NTN UCP308J UC308

NTN UCP308J Pillow Block Bearing Unit

Description

The NTN UCP308J is a high-performance pillow block bearing unit, designed for reliability and long service life in various industrial environments. It consists of a solid cast iron housing and a UC308 deep groove ball bearing insert. This unit is easy to mount and features a grease nipple for convenient relubrication, extending its operational life.

Specifications

• Manufacturer: NTN
• Unit Type: UCP308J
• Housing Material: Cast Iron
• Bearing Insert: UC308
• Bore Diameter (Shaft Size): 40 mm
• Locking Type: Set Screw Locking
• Lubrication: Relubricatable via grease nipple

Label Info

• Brand: NTN
• Bearing Insert Model: UC308
• Housing Model: P308J (based on compatibility, marked P306J)

Application

Ideal for use in conveyor systems, agricultural machinery, construction equipment, and general industrial machinery where a rotating shaft needs support.

Country of Origin

Made in Japan.

CO2 Impact

Opting for this pre-owned bearing unit prevents the emission of approximately 5.8 kg of CO2 compared to manufacturing a new one.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the correct tightening torque for the set screws on the UC308 bearing insert?

For the M10x1 set screws on a UC308 bearing, the recommended tightening torque is approximately 29 N-m (Newton-meters). Proper torque is crucial to prevent shaft slippage without damaging the shaft or bearing.

Is this UCP308J unit suitable for high-speed applications?

The UCP series pillow blocks are generally designed for low to moderate speed applications. The limiting speed for the UC308 insert is typically around 3400 RPM with grease lubrication. For higher speeds, different bearing types or lubrication methods might be necessary.

What type of grease should be used for relubrication via the grease nipple?

A high-quality, lithium-based grease with an NLGI grade 2 consistency is generally recommended for NTN ball bearing units. Ensure the new grease is compatible with the factory-filled grease to prevent degradation of lubricating properties.

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Last Update: Friday, March 13, 2026