KOYO 51103-ZZ-C3 Bearing — Specifications, Dimensions & Cross-Reference

The KOYO 51103-ZZ-C3 is a thrust ball bearing double metal shielded manufactured by KOYO. It belongs to the 51100 series and features dimensions of 17 × 30 × 9 mm (bore × OD × width). This bearing has a dynamic load rating of 8,830 N and a static load rating of 6,240 N, making it suitable for light-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	17 mm
Outside Diameter (D)	30 mm
Width (B)	9 mm
Weight	0.026 kg

Performance
Dynamic Load Rating (Cr)	8,830 N
Static Load Rating (C₀r)	6,240 N
Limiting Speed (Grease)	8,500 rpm
Limiting Speed (Oil)	11,000 rpm

💡 Application Note: The 51100 series bearings are commonly used in automotive steering mechanisms, machine tool tables, and applications with pure axial loads. The -ZZ suffix indicates double metal shields, offering good protection while maintaining lower friction than rubber seals — suitable for higher speed applications.

Brand Cross-Reference — 51103-ZZ-C3 Equivalents

The following bearings from other manufacturers are interchangeable with the KOYO 51103-ZZ-C3. All share identical dimensions (17×30×9mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
KOYO	KOYO 51103-ZZ-C3 ✦	8,830	6,240
Timken	Timken 51103-ZZ-C3	8,830	6,240
SKF	SKF 51103-ZZ-C3	8,830	6,240
NACHI	NACHI 51103-ZZ-C3	8,830	6,240
Timken	Timken 51103-ZZ-C3	8,830	6,240
FAG	FAG 51103-ZZ-C3	8,830	6,240
NSK	NSK 51103-ZZ-C3	8,830	6,240
SKF	SKF 51103-ZZ-C3	8,830	6,240
NTN	NTN 51103-ZZ-C3	8,830	6,240

Available Variants

The KOYO 51103 base bearing is available in these configurations:

KOYO 51103-ZZ

Double metal shielded

KOYO 51103-NR

Open with snap ring

KOYO 51103-C3

"Open

KOYO 51103-2Z

Double metal shielded (ISO)

KOYO 51103-2RS-C3

"Double sealed

KOYO 51103-2RS

Double rubber sealed

KOYO 51103

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the KOYO 51103-ZZ-C3?

The KOYO 51103-ZZ-C3 has a bore diameter of 17mm, outside diameter of 30mm, and width of 9mm. It weighs 0.026kg.

What is the load capacity of the KOYO 51103-ZZ-C3?

The dynamic load rating (Cr) is 8,830 N and the static load rating (C₀r) is 6,240 N. The maximum recommended speed is 8,500 rpm with grease lubrication or 11,000 rpm with oil lubrication.

What bearings are equivalent to KOYO 51103-ZZ-C3?

The 51103-ZZ-C3 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 17×30×9mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.