NSK 6405-ZZ Bearing — Specifications, Dimensions & Cross-Reference

The NSK 6405-ZZ is a deep groove ball bearing double metal shielded manufactured by NSK. It belongs to the 6400 series and features dimensions of 25 × 80 × 21 mm (bore × OD × width). This bearing has a dynamic load rating of 35,800 N and a static load rating of 19,300 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	25 mm
Outside Diameter (D)	80 mm
Width (B)	21 mm
Weight	0.54 kg

Performance
Dynamic Load Rating (Cr)	35,800 N
Static Load Rating (C₀r)	19,300 N
Limiting Speed (Grease)	8,500 rpm
Limiting Speed (Oil)	11,000 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 — 6405-ZZ Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 6405-ZZ. All share identical dimensions (25×80×21mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 6405-ZZ ✦	35,800	19,300
Timken	Timken 6405-ZZ	35,800	19,300
SKF	SKF 6405-ZZ	35,800	19,300
NTN	NTN 6405-ZZ	35,800	19,300
NACHI	NACHI 6405-ZZ	35,800	19,300
KOYO	KOYO 6405-ZZ	35,800	19,300
FAG	FAG 6405-ZZ	35,800	19,300
Timken	Timken 6405-ZZ	35,800	19,300
NTN	NTN 6405-ZZ	35,800	19,300
SKF	SKF 6405-ZZ	35,800	19,300

Available Variants

The NSK 6405 base bearing is available in these configurations:

NSK 6405-NR

Open with snap ring

NSK 6405-ZZ-C3

Double shielded, C3 clearance

NSK 6405-2RS-C3

Double sealed, C3 clearance

NSK 6405-C3

Open, C3 clearance

NSK 6405-2Z

Double metal shielded (ISO)

NSK 6405-2RS

Double rubber sealed

NSK 6405

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 6405-ZZ?

The NSK 6405-ZZ has a bore diameter of 25mm, outside diameter of 80mm, and width of 21mm. It weighs 0.54kg.

What is the load capacity of the NSK 6405-ZZ?

The dynamic load rating (Cr) is 35,800 N and the static load rating (C₀r) is 19,300 N. The maximum recommended speed is 8,500 rpm with grease lubrication or 11,000 rpm with oil lubrication.

What bearings are equivalent to NSK 6405-ZZ?

The 6405-ZZ is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 25×80×21mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.