NSK 7306-ZZ-C3 Bearing — Specifications, Dimensions & Cross-Reference

The NSK 7306-ZZ-C3 is a angular contact ball bearing double metal shielded manufactured by NSK. It belongs to the 7300 series and features dimensions of 30 × 72 × 19 mm (bore × OD × width). This bearing has a dynamic load rating of 29,600 N and a static load rating of 16,600 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	30 mm
Outside Diameter (D)	72 mm
Width (B)	19 mm
Weight	0.327 kg

Performance
Dynamic Load Rating (Cr)	29,600 N
Static Load Rating (C₀r)	16,600 N
Limiting Speed (Grease)	9,000 rpm
Limiting Speed (Oil)	11,000 rpm

💡 Application Note: The 7300 series bearings are commonly used in heavy-duty machine tool spindles, large pumps, and high-speed turbines. 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 — 7306-ZZ-C3 Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 7306-ZZ-C3. All share identical dimensions (30×72×19mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 7306-ZZ-C3 ✦	29,600	16,600
SKF	SKF 7306-ZZ-C3	29,600	16,600
NTN	NTN 7306-ZZ-C3	29,600	16,600
KOYO	KOYO 7306-ZZ-C3	29,600	16,600
FAG	FAG 7306-ZZ-C3	29,600	16,600
NACHI	NACHI 7306-ZZ-C3	29,600	16,600
Timken	Timken 7306-ZZ-C3	29,600	16,600
SKF	SKF 7306-ZZ-C3	29,600	16,600
NTN	NTN 7306-ZZ-C3	29,600	16,600

Available Variants

The NSK 7306 base bearing is available in these configurations:

NSK 7306-NR

Open with snap ring

NSK 7306-2RS-C3

Double sealed, C3 clearance

NSK 7306-C3

Open, C3 clearance

NSK 7306-2Z

Double metal shielded (ISO)

NSK 7306-ZZ

Double metal shielded

NSK 7306-2RS

Double rubber sealed

NSK 7306

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 7306-ZZ-C3?

The NSK 7306-ZZ-C3 has a bore diameter of 30mm, outside diameter of 72mm, and width of 19mm. It weighs 0.327kg.

What is the load capacity of the NSK 7306-ZZ-C3?

The dynamic load rating (Cr) is 29,600 N and the static load rating (C₀r) is 16,600 N. The maximum recommended speed is 9,000 rpm with grease lubrication or 11,000 rpm with oil lubrication.

What bearings are equivalent to NSK 7306-ZZ-C3?

The 7306-ZZ-C3 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 30×72×19mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.