KOYO 6404-2Z Bearing — Specifications, Dimensions & Cross-Reference

The KOYO 6404-2Z is a deep groove ball bearing double metal shielded manufactured by KOYO. It belongs to the 6400 series and features dimensions of 20 × 72 × 19 mm (bore × OD × width). This bearing has a dynamic load rating of 31,000 N and a static load rating of 15,200 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)20 mm
Outside Diameter (D)72 mm
Width (B)19 mm
Weight0.399 kg
Performance
Dynamic Load Rating (Cr)31,000 N
Static Load Rating (C₀r)15,200 N
Limiting Speed (Grease)9,500 rpm
Limiting Speed (Oil)13,000 rpm
💡 Application Note: The 6400 series bearings are commonly used in heavy machinery, large industrial gearboxes, and high-load conveyor systems. The -2Z suffix indicates double metal shields, offering good protection while maintaining lower friction than rubber seals — suitable for higher speed applications.

Brand Cross-Reference — 6404-2Z Equivalents

The following bearings from other manufacturers are interchangeable with the KOYO 6404-2Z. All share identical dimensions (20×72×19mm) and comparable load ratings:

BrandPart NumberDynamic Load (N)Static Load (N)
KOYOKOYO 6404-2Z ✦31,00015,200
Timken Timken 6404-2Z 31,000 15,200
SKF SKF 6404-2Z 31,000 15,200
NTN NTN 6404-2Z 31,000 15,200
NACHI NACHI 6404-2Z 31,000 15,200
FAG FAG 6404-2Z 31,000 15,200
Timken Timken 6404-2Z 31,000 15,200
NSK NSK 6404-2Z 31,000 15,200
NTN NTN 6404-2Z 31,000 15,200
SKF SKF 6404-2Z 31,000 15,200

Available Variants

The KOYO 6404 base bearing is available in these configurations:

KOYO 6404-ZZ-C3
"Double shielded
KOYO 6404-ZZ
Double metal shielded
KOYO 6404-NR
Open with snap ring
KOYO 6404-C3
"Open
KOYO 6404-2RS-C3
"Double sealed
KOYO 6404-2RS
Double rubber sealed
KOYO 6404
Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the KOYO 6404-2Z?

The KOYO 6404-2Z has a bore diameter of 20mm, outside diameter of 72mm, and width of 19mm. It weighs 0.399kg.

What is the load capacity of the KOYO 6404-2Z?

The dynamic load rating (Cr) is 31,000 N and the static load rating (C₀r) is 15,200 N. The maximum recommended speed is 9,500 rpm with grease lubrication or 13,000 rpm with oil lubrication.

What bearings are equivalent to KOYO 6404-2Z?

The 6404-2Z is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 20×72×19mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.