Small Bearings(362)

On this page, “small bearings” generally means compact, precision ball bearings and related hardware sized for tight spaces and light to moderate loads. You’ll see:

• Miniature deep groove ball bearings in sizes like 1x3x1 mm up to 8x22x7 mm and beyond.
• Thrust ball bearings for axial loads in small mechanisms.
• Pillow block units with small bores for easy mounting.
• Loose steel balls for rebuilds and repairs.

Common materials include bearing steel and stainless steel, with open, ZZ (metal shielded), or 2RS (rubber sealed) options. These sizes are often used in 3D printers, small electric motors, skateboards, hobby builds, and crafts. Checking inner diameter, outer diameter, and width helps you match your application.

Based on the items shown, you can find micro bearings as small as 1x3x1 mm (listed in the ID x OD x Width format). That means a 1 mm inner diameter, 3 mm outer diameter, and 1 mm width. You’ll also see other tiny sizes like 2x5x2.5 mm and 3x6x2.5 mm.

• Tip: Measure your shaft first—your bearing’s inner diameter should match it.
• Format reminder: Sizes are typically displayed as ID x OD x W.

Availability can vary by listing, so it’s a good idea to review each product’s specification section for exact dimensions and tolerances before ordering.

You’ll find several small-bearing types on this page, each suited to different needs:

• Deep groove ball bearings: Versatile, low-friction options (open, ZZ, or 2RS) used in motors, rollers, and wheeled products.
• Thrust ball bearings: Compact assemblies for one-direction axial loads in tools and mechanisms.
• Pillow block bearings: Small bore, self-aligning housings that simplify mounting on frames.
• Rotary/turntable bearings: Slim components for light-duty rotation in crafts and DIY projects.
• Loose bearing balls: Replacement steel balls for repairs.

Selecting by type alongside size (ID/OD/width) can help you match performance and fit without over- or under-specifying.

Micro and miniature bearings commonly have inner diameters from about 1 mm to under 10 mm on this page. Examples you’ll see include:

• 1x3x1 mm and 2x5x2.5 mm for ultra-compact builds.
• 3x7x3 mm, 4x9x4 mm, 5x11x5 mm, 6x13x5 mm, 7x14x5 mm.
• 8x16x5 mm, 9x17x5 mm, and the widely used 8x22x7 mm (608).

Sizes are listed as ID x OD x Width. Matching the inner diameter to your shaft is a practical starting point, then confirm outer diameter and width to fit housings or pockets. Reviewing product specs can help you align size, shielding (ZZ/2RS), and material with your project’s environment.

They describe how a small bearing is protected:

• 2RS (rubber sealed): Contact seals help block dust and moisture. This can provide added protection in less-clean environments, though it may introduce slightly higher friction compared to non-contact designs.
• ZZ (metal shielded): Non-contact metal shields offer moderate protection with typically lower friction, suitable for cleaner settings or higher speeds.
• Open: No shields or seals; lowest restriction but exposed to contaminants.

Choosing among 2RS, ZZ, or open often depends on your environment and maintenance plans. If debris exposure is likely, sealed options can help. For speed and efficiency in clean conditions, shielded or open styles may be considered.