# 6901 bearing dimensions

A 6901 bearing is 12 mm bore × 24 mm outside diameter × 6 mm wide (0.472 × 0.945 × 0.236 in). The sealed version is 6901-2RS; the shielded version is 6901-ZZ.

## 6901 data

- Type: deep groove ball bearing, 69 series (thin-section)
- Bore d: 12 mm (0.4724 in)
- Outside diameter D: 24 mm (0.9449 in)
- Width B: 6 mm (0.2362 in)
- Bore code: 01 = 12 mm (codes 00 to 03 are fixed: 10, 12, 15 and 17 mm)
- Sealed: 6901-2RS; shielded: 6901-ZZ; open: 6901

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6901-2RSH | 6901-2Z |
| FAG (Schaeffler) | 6901-2RSR | 6901-2ZR |
| NSK | 6901DDU | 6901ZZ |
| NTN | 6901LLU | 6901ZZ |
| Koyo (JTEKT) | 6901-2RS | 6901ZZ |
| Timken | 6901-2RS | see catalogue |

## Same 12 mm bore, other series

| Bearing | Series | OD mm | Width mm |
|---|---|---|---|
| 6801 | thin-section | 21 | 5 |
| 6901 | thin-section | 24 | 6 |
| 6001 | extra-light | 28 | 8 |
| 6201 | light | 32 | 10 |
| 6301 | medium | 37 | 12 |


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

## FAQ

**What size is a 6901 bearing?**
12 mm bore, 24 mm outside diameter and 6 mm wide, which is 0.472 × 0.945 × 0.236 in.

**What does 2RS mean on a 6901 bearing?**
6901-2RS has rubber contact seals on both sides. 6901-ZZ (also written 6901-2Z) has metal shields on both sides. Both have the same 12 × 24 × 6 mm dimensions.

**Is 6901-2RS the same as 6901-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6901-2RS keeps out fine dirt and water better; the shielded 6901-ZZ runs with less friction.

**What is the SKF equivalent of 6901-2RS?**
SKF writes it 6901-2RSH; FAG 6901-2RSR, NSK 6901DDU, NTN 6901LLU and Koyo 6901-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6901 mean?**
6 is the deep groove ball bearing type, 9 is the thin-section dimension series, and 01 = 12 mm (codes 00 to 03 are fixed: 10, 12, 15 and 17 mm).

**Which bearings have the same bore as 6901?**
6801, 6001, 6201, 6301 also have a 12 mm bore, with different outside diameters and widths.

Source page: https://machinistcharts.com/bearing/6901/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)