Timken 6903-C3 Bearing — Specifications, Dimensions & Cross-Reference

The Timken 6903-C3 is a deep groove ball bearing with C3 clearance manufactured by Timken. It belongs to the 6900 series and features dimensions of 17 × 30 × 7 mm (bore × OD × width). This bearing has a dynamic load rating of 3,450 N and a static load rating of 2,070 N, making it suitable for light-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	17 mm
Outside Diameter (D)	30 mm
Width (B)	7 mm
Weight	0.016 kg

Performance
Dynamic Load Rating (Cr)	3,450 N
Static Load Rating (C₀r)	2,070 N
Limiting Speed (Grease)	20,000 rpm
Limiting Speed (Oil)	28,000 rpm

💡 Application Note: The 6900 series bearings are commonly used in office equipment, small electric motors, and light industrial applications. The -C3 suffix indicates greater-than-normal radial internal clearance, recommended for applications with temperature differentials or tight shaft/housing fits.

Brand Cross-Reference — 6903-C3 Equivalents

The following bearings from other manufacturers are interchangeable with the Timken 6903-C3. All share identical dimensions (17×30×7mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
Timken	Timken 6903-C3 ✦	3,450	2,070
NTN	NTN 6903-C3	3,450	2,070
NACHI	NACHI 6903-C3	3,450	2,070
KOYO	KOYO 6903-C3	3,450	2,070
FAG	FAG 6903-C3	3,450	2,070
NSK	NSK 6903-C3	3,450	2,070
SKF	SKF 6903-C3	3,450	2,070
NTN	NTN 6903-C3	3,450	2,070

Available Variants

The Timken 6903 base bearing is available in these configurations:

Timken 6903-NR

Open with snap ring

Timken 6903-ZZ-C3

Double shielded, C3 clearance

Timken 6903-2RS-C3

Double sealed, C3 clearance

Timken 6903-2Z

Double metal shielded (ISO)

Timken 6903-ZZ

Double metal shielded

Timken 6903-2RS

Double rubber sealed

Timken 6903

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the Timken 6903-C3?

The Timken 6903-C3 has a bore diameter of 17mm, outside diameter of 30mm, and width of 7mm. It weighs 0.016kg.

What is the load capacity of the Timken 6903-C3?

The dynamic load rating (Cr) is 3,450 N and the static load rating (C₀r) is 2,070 N. The maximum recommended speed is 20,000 rpm with grease lubrication or 28,000 rpm with oil lubrication.

What bearings are equivalent to Timken 6903-C3?

The 6903-C3 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 17×30×7mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.