollers with a diameter variation within 2 µm
• Runs on AS thrust washers, WS and GS rings, or on heat-treated, ground machine surfaces (58 to 64 HRC)

Key specifications

Available sizes

C is the basic dynamic load rating, C0 the basic static load rating and Dw the width of the bearing. The allowable speed applies to oil lubrication; for grease lubrication a maximum of 25% of the value is allowable. Mass is a reference value.

Selecting the right option

Each variant is one size. Choose the shaft diameter in mm from the drop-down: the model number is the bore diameter followed by the outside diameter, so NTB3047 has a 30 mm bore and a 47 mm outside diameter.

The NTB is the cage and needle rollers only. Each face of the bearing runs on a raceway: an AS thrust washer, a WS inner ring or GS outer ring of the same size, or a hardened and ground machine surface. The washers and rings are separate items on their own pages (see Related products).

The load ratings and speeds on this page belong to the NTB. The AS, WS and GS parts have no separate rating.

For a thicker cage with cylindrical rollers, compare the AZK thrust roller bearing: its width on its page runs from 3.5 to 11 mm, against 2 to 4 mm for the NTB here.

Fitting and use

Where AS washers or WS and GS rings are not used, harden the mating surfaces to 58 to 64 HRC with an adequate effective hardening depth and finish them to a surface roughness below 0.2 µm Ra.

The recommended shaft tolerance class is h8. The bearing is generally used with its inner surface as the guide surface.

Finish the mounting surfaces at right angles to the centre axis and keep them sufficiently rigid.

The allowable rotational speed in the Model Details applies to oil lubrication; for grease lubrication a maximum of 25% of that value is allowable. Check the load and speed against the figures before ordering, and apply a suitable safety factor.

If you are unsure which parts suit your shaft and housing, send AIMS the part numbers or sizes and we will confirm the match.

Related products

Raceways for the NTB: AS thrust washers, 1 mm thick (19 of the 19 NTB sizes here have an AS size of the same size on AIMS), WS inner rings (9 of 19) and GS outer rings (15 of 19). For a thicker cage with cylindrical rollers, see the AZK thrust roller bearings.