Timken23144EMBW33Spherical Roller Bearing – Straight Bore, 220 mm ID, 370 mm OD, 120 mm Width, Open, Machined Brass Cage, CN Internal Clearance

Product Description

What this part is

Timken 23144EMBW33 double-row spherical roller bearing, 231 series, 220 x 370 x 120 mm. Bore Diameter: 220 mm. Outside Diameter: 370 mm. Overall Width: 120 mm. Bore Type: Cylindrical. Number Of Rows: 2. Rolling Elements: Spherical Roller. Closure Type: Open. Cage Material: Machined brass. Cage Type: Machined, inner-ring guided. Internal Clearance: CN. Precision Class: RBEC 1 / P0. Bearing Material: Chrome steel. Series: 231. Base Number: 23144. Item Weight: 52.8 kg (116.20 lb).

Decoding the designation

23144 — 231 dimension series, bore code 44, giving a 220 mm bore in a 370 mm outside diameter and a 120 mm width.

E — reinforced high-capacity internal design, carrying a higher load rating than the standard execution on the same envelope.

MB — machined brass cage, inner-ring guided.

W33 — annular lubrication groove in the outer ring outside diameter with three radial feed holes.

What these specs mean in practice

Dynamic Load Rating: 1,940,000 N. Static Load Rating: 2,740,000 N. A double-row spherical roller carries very heavy radial load and takes thrust in both directions.

Limiting Speed: 1,100 rpm grease; 1,200 rpm oil. Lubricant: grease or oil. The groove distributes lubricant circumferentially around the outer ring and the three radial holes carry it inward to both roller rows, serving circulating-oil, oil-mist, single-point and centralised grease systems.

Cage Material: Machined brass. A machined brass cage holds its form under shock and acceleration loading and tolerates higher operating temperatures than a polymer cage. Precision Class: RBEC 1 / P0, the standard tolerance class for industrial spherical rollers.

The spherical outer raceway lets the inner ring and roller assembly swivel, absorbing shaft deflection and housing-bore misalignment. The 231 series is the wider, higher-capacity section on this 220 mm bore.

Mounting data

Shaft backing shoulder diameter: 252 mm. Housing backing shoulder diameter: 336 mm. Maximum shaft fillet radius: 3 mm. The straight cylindrical bore seats directly on the shaft.

Calculation factors: e Factor: 0.31. Static factor Y0: 2.12. Dynamic factor Y at Fa/Fr up to e, X = 0.67: 2.17. Dynamic factor Y above e, X = 1: 3.24. Geometry factor Cg: 0.1033.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing, open on both faces, straight cylindrical bore.

Interchange guidance

The 23144 envelope is an ISO boundary size, so the 220 x 370 x 120 mm dimensions are shared across manufacturers. Equivalents: SKF 23144 CC/W33, FAG 23144-BE-XL, NSK 23144CAME4, NTN 23144EMD1, RHP 23144EMW33, Koyo 23144RW33, MRC 23144W33, SNR 23144EAW33.

Timken 23144EJW33 shares the envelope with a pressed steel cage. Timken 23144KEMBW33 shares the envelope with a 1:12 tapered bore for adapter-sleeve mounting.