# 6305 bearing dimensions

A 6305 bearing is 25 mm bore × 62 mm outside diameter × 17 mm wide (0.984 × 2.441 × 0.669 in). The sealed version is 6305-2RS; the shielded version is 6305-ZZ.

## 6305 data

- Type: deep groove ball bearing, 63 series (medium)
- Bore d: 25 mm (0.9843 in)
- Outside diameter D: 62 mm (2.4409 in)
- Width B: 17 mm (0.6693 in)
- Bore code: 05 × 5 = 25 mm (from 04 up, multiply by 5)
- Sealed: 6305-2RS; shielded: 6305-ZZ; open: 6305

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6305-2RSH | 6305-2Z |
| FAG (Schaeffler) | 6305-2RSR | 6305-2ZR |
| NSK | 6305DDU | 6305ZZ |
| NTN | 6305LLU | 6305ZZ |
| Koyo (JTEKT) | 6305-2RS | 6305ZZ |
| Timken | 6305-2RS | 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 6305 bearing?**
25 mm bore, 62 mm outside diameter and 17 mm wide, which is 0.984 × 2.441 × 0.669 in.

**What does 2RS mean on a 6305 bearing?**
6305-2RS has rubber contact seals on both sides. 6305-ZZ (also written 6305-2Z) has metal shields on both sides. Both have the same 25 × 62 × 17 mm dimensions.

**Is 6305-2RS the same as 6305-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6305-2RS keeps out fine dirt and water better; the shielded 6305-ZZ runs with less friction.

**What is the SKF equivalent of 6305-2RS?**
SKF writes it 6305-2RSH; FAG 6305-2RSR, NSK 6305DDU, NTN 6305LLU and Koyo 6305-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6305 mean?**
6 is the deep groove ball bearing type, 3 is the medium dimension series, and 05 × 5 = 25 mm (from 04 up, multiply by 5).

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

Source page: https://machinistcharts.com/bearing/6305/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)