IKO IRB1212 Inch Shell Type Needle Roller Inner Ring, 3/4 x 1 in, 19.43 mm Wide

This page covers 56 IKO inch series inner rings for shell type needle roller bearings, 5/16 to 1 7/8 in bore. Choose the size from the drop-downs (outside diameter F in inches, width B in mm and shaft diameter in mm, which is the ring bore d); each variant has its own dimensions, mass and assembled bearings in the Model Details.

An inner ring (inner race) is the hardened, ground raceway that the needle rollers run on. Needle roller bearings normally run directly on a heat treated, ground shaft; where the shaft cannot be made to the specified surface hardness or roughness, an inner ring is used instead. IKO inner rings are heat treated and finished by grinding to a high degree of accuracy. Rings for shell type bearings are made so that exact radial internal clearances are obtained when they are assembled with shell type needle roller bearings.

Rings are matched to BA...Z and BHA...Z inch series shell type needle roller bearings, with BAM, BHAM, YB and YBH for some sizes, and a BAW code against one size; the Model Details show the bearings for each size. Rings for shell type bearings with seals are not on this page, so ask AIMS if you need one. Sizes are given in mm, with the inch size in brackets.

Where this product is used

• Shaft raceway for a needle roller bearing where the shaft cannot be heat treated and ground to the specified surface hardness and roughness
• Matching inner ring for the assembled bearings listed against each size in the Model Details
• Shafts that move axially, or that run next to a seal, where a wide inner ring is needed
• A bush on a shaft with no further machining

Features

• Heat treated and finished by grinding to a high degree of accuracy
• Bore 7.938 to 47.625 mm, outside diameter 12.7 to 53.975 mm and width 9.9 to 44.83 mm across 56 sizes
• Made for shell type needle roller bearings, so that exact radial internal clearances are obtained when assembled with them
• No oil hole provided
• Can be used as a bush on a shaft with no further machining

Key specifications

Available sizes

Mass is a reference value. ras max is the maximum allowable fillet corner radius of the shaft.

Selecting the right option

The drop-downs are outside diameter (F, in inches), width (B, mm) and shaft diameter (the ring bore d, mm). For example, IRB168 has a 25.4 mm (1 in) bore and a 31.75 mm (1 1/4 in) outside diameter.

Some sizes come with a second outside diameter, and the part number can then end in -1 (for example IRB88 and IRB88-1). Check F and the assembled bearings in the Model Details.

Sizes are given in mm, with the inch size in brackets.

Fitting and use

Check the outside diameter F (the raceway size), the width B and the bore d in the Model Details against your shaft and the mating bearing. Mass is a reference value.

ras max is the maximum allowable fillet corner radius of the shaft, and da is the standard mounting dimension (minimum and maximum) shown in the Model Details.

Match the ring to the bearings shown for it in the Model Details: each ring size is matched to specific bearing part numbers. If you are unsure, send AIMS the part numbers or sizes and we will confirm the fit.

Related products

Bearings these rings are matched to: BA series inch shell type needle roller bearings and BHA series inch heavy duty shell type needle roller bearings. Metric rings for shell type bearings are on the IRT inner ring page.