The Timken 239 Series is a thin-section, double-row, self-aligning spherical roller bearing built for large-bore, low-profile applications. With a smaller cross-section than the heavier 230/231/232 series at the same bore size, the 239 fits into space-constrained large-shaft housings while still delivering Timken’s self-aligning geometry and brass machined finger cage durability. Common on centrifugal pump shafts, large electric motors, paper-machine rolls, marine propulsion, and wind-turbine main shafts where housing envelope is tight but bore diameters are large.

• Construction: Double-row self-aligning, thin cross-section — compensates for shaft misalignment up to 1º under load while minimizing radial envelope.
• Cage: Brass machined finger (“EM” suffix) — shock tolerance and thermal stability superior to stamped steel; standard across the 239 line.
• Relubrication: Most variants carry the W33 feature (oil groove + three holes in the outer ring) for in-service regreasing; some W20 variants with application-specific lube ports.
• Clearance classes: C0 (Normal) and C3 dominate; Special clearance on specific large variants.
• Bore range: 130 mm – 480 mm (5.12 in – 18.90 in).
• OD range: 180 mm – 650 mm — substantially smaller OD at any given bore than 230/231/232 for tight housings.
• Typical applications: Large centrifugal pumps, paper-machine rolls, marine propulsion bearings, wind-turbine main shafts, mill stand guide rolls, large electric motors.

Why 239 vs. 240/241: The 239 has the thinnest cross-section in the large-bore spherical roller family — choose 239 when housing OD is constrained; step up to 240 or 241 when radial and axial load demands exceed the 239’s capacity.