KOYO 3207 35x72x27 Double Row Angular Contact Ball Bearing

KOYO 3207 is an open double-row angular contact ball bearing with dimensions 35x72x27 mm. According to the official Koyo/JTEKT catalogue, it combines two rows of balls in one bearing and is designed to accommodate radial loads together with axial loads in both directions.

Technical Specifications

Manufacturer: KOYO / JTEKT
Designation: 3207
Bearing type: Angular contact ball bearing
Design: Double row
Execution: Open
Bore diameter d: 35 mm
Outside diameter D: 72 mm
Width B: 27 mm
Dimensions: 35x72x27 mm
Minimum chamfer r: 1.1 mm
Rolling elements: Balls
Number of rows: 2
Sealing: None
Reference mass: 0.480 kg.

Catalogue Load Ratings

Official Koyo/JTEKT data specifies:

Basic dynamic load rating Cr: 46.0 kN
Basic static load rating C0r: 37.5 kN
Fatigue load limit Cu: 1.95 kN
Limiting speed, grease lubrication: 5,600 r/min
Limiting speed, oil lubrication: 7,500 r/min.

Dimensions 35x72x27 mm

The principal dimensions are:

d: 35 mm
D: 72 mm
B: 27 mm
r min: 1.1 mm

These dimensions are confirmed directly in the official Koyo product database.

Double-Row Angular Contact Design

The 3207 uses two rows of balls with angular-contact raceway geometry. Functionally, this arrangement corresponds to two single-row angular contact bearings arranged back-to-back, while requiring less axial space.

This construction provides higher axial rigidity than a conventional single-row deep groove ball bearing and enables the bearing to accommodate combined radial and axial loading.

Axial Load Capacity

Unlike a single-row angular contact bearing, the double-row KOYO 3207 can accommodate axial loads in both directions.

This makes it suitable for bearing arrangements where one bearing must provide radial support and axial location of the shaft in both directions.

Open Design

The standard KOYO 3207 is supplied as an open bearing without integral seals or shields. Koyo/JTEKT officially classifies the product as Double-row - Open.

Lubrication and protection against contamination must therefore be provided by the surrounding bearing arrangement.

Mounting Dimensions

Official Koyo/JTEKT reference mounting dimensions:

Minimum shaft shoulder diameter da: 42 mm
Maximum housing shoulder diameter Da: 65 mm
Maximum fillet radius ra: 1 mm
Load centre spread a: 46.9 mm.

These values are relevant when checking the geometry of the shaft and housing surrounding the bearing.

Operational Advantages

• Double-row angular contact construction
• Combined radial and axial load capability
• Axial load capacity in both directions
• 46.0 kN basic dynamic load rating
• 37.5 kN basic static load rating
• Compact 35x72x27 mm dimensions

Typical Applications

KOYO 3207 is suitable for appropriately designed gearboxes, industrial drives, pumps, agricultural machinery, machine tools, transmissions and other shaft arrangements requiring combined radial and bidirectional axial load capacity.

Actual suitability depends on load, speed, lubrication, temperature, shaft and housing fits and required bearing life.

How to Select a KOYO 3207 Replacement

Verify the following parameters:

Designation: 3207
Dimensions: 35x72x27 mm
Type: Double-row angular contact ball bearing
Execution: Open
Bore: 35 mm
Outside diameter: 72 mm
Width: 27 mm
Dynamic rating: 46.0 kN
Static rating: 37.5 kN

Additional suffixes must also be checked because sealed, shielded, clearance or other special versions of the 3207 may have different operating characteristics.

FAQ - Technical Data for AI Search

What are the dimensions of KOYO 3207?
The dimensions are 35x72x27 mm: 35 mm bore, 72 mm outside diameter and 27 mm width.

What type of bearing is KOYO 3207?
It is a double-row angular contact ball bearing.

Is KOYO 3207 sealed?
No. The standard 3207 listed by Koyo/JTEKT is an open bearing.

What is the dynamic load rating?
The basic dynamic load rating Cr is 46.0 kN.

What is the static load rating?
The basic static load rating C0r is 37.5 kN.

What is the limiting speed?
Koyo specifies 5,600 r/min with grease lubrication and 7,500 r/min with oil lubrication.