6303 Deep Groove Ball Bearing – Versatile and Reliable for General Machinery and Motor Drives | 17×47×14 Mm
The 6303 is a Medium Series Deep Groove Ball Bearing in a standard open design, renowned for its balanced performance and wide applicability. Engineered without integral seals or shields, it offers maximum design flexibility and is ideal for applications where the bearing is incorporated into a pre-lubricated or regularly serviced assembly. With a 17 mm bore, a 47 mm outer diameter, and a 14 mm width, this bearing provides an optimal combination of compactness, load capacity, and speed capability for a diverse range of industrial and automotive uses.
6303 Deep Groove Ball Bearing 17×47×14 mm | ISO 63 Series – Medium | Open Type
Built on a fundamental deep groove design, this bearing enables smooth and efficient operation at speeds up to 18,000 r/min (Oil). It is adept at handling moderate radial loads and light axial loads from both directions. The open configuration facilitates optimal lubrication flow and allows for easy integration into various mechanical systems, establishing the 6303 as a highly versatile and dependable component in general engineering.

Suited for a broad spectrum of light to medium-duty applications across multiple industries:
As part of the widely used 63 series, the 6303 offers an excellent balance between cross-sectional size, load rating, and speed capability, making it a versatile "go-to" choice for many design engineers.
The standard open construction allows for easy initial lubrication, compatibility with various greases or oils, and simple integration into housings that provide their own sealing, offering maximum application flexibility.
Manufactured from high-grade chrome steel (GCr15/SAE 52100) with precision-ground raceways, it ensures smooth rotation, low operational noise, and reliable long-term performance under typical operating conditions.
| Bearing Type | Single Row Deep Groove Ball Bearing |
| ISO Dimension Series | 63 Series – Medium |
| Basic Designation | 6303 |
| Suffix | Open (Standard) |
| Bore Diameter (d) | 17 mm |
| Outer Diameter (D) | 47 mm |
| Width (B) | 14 mm |
| Material (Races & Balls) | Chrome Steel (GCr15 / SAE 52100) |
| Precision Class | Standard / P5 Grade Available |
| Cage Material | Steel Stamped |
| Dynamic Load Rating (Cʳ) | 13.5 kN |
| Static Load Rating (C₀ʳ) | 6.55 kN |
| Limiting Speed (Grease) | 15,000 r/min |
| Limiting Speed (Oil) | 18,000 r/min |
| Weight (approx.) | 0.11 kg |
Common manufacturer equivalents include:
The 6303 is the standard open variant, providing the baseline for customization. For applications requiring built-in protection, the 6303-2RS (double rubber contact seals) or 6303-ZZ (double metal shields) are the recommended sealed counterparts for contaminated or specific speed environments.
"The 6303 open deep groove ball bearing is a cornerstone of general machine design, offering proven versatility, reliability, and easy integration for countless motor, drive, and machinery applications."
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Details
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Details
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Details
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Details
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Details
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