FAG20409MBSingle Row Barrel Roller Bearing 45x120x29 mm Cylindrical Bore Brass Cage

Product Description

What this part is

FAG 20409-MB, a single-row barrel roller bearing. 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. Boundary dimensions 45 mm bore × 120 mm outside diameter × 29 mm width. Cylindrical bore.

Decoding the designation

20 – barrel roller, single row4 – ISO dimension series, the heaviest of the barrel roller sections09 – bore code, 9 × 5 = 45 mm boreMB – machined brass cage, inner-ring guided

What these specs mean in practice

The barrel roller carries radial load and self-aligns on its spherical outer raceway, taking shaft deflection and housing misalignment without edge loading the rollers. Load is radial only. The 204 section puts a 120 mm outside diameter on a 45 mm shaft, the largest cross-section available at that bore, which buys the highest radial capacity of the barrel roller range. The machined brass cage runs at higher speed and temperature than a pressed steel cage.

Published specifications

Bore: 45 mm (1.7717 in)Outside diameter: 120 mm (4.7244 in)Width: 29 mm (1.1417 in)Rows: 1Bore form: cylindricalCage: machined brass, MBInternal clearance: CN (normal)

Quantity and configuration

1 Pc. Bearing only, cylindrical bore, mounted directly on the shaft seat.

Interchange guidance

Alternate written forms of the same bearing: 20409-MB, 20409MB, 20409M, 20409. The 20309 and 20209 are the lighter 203 and 202 sections on the same 45 mm bore and are related sizes. The 22409 is a double-row spherical roller bearing, a different bearing type.