IKO IRT1220-1 Shell Type Needle Roller Inner Ring, 12 x 16 x 20.5 mm

This page covers 112 IKO metric series inner rings for shell type needle roller bearings, 7 to 60 mm bore. Choose the size from the drop-downs (outside diameter F, width B and shaft diameter, 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 TA...Z and TLA...Z shell type needle roller bearings, with TAM, TLAM, YT and YTL for some sizes, and TAW and TLAW codes against some sizes; the Model Details show the bearings for each size.

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 to 60 mm, outside diameter 10 to 70 mm and width 10.5 to 50.5 mm across 112 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. rs min is the minimum allowable chamfer dimension.

Selecting the right option

The drop-downs are outside diameter (F), width (B) and shaft diameter, which is the ring bore d. For example, IRT710 has a 7 mm bore, a 10 mm outside diameter and a 10.5 mm width.

Some bore and width combinations come in more than one outside diameter, and the part number can then end in -1 or -2. For example IRT1012, IRT1012-1 and IRT1012-2 have outside diameters of 13, 15 and 14 mm, so check F and the assembled bearings in the Model Details rather than relying on the bore and width alone.

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.

rs min is the minimum allowable chamfer dimension of the ring, 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.

Related products

Bearings these rings are matched to: TA series shell type needle roller bearings and TLA series shell type needle roller bearings. Inch series rings for shell type bearings are on the IRB inner ring page.