# 6307 bearing dimensions

A 6307 bearing is 35 mm bore × 80 mm outside diameter × 21 mm wide (1.378 × 3.150 × 0.827 in). The sealed version is 6307-2RS; the shielded version is 6307-ZZ.

## 6307 data

- Type: deep groove ball bearing, 63 series (medium)
- Bore d: 35 mm (1.3780 in)
- Outside diameter D: 80 mm (3.1496 in)
- Width B: 21 mm (0.8268 in)
- Bore code: 07 × 5 = 35 mm (from 04 up, multiply by 5)
- Sealed: 6307-2RS; shielded: 6307-ZZ; open: 6307

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6307-2RSH | 6307-2Z |
| FAG (Schaeffler) | 6307-2RSR | 6307-2ZR |
| NSK | 6307DDU | 6307ZZ |
| NTN | 6307LLU | 6307ZZ |
| Koyo (JTEKT) | 6307-2RS | 6307ZZ |
| Timken | 6307-2RS | see catalogue |

## Same 35 mm bore, other series

| Bearing | Series | OD mm | Width mm |
|---|---|---|---|
| 6807 | thin-section | 47 | 7 |
| 6907 | thin-section | 55 | 10 |
| 6007 | extra-light | 62 | 14 |
| 6207 | light | 72 | 17 |
| 6307 | medium | 80 | 21 |


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

## FAQ

**What size is a 6307 bearing?**
35 mm bore, 80 mm outside diameter and 21 mm wide, which is 1.378 × 3.150 × 0.827 in.

**What does 2RS mean on a 6307 bearing?**
6307-2RS has rubber contact seals on both sides. 6307-ZZ (also written 6307-2Z) has metal shields on both sides. Both have the same 35 × 80 × 21 mm dimensions.

**Is 6307-2RS the same as 6307-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6307-2RS keeps out fine dirt and water better; the shielded 6307-ZZ runs with less friction.

**What is the SKF equivalent of 6307-2RS?**
SKF writes it 6307-2RSH; FAG 6307-2RSR, NSK 6307DDU, NTN 6307LLU and Koyo 6307-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6307 mean?**
6 is the deep groove ball bearing type, 3 is the medium dimension series, and 07 × 5 = 35 mm (from 04 up, multiply by 5).

**Which bearings have the same bore as 6307?**
6807, 6907, 6007, 6207 also have a 35 mm bore, with different outside diameters and widths.

Source page: https://machinistcharts.com/bearing/6307/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)