Bearings 55 × 120 × 29 mm
60 items fitting a seat with 55 mm bore, 120 mm outside diameter and 29 mm width. All genuine FAG and INA, with manufacturer technical data.
This seat holds 60 items: 35 × deep groove ball bearing, 8 × spherical roller bearing, 4 × cylindrical roller bearing and 4 × self-aligning ball bearing. They differ in design: open, 2RSR seals, single shield and 2Z shields. They come with C2, C3, C4, C5 and CN clearance. 17 items ship within 24 h, the rest are brought in to order.
How items of the same size differ
One seat size comes in several designs. The suffix tells them apart: 2Z means shields on both sides, 2RSR contact seals, C3 a clearance greater than normal (for higher operating temperatures); no clearance suffix means normal CN. For dirty environments choose contact seals, for high speed a shield.
How to measure a bearing
The bore d takes the shaft, the outside diameter D sits in the housing, B is the ring width. Measure with a caliper on a cold, cleaned bearing; catalogue sizes are whole millimetres or halves, so a reading of 24.97 mm means 25 mm.
Common questions about this size
- Which bearing has dimensions 55 × 120 × 29 mm?
- 60 items in our catalogue fit this seat — among them 21311-E1-XL-K, 6311-C-N and 6311-H-2RSR-SN-C3. The base number is shared across manufacturers; only the suffixes describing the design differ.
- Which of them are in stock?
- Shipping within 24 h from stock: NJ311-E-XL-TVP2, NU311-E-XL-M1, 7311-B-XL-JP and 6311-C-2HRS-C3. The rest are brought in to order — the delivery date is on each item's page.
- Can I take a different design in the same size?
- The seat fits in every design, but what changes is what decides service life. Contact seals (2RSR) keep dust and moisture out better, shields (2Z) allow higher speeds, C3 clearance is needed with heat or a tight fit, and open bearings need lubrication from outside.