NSK 6404-2RS Bearing — Specifications, Dimensions & Cross-Reference

The NSK 6404-2RS is a deep groove ball bearing double rubber sealed manufactured by NSK. 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
Weight	0.399 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 -2RS suffix indicates double rubber contact seals, providing excellent protection against dust, moisture, and contaminants — ideal for harsh operating environments.

Brand Cross-Reference — 6404-2RS Equivalents

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

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 6404-2RS ✦	31,000	15,200
Timken	Timken 6404-2RS	31,000	15,200
SKF	SKF 6404-2RS	31,000	15,200
NTN	NTN 6404-2RS	31,000	15,200
NACHI	NACHI 6404-2RS	31,000	15,200
KOYO	KOYO 6404-2RS	31,000	15,200
FAG	FAG 6404-2RS	31,000	15,200
Timken	Timken 6404-2RS	31,000	15,200
SKF	SKF 6404-2RS	31,000	15,200
NTN	NTN 6404-2RS	31,000	15,200

Available Variants

The NSK 6404 base bearing is available in these configurations:

NSK 6404-NR

Open with snap ring

NSK 6404-ZZ-C3

Double shielded, C3 clearance

NSK 6404-2RS-C3

Double sealed, C3 clearance

NSK 6404-C3

Open, C3 clearance

NSK 6404-2Z

Double metal shielded (ISO)

NSK 6404-ZZ

Double metal shielded

NSK 6404

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 6404-2RS?

The NSK 6404-2RS 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 NSK 6404-2RS?

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 NSK 6404-2RS?

The 6404-2RS 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.