NACHI 7309-2Z Bearing — Specifications, Dimensions & Cross-Reference

The NACHI 7309-2Z is a angular contact ball bearing double metal shielded manufactured by NACHI. It belongs to the 7300 series and features dimensions of 45 × 100 × 25 mm (bore × OD × width). This bearing has a dynamic load rating of 55,300 N and a static load rating of 34,000 N, making it suitable for heavy-duty applications.

Technical Specifications

Dimensions
Bore Diameter (d)	45 mm
Outside Diameter (D)	100 mm
Width (B)	25 mm
Weight	0.781 kg

Performance
Dynamic Load Rating (Cr)	55,300 N
Static Load Rating (C₀r)	34,000 N
Limiting Speed (Grease)	6,300 rpm
Limiting Speed (Oil)	7,500 rpm

💡 Application Note: The 7300 series bearings are commonly used in heavy-duty machine tool spindles, large pumps, and high-speed turbines. 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 — 7309-2Z Equivalents

The following bearings from other manufacturers are interchangeable with the NACHI 7309-2Z. All share identical dimensions (45×100×25mm) and comparable load ratings:

Brand	Part Number	Dynamic Load (N)	Static Load (N)
NACHI	NACHI 7309-2Z ✦	55,300	34,000
SKF	SKF 7309-2Z	55,300	34,000
NTN	NTN 7309-2Z	55,300	34,000
KOYO	KOYO 7309-2Z	55,300	34,000
FAG	FAG 7309-2Z	55,300	34,000
Timken	Timken 7309-2Z	55,300	34,000
NSK	NSK 7309-2Z	55,300	34,000
NTN	NTN 7309-2Z	55,300	34,000
SKF	SKF 7309-2Z	55,300	34,000

Available Variants

The NACHI 7309 base bearing is available in these configurations:

NACHI 7309-NR

Open with snap ring

NACHI 7309-ZZ-C3

Double shielded, C3 clearance

NACHI 7309-2RS-C3

Double sealed, C3 clearance

NACHI 7309-C3

Open, C3 clearance

NACHI 7309-ZZ

Double metal shielded

NACHI 7309-2RS

Double rubber sealed

NACHI 7309

Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the NACHI 7309-2Z?

The NACHI 7309-2Z has a bore diameter of 45mm, outside diameter of 100mm, and width of 25mm. It weighs 0.781kg.

What is the load capacity of the NACHI 7309-2Z?

The dynamic load rating (Cr) is 55,300 N and the static load rating (C₀r) is 34,000 N. The maximum recommended speed is 6,300 rpm with grease lubrication or 7,500 rpm with oil lubrication.

What bearings are equivalent to NACHI 7309-2Z?

The 7309-2Z is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 45×100×25mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.