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When standard steel bearings corrode, seize, or interfere with sensitive equipment, engineers and DIY builders turn to PP plastic deep groove ball bearings with glass rolling elements. Whether you are designing a food-processing conveyor, a chemical-exposure fixture, or a lightweight RC mechanism, metal contamination and rust are not options you can afford.
These PP plastic deep groove ball bearings feature polypropylene (PP) inner and outer rings paired with precision glass balls. The bore (ID) ranges from 3 mm to 55 mm (~0.12 in to ~2.17 in) and the outer diameter (OD) spans 7 mm to 100 mm (~0.28 in to ~3.94 in), covering series 603 through 6815. Width varies by series, typically 2 mm to 21 mm (~0.08 in to ~0.83 in). Available individually or in packs of 10 for project and maintenance stocking.
Typical applications include aquatic and marine equipment where salt-water exposure would destroy steel bearings, laboratory instruments requiring non-magnetic and non-conductive rotating elements, lightweight drone and RC vehicle builds where every gram matters, and food-grade or cleanroom machinery where metal particle contamination must be eliminated.
| Bearing Type | Deep Groove Ball Bearing (Open, Non-Contact) |
|---|---|
| Ring Material | Polypropylene (PP) Plastic |
| Rolling Element Material | Precision Glass Balls |
| Bore Diameter (ID) | 3 mm – 55 mm (approx. 0.12 in – 2.17 in) |
| Outer Diameter (OD) | 7 mm – 100 mm (approx. 0.28 in – 3.94 in) |
| Width | See variant options (typically 2 mm – 21 mm) |
| Available Series | 603, 604, 605, 606, 607, 608, 609, 623, 624, 625, 626, 627, 628, 629, 683–689, 693–699, 6200–6211, 6800–6815, 6900–6907, 6000–6010 |
| Sealing / Shielding | Open (no seal or shield) |
| Lubrication | Contact us to confirm (dry or light grease depending on application) |
| Operating Temperature | Typically –10°C to +80°C (PP material limit; verify for your application) |
| Magnetic Properties | Non-magnetic |
| Electrical Properties | Non-conductive |
| Pack Quantity | 1 Pcs or 10 Pcs (see variant options) |
| Dimensional Standard | ISO Metric Deep Groove Ball Bearing |
Match the bore (ID) to your shaft diameter and the outer diameter (OD) to your housing bore. The variant name lists the bearing series number followed by ID × OD × Width in millimeters — for example, "6204/20x47x14mm" means ID 20 mm, OD 47 mm, width 14 mm. Measure your shaft and housing with calipers before ordering to avoid returns.
PP plastic and glass bearings are designed for light to moderate radial loads in low-to-medium speed applications. They are not a direct replacement for steel bearings in high-load, high-speed, or high-temperature environments. For applications requiring heavy radial or axial loads, consult a mechanical engineer or contact us to confirm suitability.
Polypropylene rings resist water, seawater, mild acids, and many alkalis. Glass balls are chemically inert to most common substances. This combination makes these bearings well-suited for aquatic, marine, and light chemical-exposure environments where steel bearings would rust or corrode. For aggressive solvents or concentrated acids, contact us to confirm compatibility.
Yes. The bore and OD dimensions follow ISO metric deep groove ball bearing standards, so they fit standard metric housings and shafts of the same nominal size. Always verify the exact dimensions listed in the variant name against your hardware, as tolerances between PP plastic and steel bearings may differ slightly.
PP plastic and glass construction eliminates metallic particle contamination, making these bearings a common choice for food-processing equipment, laboratory instruments, and cleanroom machinery. However, food-grade certification requirements vary by jurisdiction and application. Contact us to confirm if specific regulatory compliance documentation is needed for your use case.
The 1 Pcs option is ideal for prototyping, evaluation, or single-unit repairs. The 10 Pcs pack offers a lower per-unit cost and is recommended for production runs, maintenance stock, or projects requiring multiple bearings of the same size. Compare the per-piece price between the two quantity variants before adding to cart.
Polypropylene begins to soften at approximately 80°C–100°C (176°F–212°F) under sustained load. For most ambient-temperature applications this is not a concern, but these bearings are not suitable for high-temperature environments such as ovens, steam equipment, or applications where bearing friction itself generates significant heat. If your application exceeds 60°C operating temperature, contact us to confirm suitability.
