NTN 4T-3877 Tapered Roller Bearing

Basic Number & Configuration

• Basic Number: 3877
• Type: Single‑row tapered roller bearing cone
• Cage: Pressed steel cage
• Precision Class: Standard precision

Dimensions (inches)

• Bore (d): 1.625 in (41.275 mm)
• Width (B): 1.1875 in (30.175 mm)
• Outer Diameter (D): Not listed in some sources; for 4T‑3877/3820 assembly, outer diameter is 3.375 in (85.73 mm)
• Flange OD: Not applicable (no flange)

Weight

• Approx. Weight: 0.52 kg (some listings show 0.82 kg for 4T‑3877/3820 assembly)

Material & Construction

• Case: Carburized steel case
• Seals: 2RS (double‑row sealed) in some configurations

Assembly Notes

• Often paired with a matching tapered roller bearing (e.g., 4T‑3877/3820) to form a complete tapered roller bearing unit 
• Used in applications requiring high radial load capacity and angular load capability.

Key Features

• Standard precision for general industrial use.
• Suitable for heavy‑duty applications where radial and axial loads are combined.