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6203 Series Radial Ball Bearing – Dimensional Specification and Configuration Notes

Bearing Code: 6203 / 6203ZZ

The 6203 series ball bearing belongs to the category of standardized radial rolling bearings with a deep raceway profile.
This model is defined primarily by its fixed dimensional parameters and optional sealing structures rather than by a single application scenario.

Two common configurations are supplied under the same dimensional code:

6203 – open structure

6203ZZ – metal-shielded structure on both sides

Standard Dimensional Definition

All bearings identified as 6203 or 6203ZZ conform to the following size data:

Inner diameter (d): 17 mm

Outer diameter (D): 40 mm

Width (B): 12 mm

This dimensional combination is internationally recognized and allows the bearing to be installed in housings designed for the 6203 size group without modification.

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Internal Structure Description

The bearing uses a single-row deep groove configuration, where the curvature of the raceways closely matches the ball diameter.
This geometry supports continuous rotational motion and provides consistent alignment during operation.

For the 6203ZZ deep groove ball bearing, steel shields are integrated on both sides of the bearing ring assembly. These shields act as a physical barrier against external particles and assist in maintaining internal lubrication.

Material and Manufacturing Characteristics

Bearing rings and rolling elements are produced from bearing-grade steel

Cage structure is designed to maintain uniform ball spacing

Raceway surfaces are finished for smooth rolling contact

Shield components (ZZ version) are metallic and non-contact type

These characteristics ensure dimensional stability and repeatable performance within standard operating conditions.

Model Identification and Variant Explanation

Model Code	Structural Difference
6203	Open bearing, no shields
6203ZZ	Double metal shielded bearing

Despite the difference in closure design, both models maintain identical bore, outside diameter, and width.

Installation and Compatibility Notes

The 6203 size deep groove ball bearing is frequently selected in systems where shaft diameter is 17 mm and compact radial support is required.
Because the bearing dimensions are standardized, replacement and interchangeability are straightforward across compatible assemblies.

Typical equipment categories include rotating shafts, compact drive units, and enclosed mechanical modules.