NSK 6310-2Z Bearing — Specifications, Dimensions & Cross-Reference

The NSK 6310-2Z is a deep groove ball bearing double metal shielded manufactured by NSK. It belongs to the 6300 series and features dimensions of 50 × 110 × 27 mm (bore × OD × width). This bearing has a dynamic load rating of 61,800 N and a static load rating of 38,000 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	50 mm
Outside Diameter (D)	110 mm
Width (B)	27 mm
Weight	1.056 kg

Performance
Dynamic Load Rating (Cr)	61,800 N
Static Load Rating (C₀r)	38,000 N
Limiting Speed (Grease)	6,300 rpm
Limiting Speed (Oil)	7,500 rpm

💡 Application Note: The 6300 series bearings are commonly used in heavy-duty electric motors, mining equipment, construction machinery, and industrial gearboxes. The -2Z suffix indicates double metal shields, offering good protection while maintaining lower friction than rubber seals — suitable for higher speed applications.

Brand Cross-Reference — 6310-2Z Equivalents

The following bearings from other manufacturers are interchangeable with the NSK 6310-2Z. All share identical dimensions (50×110×27mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NSK	NSK 6310-2Z ✦	61,800	38,000
Timken	Timken 6310-2Z	61,800	38,000
SKF	SKF 6310-2Z	61,800	38,000
NTN	NTN 6310-2Z	61,800	38,000
NACHI	NACHI 6310-2Z	61,800	38,000
KOYO	KOYO 6310-2Z	61,800	38,000
FAG	FAG 6310-2Z	61,800	38,000
Timken	Timken 6310-2Z	61,800	38,000
NTN	NTN 6310-2Z	61,800	38,000
SKF	SKF 6310-2Z	61,800	38,000

Available Variants

The NSK 6310 base bearing is available in these configurations:

NSK 6310-NR

Open with snap ring

NSK 6310-ZZ-C3

Double shielded, C3 clearance

NSK 6310-2RS-C3

Double sealed, C3 clearance

NSK 6310-C3

Open, C3 clearance

NSK 6310-ZZ

Double metal shielded

NSK 6310-2RS

Double rubber sealed

NSK 6310

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NSK 6310-2Z?

The NSK 6310-2Z has a bore diameter of 50mm, outside diameter of 110mm, and width of 27mm. It weighs 1.056kg.

What is the load capacity of the NSK 6310-2Z?

The dynamic load rating (Cr) is 61,800 N and the static load rating (C₀r) is 38,000 N. The maximum recommended speed is 6,300 rpm with grease lubrication or 7,500 rpm with oil lubrication.

What bearings are equivalent to NSK 6310-2Z?

The 6310-2Z is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 50×110×27mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.