NSK 6406-ZZ Bearing — Specifications, Dimensions & Cross-Reference

The NSK 6406-ZZ is a deep groove ball bearing double metal shielded manufactured by NSK. It belongs to the 6400 series and features dimensions of 30 × 90 × 23 mm (bore × OD × width). This bearing has a dynamic load rating of 47,500 N and a static load rating of 24,500 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	30 mm
Outside Diameter (D)	90 mm
Width (B)	23 mm
Weight	0.71 kg

Performance
Dynamic Load Rating (Cr)	47,500 N
Static Load Rating (C₀r)	24,500 N
Limiting Speed (Grease)	8,000 rpm
Limiting Speed (Oil)	10,000 rpm

💡 Application Note: The 6400 series bearings are commonly used in heavy machinery, large industrial gearboxes, and high-load conveyor systems. 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 — 6406-ZZ Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 6406-ZZ. All share identical dimensions (30×90×23mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 6406-ZZ ✦	47,500	24,500
Timken	Timken 6406-ZZ	47,500	24,500
SKF	SKF 6406-ZZ	47,500	24,500
NTN	NTN 6406-ZZ	47,500	24,500
NACHI	NACHI 6406-ZZ	47,500	24,500
KOYO	KOYO 6406-ZZ	47,500	24,500
FAG	FAG 6406-ZZ	47,500	24,500
Timken	Timken 6406-ZZ	47,500	24,500
NTN	NTN 6406-ZZ	47,500	24,500
SKF	SKF 6406-ZZ	47,500	24,500

Available Variants

The NSK 6406 base bearing is available in these configurations:

NSK 6406-NR

Open with snap ring

NSK 6406-ZZ-C3

Double shielded, C3 clearance

NSK 6406-2RS-C3

Double sealed, C3 clearance

NSK 6406-C3

Open, C3 clearance

NSK 6406-2Z

Double metal shielded (ISO)

NSK 6406-2RS

Double rubber sealed

NSK 6406

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 6406-ZZ?

The NSK 6406-ZZ has a bore diameter of 30mm, outside diameter of 90mm, and width of 23mm. It weighs 0.71kg.

What is the load capacity of the NSK 6406-ZZ?

The dynamic load rating (Cr) is 47,500 N and the static load rating (C₀r) is 24,500 N. The maximum recommended speed is 8,000 rpm with grease lubrication or 10,000 rpm with oil lubrication.

What bearings are equivalent to NSK 6406-ZZ?

The 6406-ZZ is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 30×90×23mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.