# 6004 bearing dimensions

A 6004 bearing is 20 mm bore × 42 mm outside diameter × 12 mm wide (0.787 × 1.654 × 0.472 in). The sealed version is 6004-2RS; the shielded version is 6004-ZZ.

## 6004 data

- Type: deep groove ball bearing, 60 series (extra-light)
- Bore d: 20 mm (0.7874 in)
- Outside diameter D: 42 mm (1.6535 in)
- Width B: 12 mm (0.4724 in)
- Bore code: 04 × 5 = 20 mm (from 04 up, multiply by 5)
- Sealed: 6004-2RS; shielded: 6004-ZZ; open: 6004

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6004-2RSH | 6004-2Z |
| FAG (Schaeffler) | 6004-2RSR | 6004-2ZR |
| NSK | 6004DDU | 6004ZZ |
| NTN | 6004LLU | 6004ZZ |
| Koyo (JTEKT) | 6004-2RS | 6004ZZ |
| Timken | 6004-2RS | 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 6004 bearing?**
20 mm bore, 42 mm outside diameter and 12 mm wide, which is 0.787 × 1.654 × 0.472 in.

**What does 2RS mean on a 6004 bearing?**
6004-2RS has rubber contact seals on both sides. 6004-ZZ (also written 6004-2Z) has metal shields on both sides. Both have the same 20 × 42 × 12 mm dimensions.

**Is 6004-2RS the same as 6004-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6004-2RS keeps out fine dirt and water better; the shielded 6004-ZZ runs with less friction.

**What is the SKF equivalent of 6004-2RS?**
SKF writes it 6004-2RSH; FAG 6004-2RSR, NSK 6004DDU, NTN 6004LLU and Koyo 6004-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6004 mean?**
6 is the deep groove ball bearing type, 0 is the extra-light dimension series, and 04 × 5 = 20 mm (from 04 up, multiply by 5).

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

Source page: https://machinistcharts.com/bearing/6004/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)