NSK 6320-ZZ Bearing — Specifications, Dimensions & Cross-Reference

The NSK 6320-ZZ is a deep groove ball bearing double metal shielded manufactured by NSK. It belongs to the 6300 series and features dimensions of 100 × 215 × 47 mm (bore × OD × width). This bearing has a dynamic load rating of 174,000 N and a static load rating of 140,000 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	100 mm
Outside Diameter (D)	215 mm
Width (B)	47 mm
Weight	6.350 kg

Performance
Dynamic Load Rating (Cr)	174,000 N
Static Load Rating (C₀r)	140,000 N
Limiting Speed (Grease)	3,000 rpm
Limiting Speed (Oil)	3,600 rpm

💡 Application Note: The 6300 series bearings are commonly used in heavy-duty electric motors, mining equipment, construction machinery, and industrial gearboxes. 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 — 6320-ZZ Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 6320-ZZ. All share identical dimensions (100×215×47mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 6320-ZZ ✦	174,000	140,000
Timken	Timken 6320-ZZ	174,000	140,000
SKF	SKF 6320-ZZ	174,000	140,000
NTN	NTN 6320-ZZ	174,000	140,000
NACHI	NACHI 6320-ZZ	174,000	140,000
KOYO	KOYO 6320-ZZ	174,000	140,000
FAG	FAG 6320-ZZ	174,000	140,000
Timken	Timken 6320-ZZ	174,000	140,000
NTN	NTN 6320-ZZ	174,000	140,000
SKF	SKF 6320-ZZ	174,000	140,000

Available Variants

The NSK 6320 base bearing is available in these configurations:

NSK 6320-NR

Open with snap ring

NSK 6320-ZZ-C3

Double shielded, C3 clearance

NSK 6320-2RS-C3

Double sealed, C3 clearance

NSK 6320-C3

Open, C3 clearance

NSK 6320-2Z

Double metal shielded (ISO)

NSK 6320-2RS

Double rubber sealed

NSK 6320

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 6320-ZZ?

The NSK 6320-ZZ has a bore diameter of 100mm, outside diameter of 215mm, and width of 47mm. It weighs 6.350kg.

What is the load capacity of the NSK 6320-ZZ?

The dynamic load rating (Cr) is 174,000 N and the static load rating (C₀r) is 140,000 N. The maximum recommended speed is 3,000 rpm with grease lubrication or 3,600 rpm with oil lubrication.

What bearings are equivalent to NSK 6320-ZZ?

The 6320-ZZ is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 100×215×47mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.