UK 313 NTN 65x140x49 Adapter Insert Ball Bearing

What Is the UK 313 NTN Bearing?

The UK 313 NTN is an adapter insert ball bearing with a tapered bore (1:12) designed for mounting on an adapter sleeve. It is widely used in plummer block housings, take-up units and flange units, where self-alignment and easy installation are required. With dimensions of 65x140x49 mm (bearing width B) and an outer ring width of 39 mm (C), the UK 313 provides reliable operation under high radial loads while accommodating moderate misalignment.

Bearing Design

The UK 313 NTN features:

• Adapter-type insert bearing
• Self-aligning ball bearing design
• Tapered bore 1:12
• Double contact seals
• Nitrile rubber sealing lips
• Through-hardened bearing steel
• Adapter sleeve mounting system

The tapered bore allows secure mounting on a cylindrical shaft using the appropriate adapter sleeve, simplifying installation and replacement.

Technical Specification

Manufacturer: NTN

Part Number: UK 313

Bearing Type: Adapter Insert Ball Bearing

Bearing Design: Self-aligning

Bore Type: Tapered (1:12)

Inside Diameter (d): 65 mm

Outside Diameter (D): 140 mm

Inner Ring Width (B): 49 mm

Outer Ring Width (C): 39 mm

Seal Type: Double Contact Seal

Seal Material: Nitrile Rubber (NBR)

Locking Method: Adapter Sleeve

Material: Through Hardened Bearing Steel

Lubrication: Factory Greased

Operating Temperature: -40°C to +120°C

Dynamic Load Rating (C): 92.5 kN

Static Load Rating (C0): 60 kN

Weight: Approximately 3.08 kg

How Does an Adapter Insert Bearing Work?

An adapter insert bearing is mounted onto a cylindrical shaft using an adapter sleeve and locknut.

Its design provides:

• Easy installation and removal
• Self-alignment capability
• Reliable shaft positioning
• High radial load capacity
• Smooth running performance
• Reduced maintenance time

This mounting system is particularly useful where shafts do not have machined bearing seats.

Typical Applications

The UK 313 NTN is commonly used in:

• Plummer block housings
• Pillow block bearing units
• Take-up units
• Flange bearing units
• Agricultural machinery
• Conveyor systems
• Material handling equipment
• Fans and blowers
• Industrial machinery
• Processing equipment
• OEM machinery
• Industrial maintenance (MRO)

Advantages of NTN Bearings

NTN bearings are designed for demanding industrial environments.

Key benefits include:

• High dimensional accuracy
• Reliable sealing against contaminants
• Self-aligning design
• High radial load capacity
• Durable bearing steel
• Easy installation with adapter sleeves
• Long service life in industrial applications

Installation Recommendations

Before installation, verify:

• Shaft diameter
• Correct adapter sleeve
• Housing dimensions
• Locknut and lock washer
• Shaft tolerance
• Lubrication condition
• Proper bearing alignment

Correct installation ensures maximum bearing performance and service life.

Frequently Asked Questions (FAQ)

What are the dimensions of the UK 313 NTN bearing?

The bearing has a 65 mm bore, 140 mm outside diameter, 49 mm inner ring width (B) and 39 mm outer ring width (C).

What type of bearing is UK 313 NTN?

It is a self-aligning adapter insert ball bearing with a 1:12 tapered bore.

Does the bearing require an adapter sleeve?

Yes. The UK 313 is designed to be mounted on a cylindrical shaft using an appropriate adapter sleeve.

Is the bearing sealed?

Yes. It is equipped with double contact seals made from nitrile rubber to protect against contamination and retain lubricant.

Where is the UK 313 NTN commonly used?

It is widely used in plummer blocks, flange units, conveyor systems, agricultural machinery and industrial equipment.

What are the main advantages of the UK 313 design?

The bearing offers self-alignment, easy installation, reliable sealing, high load capacity and simplified maintenance.