# 6204 bearing dimensions

A 6204 bearing is 20 mm bore × 47 mm outside diameter × 14 mm wide (0.787 × 1.850 × 0.551 in). The sealed version is 6204-2RS; the shielded version is 6204-ZZ.

## 6204 data

- Type: deep groove ball bearing, 62 series (light)
- Bore d: 20 mm (0.7874 in)
- Outside diameter D: 47 mm (1.8504 in)
- Width B: 14 mm (0.5512 in)
- Bore code: 04 × 5 = 20 mm (from 04 up, multiply by 5)
- Sealed: 6204-2RS; shielded: 6204-ZZ; open: 6204

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6204-2RSH | 6204-2Z |
| FAG (Schaeffler) | 6204-2RSR | 6204-2ZR |
| NSK | 6204DDU | 6204ZZ |
| NTN | 6204LLU | 6204ZZ |
| Koyo (JTEKT) | 6204-2RS | 6204ZZ |
| Timken | 6204-2RS | see catalogue |

## Same 20 mm bore, other series

| Bearing | Series | OD mm | Width mm |
|---|---|---|---|
| 6804 | thin-section | 32 | 7 |
| 6904 | thin-section | 37 | 9 |
| 6004 | extra-light | 42 | 12 |
| 6204 | light | 47 | 14 |
| 6304 | medium | 52 | 15 |


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

## FAQ

**What size is a 6204 bearing?**
20 mm bore, 47 mm outside diameter and 14 mm wide, which is 0.787 × 1.850 × 0.551 in.

**What does 2RS mean on a 6204 bearing?**
6204-2RS has rubber contact seals on both sides. 6204-ZZ (also written 6204-2Z) has metal shields on both sides. Both have the same 20 × 47 × 14 mm dimensions.

**Is 6204-2RS the same as 6204-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6204-2RS keeps out fine dirt and water better; the shielded 6204-ZZ runs with less friction.

**What is the SKF equivalent of 6204-2RS?**
SKF writes it 6204-2RSH; FAG 6204-2RSR, NSK 6204DDU, NTN 6204LLU and Koyo 6204-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6204 mean?**
6 is the deep groove ball bearing type, 2 is the light dimension series, and 04 × 5 = 20 mm (from 04 up, multiply by 5).

**Which bearings have the same bore as 6204?**
6804, 6904, 6004, 6304 also have a 20 mm bore, with different outside diameters and widths.

Source page: https://machinistcharts.com/bearing/6204/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)