FAG20328MBSingle Row Barrel Roller Bearing – 140 mm ID, 300 mm OD, 62 mm Width, Open, Cylindrical Bore, Machined Brass Cage, CN Clearance

Product Description

What this part is

FAG 20328-MB, a single-row barrel roller bearing. Series: 203. Bore: 140 mm (5.5118 in). Outside Diameter: 300 mm (11.8110 in). Width: 62 mm (2.4409 in). One row of barrel-shaped rollers runs on a spherical outer raceway, so the inner ring, roller set and cage swivel inside the outer ring. Cylindrical bore. Country of origin: Germany.

Decoding the designation

203 is the heavy-section single-row barrel roller series, a larger outside diameter and wider section than the 202 range on the same bore. The bore code 28 gives a 140 mm bore, at five millimetres per unit of code. MB is a solid machined brass cage. The designation carries no K, so the bore is cylindrical.

What these specs mean in practice

A barrel roller carries radial load and self-aligns on its spherical outer raceway, absorbing shaft deflection and housing misalignment without edge-loading the rollers. Load is radial. The 203 section is wider and larger in outside diameter than a 20228 on the same 140 mm shaft, which buys longer rollers and higher radial capacity. Internal Clearance: CN, the normal group. The machined brass cage carries higher speed and temperature than a pressed steel cage, and it sets the 200 °C maximum operating temperature.

Bore form

Cylindrical. The bearing mounts directly on the shaft seat. Schaeffler spells the tapered-bore execution 20328K.MB, with an explicit K in the string, and no K appears here.

Quantity and configuration

One bearing.

Interchange guidance

Searchable variants: 20328-MB, 20328MB, 20328 MB, 20328M, 20328. Other makers on the same envelope: SKF 20328 M, NSK 20328 M, Koyo 20328 M, NTN 20328 M. Related sizes: 20328K.MB is the same envelope with a 1:12 tapered bore, which takes an adapter sleeve on a plain shaft; 20228-MB is the lighter 202 section on the same 140 mm bore, at 250 mm outside diameter and 42 mm wide; and 22328 is a double-row spherical roller bearing, a different bearing type.