# 6905 bearing dimensions

A 6905 bearing is 25 mm bore × 42 mm outside diameter × 9 mm wide (0.984 × 1.654 × 0.354 in). The sealed version is 6905-2RS; the shielded version is 6905-ZZ.

## 6905 data

- Type: deep groove ball bearing, 69 series (thin-section)
- Bore d: 25 mm (0.9843 in)
- Outside diameter D: 42 mm (1.6535 in)
- Width B: 9 mm (0.3543 in)
- Bore code: 05 × 5 = 25 mm (from 04 up, multiply by 5)
- Sealed: 6905-2RS; shielded: 6905-ZZ; open: 6905

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6905-2RSH | 6905-2Z |
| FAG (Schaeffler) | 6905-2RSR | 6905-2ZR |
| NSK | 6905DDU | 6905ZZ |
| NTN | 6905LLU | 6905ZZ |
| Koyo (JTEKT) | 6905-2RS | 6905ZZ |
| Timken | 6905-2RS | see catalogue |

## Same 25 mm bore, other series

| Bearing | Series | OD mm | Width mm |
|---|---|---|---|
| 6805 | thin-section | 37 | 7 |
| 6905 | thin-section | 42 | 9 |
| 6005 | extra-light | 47 | 12 |
| 6205 | light | 52 | 15 |
| 6305 | medium | 62 | 17 |


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

## FAQ

**What size is a 6905 bearing?**
25 mm bore, 42 mm outside diameter and 9 mm wide, which is 0.984 × 1.654 × 0.354 in.

**What does 2RS mean on a 6905 bearing?**
6905-2RS has rubber contact seals on both sides. 6905-ZZ (also written 6905-2Z) has metal shields on both sides. Both have the same 25 × 42 × 9 mm dimensions.

**Is 6905-2RS the same as 6905-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6905-2RS keeps out fine dirt and water better; the shielded 6905-ZZ runs with less friction.

**What is the SKF equivalent of 6905-2RS?**
SKF writes it 6905-2RSH; FAG 6905-2RSR, NSK 6905DDU, NTN 6905LLU and Koyo 6905-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6905 mean?**
6 is the deep groove ball bearing type, 9 is the thin-section dimension series, and 05 × 5 = 25 mm (from 04 up, multiply by 5).

**Which bearings have the same bore as 6905?**
6805, 6005, 6205, 6305 also have a 25 mm bore, with different outside diameters and widths.

Source page: https://machinistcharts.com/bearing/6905/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)