What are the dimensions of this deep groove ball bearing?

The bearing has an inside diameter of 4 mm, an outside diameter of 9 mm, and a width of 4 mm.

What does the 2Z suffix indicate?

The 2Z designation means the ball bearing is equipped with metal shields on both sides.

What radial internal clearance does this SKF bearing have?

This bearing has normal radial internal clearance (designated as CN).

Is this ball bearing suitable for high-temperature applications?

No, this specific model is not designed for high temperatures.

What loads can the SKF 638/4-2Z accommodate?

As a single-row deep groove ball bearing, it accommodates both radial and axial loads in both directions.

SKF 638/4-2Z single-row groove ball bearing cylindrical 4x9x4 mm

Supplier number: SKF 638/4-2Z | EAN 7316570636048

Recommended Retail Price €31.51

15.60 tax incl.

€12.89 excl. VAT (incl. all environmental contributions)

On stock - immediately available

Ordered before 20:00 - delivered as of 17/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL
Delivered from Belgium

↓ Documents (1) ✆ Talk to a specialist

Smooth rotation with Skf

Practical benefits

Dual metal shield protection: Metal shields on both sides keep dust out while retaining grease for extended service life.
Optimized for high speeds: You benefit from low friction and reduced heat generation, ensuring quiet operation under demanding rotational speeds.
Versatile bidirectional load handling: You easily accommodate both radial and axial forces within tight spaces of 4X9X4 mm.

In a nutshell

The right choise for

With the Skf 638/4-2Z single-row deep groove ball bearing, you ensure smooth, reliable rotation in compact assemblies. Measuring 4X9X4 mm with a cylindrical bore, this steel miniature bearing easily accommodates both radial and axial loads in either direction. Dual metal shields (2Z) keep dust and debris out while retaining grease inside, maximizing service life and minimizing maintenance. Featuring normal radial internal clearance (CN) and low friction, it operates quietly with minimal heat generation at high rotational speeds, making it ideal for small electric motors, robotics, precision instruments, and model making.

Product information FAQ

€15.60

In stock - tax incl.

Key features according to our expert

Inner diameter: 4 mm
Width: 4 mm
Number of rows: 1
Sealing (bearing): Sealed on both sides
Material (bearing seal): Metal
Radial clearance: CN (Normal)
Material (bearing): Steel
Bore type: Cylindrical
High temperature: No
Outer diameter: 9 mm

Product description

Single row deep groove ball bearings with seals or shields are particularly versatile, have low friction and are optimized for low noise and low vibration, which enables high rotational speeds. They accommodate radial and axial loads in both directions, are easy to mount, and require less maintenance than many other bearing types. The integral sealing can significantly prolong bearing service life because it keeps lubricant in the bearings and contaminants out.

Integral sealing prolongs bearing service life
Simple, versatile and robust design
Low friction and high-speed capability
Accommodate radial and axial loads in both directions
Require little maintenance

Documents

⤓ Technical data sheet PDF

All Features

Inner diameter: 4 mm
Width: 4 mm
Number of rows: 1
Sealing (bearing): Sealed on both sides
Material (bearing seal): Metal
Radial clearance: CN (Normal)
Material (bearing): Steel
Bore type: Cylindrical
High temperature: No
Outer diameter: 9 mm
Matched arrangement: No
Tolerance class: Normal
Radial internal clearance: CN
Basic static load rating: 0.12
Material, bearing: Bearing steel
Relubrication feature: Without
Reference speed: 140000
Lubricant: Grease
Sealing type: Non-contact
Locating feature, bearing outer ring: None
Filling slots: Without
Coating: Without
Sealing: Shield on both sides
Limiting speed: 70000
Bore diameter: 4
Basic dynamic load rating: 0.42
Outer diameter: 9

Brand SKF
01011526
EAN 7316570636048
Supplier number SKF 638/4-2Z

Frequently asked questions about this product

Answered by specialists

What are the dimensions of this deep groove ball bearing?: The bearing has an inside diameter of 4 mm, an outside diameter of 9 mm, and a width of 4 mm.
What does the 2Z suffix indicate?: The 2Z designation means the ball bearing is equipped with metal shields on both sides.
What radial internal clearance does this SKF bearing have?: This bearing has normal radial internal clearance (designated as CN).
Is this ball bearing suitable for high-temperature applications?: No, this specific model is not designed for high temperatures.
What loads can the SKF 638/4-2Z accommodate?: As a single-row deep groove ball bearing, it accommodates both radial and axial loads in both directions.