30311 is Nachi single-row Tapered roller bearing can support a combined radial and axial load, the cage is Chrome Steel, 30311 inner diameter is 55mm, 30311 outer diameter is 120mm and 30311 width is 31.5mm.

• Item: 30311 Nachi Ball Bearing
• Type: Nachi Tapered Roller Ball Bearing
• Cage: Chrome Steel
• Dimensions: 55mm x 120mm x 31.5mm/Metric
• ID (inner diameter)/Bore: 55mm
• OD (outer diameter): 120mm
• Width/Height/thickness: 31.5mm
• Size: 55 x 120 x 31.5 mmm
• Quantity: One Bearing
• Dynamic load rating Cr: 149,000 N
• Static load rating Cor: 170,000 N
• Limiting Speed:
  • Grease Lubrication: 3,300 RPM
  • Oil Lubrication: 4,500 RPM
• Made in Japan