626 bearing dimensions
A 626 bearing is 6 mm bore × 19 mm outside diameter × 6 mm wide (0.236 × 0.748 × 0.236 in). The sealed version is 626-2RS; the shielded version is 626-ZZ.
626 at a glance
Boundary dimensions in millimetres and inches, and the common closure designations.
- Bore, d
- 6 mm 0.2362"
- Outside diameter, D
- 19 mm 0.7480"
- Width, B
- 6 mm 0.2362"
- Section height, (D − d)/2
- 6.5 mm 0.2559"
- Series
- 62 series light
- Bore code
- 6 Under 10 mm bore the last digit is the bore itself: 6 = 6 mm
- Sealed, both sides
- 626-2RS
- Shielded, both sides
- 626-ZZ
- Open
- 626 no closures; any version may add C3 for extra internal clearance
Reading the number 626
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 | 626 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. | 626 |
| Z | One metal shield, on one side only. | 626-Z |
| ZZ, 2Z | Metal shields on both sides. Non-contact, so low friction; keeps out larger dirt. Usually greased for life. | 626-ZZ |
| RS | One rubber contact seal, on one side only. | 626-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. | 626-2RS |
| 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. | 626-2RS C3 |
626 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 | 626-2RSH | 626-2Z |
| FAG (Schaeffler) | 626-2RSR | 626-2ZR |
| NSK | 626DDU | 626ZZ |
| NTN | 626LLU | 626ZZ |
| Koyo (JTEKT) | 626-2RS | 626ZZ |
| Timken | 626-2RS | 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 6 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 626 |
|---|---|---|---|---|---|
| 606 | extra-light | 17 mm | 6 mm | 5.5 mm | −2 mm OD, same width |
| 626 | light | 19 mm | 6 mm | 6.5 mm | this bearing |
Miniature bearings
Common questions
What size is a 626 bearing?
6 mm bore, 19 mm outside diameter and 6 mm wide, which is 0.236 × 0.748 × 0.236 in.
What does 2RS mean on a 626 bearing?
626-2RS has rubber contact seals on both sides. 626-ZZ (also written 626-2Z) has metal shields on both sides. Both have the same 6 × 19 × 6 mm dimensions.
Is 626-2RS the same as 626-ZZ?
They are the same size and interchangeable in a housing. The sealed 626-2RS keeps out fine dirt and water better; the shielded 626-ZZ runs with less friction.
What is the SKF equivalent of 626-2RS?
SKF writes it 626-2RSH; FAG 626-2RSR, NSK 626DDU, NTN 626LLU and Koyo 626-2RS. Check the maker's catalogue for the exact seal type.
What does the number 626 mean?
6 is the deep groove ball bearing type, 2 is the light dimension series, and under 10 mm bore the last digit is the bore itself: 6 = 6 mm.
Which bearings have the same bore as 626?
606 also have a 6 mm bore, with different outside diameters and widths.