NTN 7304B

Single-Row Angular Contact Ball Bearing – 40° Contact Angle

Brand: NTN
Country of Origin: Japan
Item Number: 7304B NTN
EAN: 4547359448412
Category: Angular Contact Ball Bearing – Single Row

1. Dimensions

Metric

• Inner Diameter (d): 20 mm
• Outer Diameter (D): 52 mm
• Width (B): 15 mm

Inch

• Inner Diameter: 0.7874 in
• Outer Diameter: 2.0472 in
• Width: 0.5906 in

Approx. Weight: ~0.14–0.15 kg

2. Product Properties

• Bearing Type: Single-row angular contact ball bearing
• Contact Angle: 40° (B-type)
• Axial Internal Clearance / Preload: No preload (standard)
• Rows: 1
• Enclosure: Open (no seals / no shields)
• Cage Type: Pressed steel cage
• Material: Chrome steel (rings and balls)
• Lubrication: Standard lubrication

3. Technical Data (Typical)

• Radial Dynamic Load Rating (Cr): ~17–19 kN
• Radial Static Load Rating (C0r): ~9–10 kN
• Limiting Speed (Grease): ~13,000 rpm
• Limiting Speed (Oil): ~18,000 rpm
• Internal Clearance: Standard (CN)
• Precision Level: Standard (ISO Class 0 / ABEC 1)

4. Technical Description

The NTN 7304B is a single-row angular contact ball bearing with a 40° contact angle, designed to support combined loads:

• Radial loads
• Axial loads in one direction

The 40° contact angle gives it higher axial load capacity and stiffness compared to a deep groove ball bearing of the same size.

It is an open bearing, with a pressed steel cage and no preload, ideal for general industrial applications where good speed capability and combined load support are required.
These bearings can be mounted:

• Individually, when axial load is mainly in one direction
• In matched pairs (DB, DF, DT) when axial load in both directions or extra rigidity is needed

5. Typical Applications

• Electric motors and pumps
• Gearboxes and reducers
• General industrial machinery
• Compressors and blowers
• Applications with combined radial + axial load in limited space

6. Key Advantages

• Premium Japanese NTN quality
• 40° contact angle → better axial load capacity
• Compact single-row design
• Open design → flexible lubrication strategy
• Standard dimensions (20×52×15 mm) → interchangeable with other 7304B brands

   PACKAGE INCLUDES: ONE (1) NTN Bearing 7304 B