Bearings
Ball Bearings 608ZZ-687ZZ | Deep Groove Miniature | Skateboard & 3D Printer
CMP-04578BEAR-00001
£17.99
Bearings
3 products available
Bearings are components that enable rotational or linear movement while reducing friction between moving parts. For industrial applications, selecting the correct industrial bearings is vital for machinery uptime and performance. Compel is a reliable bearing supplier focused on the specific components needed for maintenance, repair, and operations (MRO) in machinery and light equipment.
Our selection centers on deep groove ball bearings, a widely used type suitable for high speeds and both radial and axial loads. We offer standard sizes with rubber seals (2RS) for protection against contaminants, and miniature bearings with metal shields (ZZ) for applications like 3D printers or conveyor rollers. When you need dependable, standard-sized bearings for common industrial tasks, Compel provides a direct source.
Confirming Bearing Dimensions and Type
Most industrial MRO tasks involve replacing a worn bearing with an identical part. The most common of all bearing types is the deep groove ball bearing, designed to handle radial and some axial loads at high speeds. Before ordering, confirm the required dimensions.
The most accurate way to identify a bearing is by the number etched on its side. If this is unreadable, you must measure its three dimensions: inner diameter (ID), outer diameter (OD), and width. For example, a bearing listed as 10x26x8mm has a 10mm inner diameter, a 26mm outer diameter, and is 8mm wide.
- Inner Diameter (ID): The size of the bore, which fits onto the shaft.
- Outer Diameter (OD): The overall dimension, which fits into the housing or component.
- Width: The thickness of the bearing from one face to the other.
Selecting Seals or Shields for Your Application
The suffix on a bearing number, such as 2RS or ZZ, indicates its closure type, which is for its lifespan and performance. This choice depends on the operating environment.
2RS bearings feature two rubber seals. These seals make light contact with the inner ring to provide excellent protection against moisture, dust, and other contaminants. This makes them ideal for general industrial bearings used in machinery where some exposure to debris is expected. The contact seal creates slightly more friction than a shield.
ZZ bearings have two non-contact metal shields. These shields prevent larger particles from entering the bearing without adding rotational friction. This makes them a better choice for higher-speed applications or internal components where the primary contaminant is dust, such as in 3D printers or small motors.
Material Choice: Bearing Steel vs. Stainless Steel
The operating environment also dictates the best material for your bearings. Our selection includes options in both standard bearing steel and stainless steel.
Bearing steel (also known as chrome steel) is the industry standard. It offers high hardness, excellent fatigue resistance, and a high load capacity, making it suitable for most controlled industrial environments.
Stainless steel provides good corrosion resistance. Choose stainless steel for applications with exposure to moisture, humidity, or washdown processes where standard steel would rust. While its load capacity is typically lower than that of bearing steel, its resistance to corrosion is in certain settings.
Buying guide
Choosing Bearings
- What is the difference between a 2RS and a ZZ bearing?
- A 2RS bearing has two rubber seals that make contact with the inner ring, offering superior protection from moisture and fine dust. A ZZ bearing has two non-contact metal shields, which provide good dust protection with lower friction, making it more suitable for high-speed applications.
- How do I find the correct size bearing for my equipment?
- The most reliable method is to use the part number printed on your existing bearing. If that is unavailable, you must precisely measure the shaft diameter (for the inner diameter), the housing bore (for the outer diameter), and the available width. Our listings specify these three dimensions in millimeters, such as 10x26x8mm (ID x OD x Width).
- When should I choose stainless steel over standard bearing steel?
- Select stainless steel bearings for applications exposed to moisture or humidity where corrosion resistance is required. Standard bearing steel offers higher hardness and load capacity but is prone to rust if not used in a dry, protected environment.
- Are these precision bearings suitable for CNC machine spindles?
- Our ball bearings are intended for general industrial and trade use, such as in conveyors, motors, and light-duty equipment. High-precision applications like CNC spindles require a specific tolerance class (ABEC rating). You must check your machine's documentation for the required rating and verify it on the bearing's datasheet.
- Do sealed (2RS) or shielded (ZZ) bearings require lubrication?
- No, these bearings are supplied pre-lubricated with grease for their service life. Attempting to add lubricant can damage the seals and introduce contaminants, leading to premature failure. You should replace the entire bearing when it becomes noisy or worn.