KOYO 7309-2RS Bearing — Specifications, Dimensions & Cross-Reference

The KOYO 7309-2RS is a angular contact ball bearing double rubber sealed manufactured by KOYO. 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
Weight0.781 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 -2RS suffix indicates double rubber contact seals, providing excellent protection against dust, moisture, and contaminants — ideal for harsh operating environments.

Brand Cross-Reference — 7309-2RS Equivalents

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

BrandPart NumberDynamic Load (N)Static Load (N)
KOYOKOYO 7309-2RS ✦55,30034,000
SKF SKF 7309-2RS 55,300 34,000
NTN NTN 7309-2RS 55,300 34,000
FAG FAG 7309-2RS 55,300 34,000
NACHI NACHI 7309-2RS 55,300 34,000
Timken Timken 7309-2RS 55,300 34,000
NSK NSK 7309-2RS 55,300 34,000
NTN NTN 7309-2RS 55,300 34,000
SKF SKF 7309-2RS 55,300 34,000

Available Variants

The KOYO 7309 base bearing is available in these configurations:

KOYO 7309-ZZ-C3
"Double shielded
KOYO 7309-ZZ
Double metal shielded
KOYO 7309-NR
Open with snap ring
KOYO 7309-C3
"Open
KOYO 7309-2Z
Double metal shielded (ISO)
KOYO 7309-2RS-C3
"Double sealed
KOYO 7309
Open (no seal/shield)

Frequently Asked Questions

What are the dimensions of the KOYO 7309-2RS?

The KOYO 7309-2RS 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 KOYO 7309-2RS?

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 KOYO 7309-2RS?

The 7309-2RS 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.