Part number · Deep groove ball bearing
6203 Bearing – Size, Variants & Stock in Mumbai
6203: a 17 × 40 × 12 mm deep groove ball bearing. Genuine SKF, FAG, NTN, NSK, KOYO and HCH, supplied across India with same or next-day delivery in Mumbai.
The 6203 is a light-series deep groove ball bearing with a 17 mm bore, a 40 mm outside diameter and a width of 12 mm. It is one of the most common small bearings in India, found in electric motors, pumps, fans and household appliances.
Its bore is the one that confuses people. In most bearing numbers you multiply the last two digits by 5 to get the bore, but the first four codes are fixed exceptions: 00 is 10 mm, 01 is 12 mm, 02 is 15 mm and 03 is 17 mm. So a 6203 has a 17 mm bore, not 15 mm. If you are measuring an unmarked bearing and get 17 × 40 × 12 mm, it is almost certainly a 6203.
Within the same 17 mm bore, the 6003 (17 × 35 × 10 mm) is lighter and the 6303 (17 × 47 × 14 mm) heavier. Check the outside diameter before ordering, because only one of them will fit your housing.
6203 dimensions
| Bore (d) | 17 mm |
|---|---|
| Outside diameter (D) | 40 mm |
| Width (B) | 12 mm |
| Weight (open, approx.) | 64–65 g |
Dimensions are the ISO 15 standard size, the same in every brand and seal type. Weight varies slightly by brand, shields and seals.
6203 variants
Every 6203 has the same outside dimensions. What changes is how it is sealed, its internal clearance and its material:
- 6203 (open): no shields or seals. For gearboxes and machines where oil or grease reaches the bearing.
- 6203 ZZ / 2Z: metal shields on both sides, greased for life. For clean, fast-running motors and fans.
- 6203 2RS: rubber seals on both sides (DDU at NSK, LLU at NTN). Better against dust and moisture.
- 6203 C3: internal clearance greater than normal, combined with any of the above (e.g. 6203-2RS-C3). The usual choice for electric motors.
- S6203 / SS6203: stainless steel for wet or corrosive conditions, usually marked with an S or SS prefix (SKF uses W). Supplied on request.
6203 equivalents by brand
Same size, written in each maker’s own style. Tap a brand to see how it numbers its bearings.
| Brand | Open | Shields | Seals | Seals + C3 |
|---|---|---|---|---|
| SKF | 6203 |
6203-2Z |
6203-2RSH |
6203-2RSH/C3 |
| FAG | 6203 |
6203-2ZR |
6203-2RSR |
6203-2RSR-C3 |
| NTN | 6203 |
6203ZZ |
6203LLU |
6203LLUC3 |
| NSK | 6203 |
6203ZZ |
6203DDU |
6203DDUC3 |
| KOYO | 6203 |
6203ZZ |
6203-2RS |
6203-2RS C3 |
| HCH | 6203 |
6203ZZ |
6203-2RS |
6203-2RS C3 |
Where the 6203 is used
- Small electric motors
- Ceiling and table fans
- Monoblock and domestic pumps
- Washing machines and appliances
- Power tools
- Small gearboxes and conveyors
Brands available for 6203
Is your 6203 genuine?
Sizes as popular as the 6203 are among the most counterfeited. Check that the marking on the ring matches the box exactly, that the brand’s own suffix style is used, and be wary of prices far below the market. How to spot a fake bearing.
Questions
6203 bearing: frequently asked
Why does a 6203 bearing have a 17 mm bore and not 15 mm?
The bore codes 00 to 03 are fixed exceptions: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm and 03 = 17 mm. From 04 onwards you multiply by 5. So 6203 means a 17 mm bore.
What size is a 6203 bearing?
A 6203 measures 17 mm bore × 40 mm outside diameter × 12 mm width, whatever the brand or seal type.
Should I use 6203 ZZ or 6203 2RS in a motor?
Use whatever the motor was built with. ZZ (metal shields) suits clean, fast-running motors. 2RS (rubber seals) is better where there is dust or moisture. Most motors also need C3 clearance.
Have a part number, or just a worn-out bearing?
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