Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When standard steel bearings fail in wet, chemical, or food-contact environments, makers and repair technicians reach for a material that simply doesn't rust. These PP plastic deep groove ball bearings are engineered for hobbyists, robotics builders, and maintenance professionals who need reliable rotation in conditions where metal corrodes, seizes, or contaminates. Whether you're rebuilding a pump, upgrading an RC vehicle, or designing a 3D-printed mechanism, the wrong bearing material can bring your project to a halt.
Each bearing in this series is constructed from polypropylene (PP) plastic with a full-complement or caged ball set, available across a wide range of sizes spanning inner diameters from 3 mm (approx. 0.12 in) to 9 mm (approx. 0.35 in) and outer diameters from 7 mm (approx. 0.28 in) to 26 mm (approx. 1.02 in). Heights range from 2 mm to 8 mm (approx. 0.08–0.31 in). The series covers standard metric designations including 603, 604, 605, 606, 607, 608, 609, 623, 624, 625, 626, 627, 628, 629, 683, 684, 685, 686, 687, 688, 689, 693, 694, 695, 696, 697, 698, and 699.
Typical use cases include corrosion-resistant bearings for aquatic RC models, plastic bearings for food processing equipment, lightweight deep groove bearings for 3D printer carriages, and chemical-resistant miniature bearings for laboratory instruments. The non-metallic construction also eliminates magnetic interference, making these suitable for sensor-adjacent assemblies.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Material | Polypropylene (PP) Plastic |
| Series / Designations | 603, 604, 605, 606, 607, 608, 609, 623, 624, 625, 626, 627, 628, 629, 683, 684, 685, 686, 687, 688, 689, 693, 694, 695, 696, 697, 698, 699 |
| Inner Diameter (ID) Range | 3 mm – 9 mm (approx. 0.12 – 0.35 in) |
| Outer Diameter (OD) Range | 7 mm – 26 mm (approx. 0.28 – 1.02 in) |
| Height Range | 2 mm – 8 mm (approx. 0.08 – 0.31 in) |
| Exact Dimensions | See variant options |
| Load Rating | See variant options |
| Max RPM | See variant options |
| Sealing / Shielding | Open (unshielded) |
| Corrosion Resistance | Water, mild acids, mild alkalis |
| Operating Temperature | Typically –10°C to +80°C (14°F to 176°F) |
| Pack Quantity Options | 1 Pcs / 2 Pcs / 5 Pcs / 10 Pcs |
Match the bearing designation to your housing bore and shaft diameter. The size format is ID × OD × Height in mm — for example, 608 (8×22×7mm) means an 8 mm shaft, 22 mm housing bore, and 7 mm width. Measure your existing bearing or housing with calipers before ordering, and select the matching variant from the dropdown above.
PP plastic bearings are well-suited for light to moderate radial loads in low-to-medium speed applications such as RC vehicles, 3D printers, small pumps, and hobby robotics. They are not recommended for heavy industrial loads, high-impact applications, or sustained high-speed operation that would be better served by steel or ceramic bearings.
Polypropylene offers good resistance to water, dilute acids, dilute alkalis, alcohols, and many aqueous solutions. It is not recommended for use with concentrated oxidizing acids, aromatic hydrocarbons, or chlorinated solvents. If your application involves aggressive chemicals, please verify PP compatibility with your specific media before ordering.
Yes — the outer dimensions (ID, OD, Height) follow the same standard metric bearing dimensions as their steel counterparts. They will fit the same housing and shaft. However, note that load capacity and maximum RPM differ from steel bearings, so confirm your application's requirements are within the plastic bearing's operating range.
Yes. PP plastic bearings are an excellent choice for wet environments, including aquatic RC models, water pumps, irrigation equipment, and marine hobby applications. Unlike steel bearings, they will not rust or seize when exposed to water or moisture. For fully submerged or high-pressure water applications, verify the specific load and speed requirements.
Select the pack quantity that matches your project needs. A 1-piece pack is ideal for a single replacement or prototype test. A 2-piece pack suits paired-axis builds. A 5-piece pack is practical for small batch projects or to keep a spare on hand. A 10-piece pack offers the best per-unit value for workshop stock or multi-axis builds such as 3D printers and CNC machines.
Polypropylene bearings are typically rated for use between –10°C and +80°C (14°F to 176°F). Sustained exposure to temperatures above 80°C may cause deformation or accelerated wear. For high-temperature environments, consider ceramic or stainless steel alternatives.
