NSK22224EAC3Spherical Roller Bearing – Straight Bore, 120 mm ID, 215 mm OD, 58 mm Width, Open, Double Row, C3 Internal Clearance, Outer-Ring Lubrication Groove

Product Description

What this part is:

NSK 22224EAC3 double-row spherical roller bearing, 120 mm bore, 215 mm outside diameter, 58 mm width. Two rows of barrel rollers run against a single spherical raceway ground into the outer ring, which lets the inner ring and roller assembly swivel inside the outer ring and absorb shaft misalignment and shaft deflection without concentrating load at the raceway edges.

Decoding the designation:

The full carton designation is 22224 EA E4 C3. In the 222xx series the last two digits are the bore code, so 24 × 5 mm gives the 120 mm bore. EA is the NSK high-capacity internal design with a pressed steel window cage. E4 is NSK’s code for the W33 feature — an annular lubrication groove around the outer ring with three radial feed holes into the roller path. C3 is radial internal clearance greater than normal. There is no K, so the bore is straight.

What these specs mean in practice:

Basic dynamic capacity is 550 kN and basic static capacity 765 kN. A double-row spherical roller bearing carries very high radial load and takes thrust in both directions, and it is the standard choice where a long shaft, a fabricated frame or separately bored housings make perfect alignment impractical. C3 clearance leaves running room for the interference fit and for thermal growth of the inner ring, which is what a heavily loaded or hot-running application needs; the cost is slightly more radial play when cold.

Lubrication provision:

The E4 groove and three holes allow grease or oil to be fed through the housing straight into the loaded zone between the two roller rows, so the bearing can be relubricated in service without dismounting. The housing bore needs a matching feed port for that path to be used.

Bore form:

Straight bore. The shaft seat diameter equals the 120 mm bore and axial location is by shaft shoulder, spacer or locknut against the inner ring face. The tapered-bore version of this size, NSK 22224EAKE4C3, is a related part that mounts on an H3124 adapter sleeve.

Quantity and configuration:

One bearing, complete with inner ring, outer ring, both roller rows and the pressed steel cage. Open on both faces.

Interchange guidance:

The 120 × 215 × 58 mm envelope is ISO-standard across the 22224 designation, so SKF 22224 CC/C3W33, FAG 22224-E1-C3 and Timken 22224EMC3 occupy the same space. Where the housing relies on a through-feed lubrication port, match an execution that carries the groove and holes — W33, E4 or the SKF W33 suffix — because a plain outer ring has no feed path.