# 6203 bearing dimensions

A 6203 bearing is 17 mm bore × 40 mm outside diameter × 12 mm wide (0.669 × 1.575 × 0.472 in). The sealed version is 6203-2RS; the shielded version is 6203-ZZ.

## 6203 data

- Type: deep groove ball bearing, 62 series (light)
- Bore d: 17 mm (0.6693 in)
- Outside diameter D: 40 mm (1.5748 in)
- Width B: 12 mm (0.4724 in)
- Bore code: 03 = 17 mm (codes 00 to 03 are fixed: 10, 12, 15 and 17 mm)
- Sealed: 6203-2RS; shielded: 6203-ZZ; open: 6203

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6203-2RSH | 6203-2Z |
| FAG (Schaeffler) | 6203-2RSR | 6203-2ZR |
| NSK | 6203DDU | 6203ZZ |
| NTN | 6203LLU | 6203ZZ |
| Koyo (JTEKT) | 6203-2RS | 6203ZZ |
| Timken | 6203-2RS | see catalogue |

## Same 17 mm bore, other series

| Bearing | Series | OD mm | Width mm |
|---|---|---|---|
| 6803 | thin-section | 26 | 5 |
| 6903 | thin-section | 30 | 7 |
| 6003 | extra-light | 35 | 10 |
| 6203 | light | 40 | 12 |
| 6303 | medium | 47 | 14 |


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

## FAQ

**What size is a 6203 bearing?**
17 mm bore, 40 mm outside diameter and 12 mm wide, which is 0.669 × 1.575 × 0.472 in.

**What does 2RS mean on a 6203 bearing?**
6203-2RS has rubber contact seals on both sides. 6203-ZZ (also written 6203-2Z) has metal shields on both sides. Both have the same 17 × 40 × 12 mm dimensions.

**Is 6203-2RS the same as 6203-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6203-2RS keeps out fine dirt and water better; the shielded 6203-ZZ runs with less friction.

**What is the SKF equivalent of 6203-2RS?**
SKF writes it 6203-2RSH; FAG 6203-2RSR, NSK 6203DDU, NTN 6203LLU and Koyo 6203-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6203 mean?**
6 is the deep groove ball bearing type, 2 is the light dimension series, and 03 = 17 mm (codes 00 to 03 are fixed: 10, 12, 15 and 17 mm).

**Which bearings have the same bore as 6203?**
6803, 6903, 6003, 6303 also have a 17 mm bore, with different outside diameters and widths.

Source page: https://machinistcharts.com/bearing/6203/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)