KOYO 6301-2Z Bearing — Specifications, Dimensions & Cross-Reference

The KOYO 6301-2Z is a deep groove ball bearing double metal shielded manufactured by KOYO. It belongs to the 6300 series and features dimensions of 12 × 37 × 12 mm (bore × OD × width). This bearing has a dynamic load rating of 9,750 N and a static load rating of 4,150 N, making it suitable for light-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	12 mm
Outside Diameter (D)	37 mm
Width (B)	12 mm
Weight	0.058 kg

Performance
Dynamic Load Rating (Cr)	9,750 N
Static Load Rating (C₀r)	4,150 N
Limiting Speed (Grease)	19,000 rpm
Limiting Speed (Oil)	24,000 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 — 6301-2Z Equivalents

The following bearings from other manufacturers are interchangeable with the KOYO 6301-2Z. All share identical dimensions (12×37×12mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
KOYO	KOYO 6301-2Z ✦	9,750	4,150
Timken	Timken 6301-2Z	9,750	4,150
SKF	SKF 6301-2Z	9,750	4,150
NTN	NTN 6301-2Z	9,750	4,150
NACHI	NACHI 6301-2Z	9,750	4,150
FAG	FAG 6301-2Z	9,750	4,150
Timken	Timken 6301-2Z	9,750	4,150
NSK	NSK 6301-2Z	9,750	4,150
NTN	NTN 6301-2Z	9,750	4,150
SKF	SKF 6301-2Z	9,750	4,150

Available Variants

The KOYO 6301 base bearing is available in these configurations:

KOYO 6301-ZZ-C3

"Double shielded

KOYO 6301-ZZ

Double metal shielded

KOYO 6301-NR

Open with snap ring

KOYO 6301-C3

"Open

KOYO 6301-2RS-C3

"Double sealed

KOYO 6301-2RS

Double rubber sealed

KOYO 6301

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the KOYO 6301-2Z?

The KOYO 6301-2Z has a bore diameter of 12mm, outside diameter of 37mm, and width of 12mm. It weighs 0.058kg.

What is the load capacity of the KOYO 6301-2Z?

The dynamic load rating (Cr) is 9,750 N and the static load rating (C₀r) is 4,150 N. The maximum recommended speed is 19,000 rpm with grease lubrication or 24,000 rpm with oil lubrication.

What bearings are equivalent to KOYO 6301-2Z?

The 6301-2Z is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 12×37×12mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.