NSK 51109-C3 Bearing — Specifications, Dimensions & Cross-Reference

The NSK 51109-C3 is a thrust ball bearing with C3 clearance manufactured by NSK. It belongs to the 51100 series and features dimensions of 45 × 65 × 14 mm (bore × OD × width). This bearing has a dynamic load rating of 29,600 N and a static load rating of 28,000 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	45 mm
Outside Diameter (D)	65 mm
Width (B)	14 mm
Weight	0.130 kg

Performance
Dynamic Load Rating (Cr)	29,600 N
Static Load Rating (C₀r)	28,000 N
Limiting Speed (Grease)	4,300 rpm
Limiting Speed (Oil)	5,600 rpm

💡 Application Note: The 51100 series bearings are commonly used in automotive steering mechanisms, machine tool tables, and applications with pure axial loads. The -C3 suffix indicates greater-than-normal radial internal clearance, recommended for applications with temperature differentials or tight shaft/housing fits.

Brand Cross-Reference — 51109-C3 Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 51109-C3. All share identical dimensions (45×65×14mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 51109-C3 ✦	29,600	28,000
SKF	SKF 51109-C3	29,600	28,000
NTN	NTN 51109-C3	29,600	28,000
NACHI	NACHI 51109-C3	29,600	28,000
KOYO	KOYO 51109-C3	29,600	28,000
FAG	FAG 51109-C3	29,600	28,000
Timken	Timken 51109-C3	29,600	28,000
NTN	NTN 51109-C3	29,600	28,000
SKF	SKF 51109-C3	29,600	28,000

Available Variants

The NSK 51109 base bearing is available in these configurations:

NSK 51109-NR

Open with snap ring

NSK 51109-ZZ-C3

Double shielded, C3 clearance

NSK 51109-2RS-C3

Double sealed, C3 clearance

NSK 51109-2Z

Double metal shielded (ISO)

NSK 51109-ZZ

Double metal shielded

NSK 51109-2RS

Double rubber sealed

NSK 51109

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 51109-C3?

The NSK 51109-C3 has a bore diameter of 45mm, outside diameter of 65mm, and width of 14mm. It weighs 0.130kg.

What is the load capacity of the NSK 51109-C3?

The dynamic load rating (Cr) is 29,600 N and the static load rating (C₀r) is 28,000 N. The maximum recommended speed is 4,300 rpm with grease lubrication or 5,600 rpm with oil lubrication.

What bearings are equivalent to NSK 51109-C3?

The 51109-C3 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 45×65×14mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.