NSK 51105-NR Bearing — Specifications, Dimensions & Cross-Reference

The NSK 51105-NR is a thrust ball bearing with snap ring groove manufactured by NSK. It belongs to the 51100 series and features dimensions of 25 × 42 × 11 mm (bore × OD × width). This bearing has a dynamic load rating of 18,200 N and a static load rating of 14,600 N, making it suitable for medium-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	25 mm
Outside Diameter (D)	42 mm
Width (B)	11 mm
Weight	0.060 kg

Performance
Dynamic Load Rating (Cr)	18,200 N
Static Load Rating (C₀r)	14,600 N
Limiting Speed (Grease)	6,300 rpm
Limiting Speed (Oil)	8,500 rpm

💡 Application Note: The 51100 series bearings are commonly used in automotive steering mechanisms, machine tool tables, and applications with pure axial loads. The -NR suffix indicates an external snap ring groove on the outer ring, allowing easy axial location in housing bores.

Brand Cross-Reference — 51105-NR Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 51105-NR. All share identical dimensions (25×42×11mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 51105-NR ✦	18,200	14,600
Timken	Timken 51105-NR	18,200	14,600
SKF	SKF 51105-NR	18,200	14,600
NACHI	NACHI 51105-NR	18,200	14,600
KOYO	KOYO 51105-NR	18,200	14,600
Timken	Timken 51105-NR	18,200	14,600
FAG	FAG 51105-NR	18,200	14,600
NTN	NTN 51105-NR	18,200	14,600
SKF	SKF 51105-NR	18,200	14,600

Available Variants

The NSK 51105 base bearing is available in these configurations:

NSK 51105-ZZ-C3

Double shielded, C3 clearance

NSK 51105-2RS-C3

Double sealed, C3 clearance

NSK 51105-C3

Open, C3 clearance

NSK 51105-2Z

Double metal shielded (ISO)

NSK 51105-ZZ

Double metal shielded

NSK 51105-2RS

Double rubber sealed

NSK 51105

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 51105-NR?

The NSK 51105-NR has a bore diameter of 25mm, outside diameter of 42mm, and width of 11mm. It weighs 0.060kg.

What is the load capacity of the NSK 51105-NR?

The dynamic load rating (Cr) is 18,200 N and the static load rating (C₀r) is 14,600 N. The maximum recommended speed is 6,300 rpm with grease lubrication or 8,500 rpm with oil lubrication.

What bearings are equivalent to NSK 51105-NR?

The 51105-NR is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 25×42×11mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.