NSK 7305-NR Bearing — Specifications, Dimensions & Cross-Reference

The NSK 7305-NR is a angular contact ball bearing with snap ring groove manufactured by NSK. It belongs to the 7300 series and features dimensions of 25 × 62 × 17 mm (bore × OD × width). This bearing has a dynamic load rating of 23,400 N and a static load rating of 12,500 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	25 mm
Outside Diameter (D)	62 mm
Width (B)	17 mm
Weight	0.213 kg

Performance
Dynamic Load Rating (Cr)	23,400 N
Static Load Rating (C₀r)	12,500 N
Limiting Speed (Grease)	11,000 rpm
Limiting Speed (Oil)	13,000 rpm

💡 Application Note: The 7300 series bearings are commonly used in heavy-duty machine tool spindles, large pumps, and high-speed turbines. The -NR suffix indicates an external snap ring groove on the outer ring, allowing easy axial location in housing bores.

Brand Cross-Reference — 7305-NR Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 7305-NR. All share identical dimensions (25×62×17mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 7305-NR ✦	23,400	12,500
SKF	SKF 7305-NR	23,400	12,500
NTN	NTN 7305-NR	23,400	12,500
KOYO	KOYO 7305-NR	23,400	12,500
FAG	FAG 7305-NR	23,400	12,500
NACHI	NACHI 7305-NR	23,400	12,500
Timken	Timken 7305-NR	23,400	12,500
NTN	NTN 7305-NR	23,400	12,500
SKF	SKF 7305-NR	23,400	12,500

Available Variants

The NSK 7305 base bearing is available in these configurations:

NSK 7305-ZZ-C3

Double shielded, C3 clearance

NSK 7305-2RS-C3

Double sealed, C3 clearance

NSK 7305-C3

Open, C3 clearance

NSK 7305-2Z

Double metal shielded (ISO)

NSK 7305-ZZ

Double metal shielded

NSK 7305-2RS

Double rubber sealed

NSK 7305

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 7305-NR?

The NSK 7305-NR has a bore diameter of 25mm, outside diameter of 62mm, and width of 17mm. It weighs 0.213kg.

What is the load capacity of the NSK 7305-NR?

The dynamic load rating (Cr) is 23,400 N and the static load rating (C₀r) is 12,500 N. The maximum recommended speed is 11,000 rpm with grease lubrication or 13,000 rpm with oil lubrication.

What bearings are equivalent to NSK 7305-NR?

The 7305-NR is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 25×62×17mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.