The Timken 230 Series is a wide cross-section, double-row, self-aligning spherical roller bearing engineered for heavy radial duty at large bore diameters. Wider than the medium-duty 222/223 series but narrower than the 231/241, the 230 is the workhorse for heavy gearbox shafts, large centrifugal pumps, paper-machine rolls, rolling-mill backup rolls, and continuous-service conveyor pulleys where sustained radial load dominates.

• Construction: Double-row self-aligning, wide section — compensates for shaft misalignment up to 1º while carrying heavy sustained radial load.
• Cage options: Both brass machined finger (“EM” suffix) and steel stamped window (“EJ” suffix) variants — roughly balanced across the series; brass machined preferred for shock, vibration, and high-temperature service.
• Bore types: Both cylindrical (straight) and tapered (“K” suffix) bore variants available across the full range.
• Relubrication: W33 feature (oil groove + three holes in outer ring) standard on most variants.
• Clearance classes: C0, C2, C3, C4 available — C3 or C4 recommended for elevated-temperature and interference-fit applications.
• Bore range: 110 mm – 480 mm (4.33 in – 18.90 in).
• Width range: 45 mm – 165 mm.
• Typical applications: Heavy gearbox input/output shafts, large centrifugal pumps, paper-machine rolls, rolling-mill backup rolls, continuous-service conveyor pulleys, mixer and agitator drives, electric motors.

Why 230 vs. 231: The 230 has a narrower cross-section and lower axial capacity than the 231 — choose 230 for predominantly radial duty where axial thrust is minimal; step up to 231 when axial thrust is non-trivial.