609 bearing dimensions
A 609 bearing is 9 mm bore × 24 mm outside diameter × 7 mm wide (0.354 × 0.945 × 0.276 in). The sealed version is 609-2RS; the shielded version is 609-ZZ.
609 at a glance
Boundary dimensions in millimetres and inches, and the common closure designations.
- Bore, d
- 9 mm 0.3543"
- Outside diameter, D
- 24 mm 0.9449"
- Width, B
- 7 mm 0.2756"
- Section height, (D − d)/2
- 7.5 mm 0.2953"
- Series
- 60 series extra-light
- Bore code
- 9 Under 10 mm bore the last digit is the bore itself: 9 = 9 mm
- Sealed, both sides
- 609-2RS
- Shielded, both sides
- 609-ZZ
- Open
- 609 no closures; any version may add C3 for extra internal clearance
Reading the number 609
Every deep groove ball bearing number follows the same pattern: type, dimension series and bore code, then suffixes.
Seals, shields and suffixes
Suffixes add closures and internal clearance. They do not change the boundary dimensions: a sealed and an open bearing of the same number are interchangeable in size.
| Suffix | Meaning | 609 example |
|---|---|---|
| Open (no suffix) | No seals or shields. Can be relubricated, or run in an oil bath; the housing needs its own seal against dirt. | 609 |
| Z | One metal shield, on one side only. | 609-Z |
| ZZ, 2Z | Metal shields on both sides. Non-contact, so low friction; keeps out larger dirt. Usually greased for life. | 609-ZZ |
| RS | One rubber contact seal, on one side only. | 609-RS |
| 2RS, 2RS1, 2RSH, 2RSR, DDU, LLU | Rubber contact seals on both sides. Better than shields against fine dirt and splashing water, with a little more friction. Usually greased for life. | 609-2RS |
| C3 | Radial internal clearance greater than normal (CN). Used with tight shaft or housing fits, or where the inner ring runs hotter than the outer ring. | 609-2RS C3 |
609 in other brands
The sealed and shielded versions as each maker writes them. All share the same boundary dimensions.
| Maker | Sealed both sides | Shielded both sides |
|---|---|---|
| SKF | 609-2RSH | 609-2Z |
| FAG (Schaeffler) | 609-2RSR | 609-2ZR |
| NSK | 609DDU | 609ZZ |
| NTN | 609LLU | 609ZZ |
| Koyo (JTEKT) | 609-2RS | 609ZZ |
| Timken | 609-2RS | see catalogue |
Seal designs and suffixes vary by maker, size range and product generation, for example contact versus low-friction seals. Confirm the exact designation in the maker's catalogue before ordering.
Same 9 mm bore, other series
Bearings that fit the same shaft. A heavier series carries more load in a bigger housing bore; a thin-section series saves space and weight.
| Bearing | Series | OD | Width | Section | vs 609 |
|---|---|---|---|---|---|
| 609 | extra-light | 24 mm | 7 mm | 7.5 mm | this bearing |
| 629 | light | 26 mm | 8 mm | 8.5 mm | +2 mm OD, +1 mm wide |
Miniature bearings
Common questions
What size is a 609 bearing?
9 mm bore, 24 mm outside diameter and 7 mm wide, which is 0.354 × 0.945 × 0.276 in.
What does 2RS mean on a 609 bearing?
609-2RS has rubber contact seals on both sides. 609-ZZ (also written 609-2Z) has metal shields on both sides. Both have the same 9 × 24 × 7 mm dimensions.
Is 609-2RS the same as 609-ZZ?
They are the same size and interchangeable in a housing. The sealed 609-2RS keeps out fine dirt and water better; the shielded 609-ZZ runs with less friction.
What is the SKF equivalent of 609-2RS?
SKF writes it 609-2RSH; FAG 609-2RSR, NSK 609DDU, NTN 609LLU and Koyo 609-2RS. Check the maker's catalogue for the exact seal type.
What does the number 609 mean?
6 is the deep groove ball bearing type, 0 is the extra-light dimension series, and under 10 mm bore the last digit is the bore itself: 9 = 9 mm.
Which bearings have the same bore as 609?
629 also have a 9 mm bore, with different outside diameters and widths.