# 6301 bearing dimensions

A 6301 bearing is 12 mm bore × 37 mm outside diameter × 12 mm wide (0.472 × 1.457 × 0.472 in). The sealed version is 6301-2RS; the shielded version is 6301-ZZ.

## 6301 data

- Type: deep groove ball bearing, 63 series (medium)
- Bore d: 12 mm (0.4724 in)
- Outside diameter D: 37 mm (1.4567 in)
- Width B: 12 mm (0.4724 in)
- Bore code: 01 = 12 mm (codes 00 to 03 are fixed: 10, 12, 15 and 17 mm)
- Sealed: 6301-2RS; shielded: 6301-ZZ; open: 6301

## Designations by maker

| Maker | Sealed | Shielded |
|---|---|---|
| SKF | 6301-2RSH | 6301-2Z |
| FAG (Schaeffler) | 6301-2RSR | 6301-2ZR |
| NSK | 6301DDU | 6301ZZ |
| NTN | 6301LLU | 6301ZZ |
| Koyo (JTEKT) | 6301-2RS | 6301ZZ |
| Timken | 6301-2RS | see catalogue |

## Same 12 mm bore, other series

| Bearing | Series | OD mm | Width mm |
|---|---|---|---|
| 6801 | thin-section | 21 | 5 |
| 6901 | thin-section | 24 | 6 |
| 6001 | extra-light | 28 | 8 |
| 6201 | light | 32 | 10 |
| 6301 | medium | 37 | 12 |


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

## FAQ

**What size is a 6301 bearing?**
12 mm bore, 37 mm outside diameter and 12 mm wide, which is 0.472 × 1.457 × 0.472 in.

**What does 2RS mean on a 6301 bearing?**
6301-2RS has rubber contact seals on both sides. 6301-ZZ (also written 6301-2Z) has metal shields on both sides. Both have the same 12 × 37 × 12 mm dimensions.

**Is 6301-2RS the same as 6301-ZZ?**
They are the same size and interchangeable in a housing. The sealed 6301-2RS keeps out fine dirt and water better; the shielded 6301-ZZ runs with less friction.

**What is the SKF equivalent of 6301-2RS?**
SKF writes it 6301-2RSH; FAG 6301-2RSR, NSK 6301DDU, NTN 6301LLU and Koyo 6301-2RS. Check the maker's catalogue for the exact seal type.

**What does the number 6301 mean?**
6 is the deep groove ball bearing type, 3 is the medium dimension series, and 01 = 12 mm (codes 00 to 03 are fixed: 10, 12, 15 and 17 mm).

**Which bearings have the same bore as 6301?**
6801, 6901, 6001, 6201 also have a 12 mm bore, with different outside diameters and widths.

Source page: https://machinistcharts.com/bearing/6301/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)