NTN 6903-ZZ Bearing — Specifications, Dimensions & Cross-Reference
The NTN 6903-ZZ is a deep groove ball bearing double metal shielded manufactured by NTN. It belongs to the 6900 series and features dimensions of 17 × 30 × 7 mm (bore × OD × width). This bearing has a dynamic load rating of 3,450 N and a static load rating of 2,070 N, making it suitable for light-duty applications.
Technical Specifications
| Dimensions | |
|---|---|
| Bore Diameter (d) | 17 mm |
| Outside Diameter (D) | 30 mm |
| Width (B) | 7 mm |
| Weight | 0.016 kg |
| Performance | |
|---|---|
| Dynamic Load Rating (Cr) | 3,450 N |
| Static Load Rating (C₀r) | 2,070 N |
| Limiting Speed (Grease) | 20,000 rpm |
| Limiting Speed (Oil) | 28,000 rpm |
Brand Cross-Reference — 6903-ZZ Equivalents
The following bearings from other manufacturers are interchangeable with the NTN 6903-ZZ. All share identical dimensions (17×30×7mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| NTN | NTN 6903-ZZ ✦ | 3,450 | 2,070 |
| NTN | NTN 6903-ZZ | 3,450 | 2,070 |
| NACHI | NACHI 6903-ZZ | 3,450 | 2,070 |
| KOYO | KOYO 6903-ZZ | 3,450 | 2,070 |
| FAG | FAG 6903-ZZ | 3,450 | 2,070 |
| Timken | Timken 6903-ZZ | 3,450 | 2,070 |
| NSK | NSK 6903-ZZ | 3,450 | 2,070 |
| SKF | SKF 6903-ZZ | 3,450 | 2,070 |
Available Variants
The NTN 6903 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the NTN 6903-ZZ?
The NTN 6903-ZZ has a bore diameter of 17mm, outside diameter of 30mm, and width of 7mm. It weighs 0.016kg.
What is the load capacity of the NTN 6903-ZZ?
The dynamic load rating (Cr) is 3,450 N and the static load rating (C₀r) is 2,070 N. The maximum recommended speed is 20,000 rpm with grease lubrication or 28,000 rpm with oil lubrication.
What bearings are equivalent to NTN 6903-ZZ?
The 6903-ZZ is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 17×30×7mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.