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When standard steel bearings corrode, seize, or contaminate a process, engineers and maintenance teams need a reliable alternative. These PP plastic deep groove ball bearings are engineered for applications where moisture, mild acids, alkalis, or hygiene requirements make metallic bearings impractical — from food processing conveyors and aquatic equipment to chemical dosing pumps and laboratory instruments.
Each bearing is constructed from polypropylene (PP) — a semi-crystalline thermoplastic known for its resistance to a broad range of chemicals, low moisture absorption, and lightweight profile. The bore range spans 3 mm to 50 mm (approx. 0.12" to 1.97"), with outer diameters from 7 mm to 80 mm and widths from 2 mm to 18 mm, covering standard series 600, 620, 680, 690, 6000, 6200, 6800, and 6900. All dimensions conform to standard deep groove ball bearing geometry for drop-in compatibility.
Typical use cases include wet-environment conveyor rollers, corrosive-fluid pump shafts, food-grade packaging machinery, aquarium and water treatment equipment, and lightweight robotic or drone frames where weight reduction is critical. The non-magnetic, non-conductive PP construction also suits MRI-adjacent equipment and electrical isolation applications.
| Material | Polypropylene (PP) |
|---|---|
| Bearing Type | Deep Groove Ball Bearing |
| Bore (ID) Range | 3 mm – 50 mm (approx. 0.12" – 1.97") |
| Outer Diameter (OD) Range | 7 mm – 80 mm (approx. 0.28" – 3.15") |
| Width Range | 2 mm – 18 mm (approx. 0.08" – 0.71") |
| Series Covered | 600, 620, 680, 690, 6000, 6200, 6800, 6900 |
| Corrosion Resistance | Resistant to dilute acids, alkalis, moisture |
| Electrical Properties | Non-conductive, non-magnetic |
| Operating Temperature | Typically –10°C to +80°C (14°F to 176°F) |
| Load Capacity | Light to moderate radial loads (see variant options) |
| Lubrication | See variant options / Contact us to confirm |
| Pack Quantities | 1 pcs / 5 pcs / 10 pcs |
Match the bore (ID) to your shaft diameter, the outer diameter (OD) to your housing bore, and the width to your housing depth. All dimensions are listed in the variant name as ID × OD × Width in mm. For example, "608 (8×22×7mm)" has an 8 mm bore, 22 mm OD, and 7 mm width. If you are replacing an existing bearing, the series number (e.g., 608) is usually stamped on the bearing face.
PP plastic bearings are rated for light to moderate radial loads at low-to-medium speeds. They are not suitable for heavy shock loads, high-speed spindle applications, or sustained axial loading. For reference, dynamic load ratings are typically 10–40% of equivalent steel bearings of the same series. If your application involves significant load or speed, contact us to confirm suitability before ordering.
Yes. Polypropylene offers good resistance to dilute acids (e.g., hydrochloric, sulfuric at low concentrations), dilute alkalis, alcohols, and water. It is not recommended for use with concentrated oxidizing acids, aromatic hydrocarbons (e.g., benzene, toluene), or chlorinated solvents. If your application involves specific chemicals, please contact us with the chemical name and concentration for compatibility confirmation.
In most cases, yes — provided the bore, OD, and width match. These bearings follow standard deep groove ball bearing envelope dimensions, so a 608 PP bearing will fit the same housing as a steel 608. However, PP bearings have lower load and speed ratings than steel, so confirm your application requirements before substituting in high-load or high-speed machinery.
Polypropylene begins to soften above approximately 80°C (176°F) and becomes brittle below approximately –10°C (14°F). For applications outside this range — such as steam sterilization, cryogenic environments, or continuous high-temperature exposure — consider PEEK or ceramic bearing alternatives instead.
PP plastic bearings are often used dry or with water as a lubricant in wet environments, which is one of their key advantages over steel. If your application runs dry at higher speeds, a small amount of PTFE-based or silicone-based grease compatible with polypropylene can extend service life. Avoid petroleum-based greases, which may degrade PP over time.
Available series include 600 (e.g., 603–609), 620 (e.g., 623–629), 680 (e.g., 683–689), 690 (e.g., 693–699), 6000 (e.g., 6000–6010), 6200 (e.g., 6200–6208), 6800 (e.g., 6800–6807), and 6900 (e.g., 6900–6907). The series number encodes the bore size: for 6000-series, the last two digits give the bore in mm (e.g., 6204 = 20 mm bore). For 600-series, the last digit gives the bore (e.g., 608 = 8 mm bore). Select your size from the variant dropdown above.
