# 6906 bearing dimensions

A 6906 bearing is 30 mm bore × 47 mm outside diameter × 9 mm wide (1.181 × 1.850 × 0.354 in). The sealed version is 6906-2RS; the shielded version is 6906-ZZ.

## 6906 data

- Type: deep groove ball bearing, 69 series (thin-section)
- Bore d: 30 mm (1.1811 in)
- Outside diameter D: 47 mm (1.8504 in)
- Width B: 9 mm (0.3543 in)
- Bore code: 06 × 5 = 30 mm (from 04 up, multiply by 5)
- Sealed: 6906-2RS; shielded: 6906-ZZ; open: 6906

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6906-2RSH | 6906-2Z |
| FAG (Schaeffler) | 6906-2RSR | 6906-2ZR |
| NSK | 6906DDU | 6906ZZ |
| NTN | 6906LLU | 6906ZZ |
| Koyo (JTEKT) | 6906-2RS | 6906ZZ |
| Timken | 6906-2RS | see catalogue |

## Same 30 mm bore, other series

| Bearing | Series | OD mm | Width mm |
|---|---|---|---|
| 6806 | thin-section | 42 | 7 |
| 6906 | thin-section | 47 | 9 |
| 6006 | extra-light | 55 | 13 |
| 6206 | light | 62 | 16 |
| 6306 | medium | 72 | 19 |


Load ratings and speed limits vary by maker: take them from the manufacturer's catalogue.

## FAQ

**What size is a 6906 bearing?**
30 mm bore, 47 mm outside diameter and 9 mm wide, which is 1.181 × 1.850 × 0.354 in.

**What does 2RS mean on a 6906 bearing?**
6906-2RS has rubber contact seals on both sides. 6906-ZZ (also written 6906-2Z) has metal shields on both sides. Both have the same 30 × 47 × 9 mm dimensions.

**Is 6906-2RS the same as 6906-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6906-2RS keeps out fine dirt and water better; the shielded 6906-ZZ runs with less friction.

**What is the SKF equivalent of 6906-2RS?**
SKF writes it 6906-2RSH; FAG 6906-2RSR, NSK 6906DDU, NTN 6906LLU and Koyo 6906-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6906 mean?**
6 is the deep groove ball bearing type, 9 is the thin-section dimension series, and 06 × 5 = 30 mm (from 04 up, multiply by 5).

**Which bearings have the same bore as 6906?**
6806, 6006, 6206, 6306 also have a 30 mm bore, with different outside diameters and widths.

Source page: https://machinistcharts.com/bearing/6906/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)