UC2 Series Triple Seal Bearing (for Set Screw Type Ball Bearing Units)

Specifications

How to choose Insert Bearings

Points to check when selecting, with the values for this product (UC2 Series Triple Seal Bearing (for Set Screw Type Ball Bearing Units)).

1. 1. Select the bore to suit the shaft diameter

   This product: Inner diameter d 12~90 mm

   The bore d is the shaft diameter to be applied, and listed products range from 12 to 90 mm. Set screw and eccentric collar types secure the bearing through clearance with the shaft, so the shaft tolerance should also be checked. For standard-dimension products such as JIS UC-type, compatibility with existing units should be checked to make replacement easier.

2. 2. Estimate life using the basic dynamic load rating

   This product: Basic dynamic load rating Cr 12800~96000 N

   The basic dynamic load rating Cr is the reference for rolling fatigue life calculation, and listed products range from 12800 to 96000 N. Calculate the rated life from the actual load and rotational speed, and confirm whether it meets the required operating time. If shock or vibration is present, apply a load factor.

3. 3. Check the static load rating for stationary or low-speed operation

   This product: Basic static load rating Cor 6650~71500 N

   The basic static load rating Cor is the reference for the permissible load during standstill or extremely low-speed operation, and listed products range from 6650 to 71500 N. In applications where large loads or shocks are applied while stopped, confirm that an adequate static safety factor is secured to avoid noise and vibration caused by indentation.

4. 4. Do not exceed the maximum rotational speed

   The limiting speed and the permissible dn value (bore multiplied by rotational speed) define the upper limit of usable speed. Contact-type multi-seal products tend to generate heat from seal friction and therefore tend to have lower limits. Confirm that the actual maximum rotational speed has sufficient margin.

5. 5. Select lubrication and specifications suited to temperature

   Standard grease-packed products should be used within the specified operating temperature range. High-temperature types with maximum operating temperatures of 250 to 350 °C are available, and some graphite-lubricated types require no regreasing. Also check in advance whether food-grade compatibility is available and whether the type requires a break-in run.

6. 6. Consider fixing method and seals for dust and moisture

   In environments with heavy dust or muddy water, such as steelmaking, waste treatment, and water and sewage systems, triple-lip seal types are effective for retaining grease and preventing foreign matter ingress. The mounting method differs depending on whether the shaft is secured with set screws or eccentric locking collars, so select the fixing method together with measures against loosening caused by vibration.

This guide was written by AI based on the listed products' documents and specification items.

About Insert Bearings and all products

Description

A bearing with a dedicated three-lip seal that enhances dust and waterproof performance. Compared with the conventional rubber seal plus flinger type, it offers longer dust-resistance life and higher resistance to muddy water. The set screw design, with balls embedded in the inner ring, resists loosening caused by vibration and impact. Conforms to the JIS UC type and is interchangeable with existing NSK and other manufacturers' units, so it can be used as a replacement. Bore diameter: 12 to 90 mm. Operating temperature: -15 to 100 °C. Allowable dn value: 36,000.

FAQ

Q. In what environments can the UC2 Series Triple Seal Bearing (UC2...LLJ) be used?

A. It is a bearing with a dedicated three-lip seal that enhances dust and waterproof performance. Compared with the conventional rubber seal plus flinger type, it offers longer dust-resistance life and higher resistance to muddy water. The operating temperature range is -15 to 100 °C.

Q. What are the mounting method and interchangeability of the UC2 Series Triple Seal Bearing (UC2...LLJ)?

A. It uses a set screw with balls embedded in the inner ring, which resists loosening caused by vibration and impact. It conforms to the JIS UC type and is interchangeable with existing NSK and other manufacturers' units, so it can also be used as a replacement.

Q. Can the UC2 Series Triple Seal Bearing (UC2...LLJ) replace conventional units with covers?

A. In applications where a cover is not required, it can replace conventional units with covers.

Q. What are the ranges of bore diameter, load ratings, and mass for the UC2 Series Triple Seal Bearing (UC2...LLJ)?

A. The bore diameter d is 12 to 90 mm. The basic dynamic load rating Cr is 12800 to 96000 N, the basic static load rating Cor is 6650 to 71500 N, and the mass is 0.17 to 9.88 kg.

Q. What are the allowable dn value and standard lubricant for the UC2 Series Triple Seal Bearing (UC2...LLJ)?

A. The allowable dn value is 36000. The standard lubricant is lithium-based mineral oil grease.

Written by AI based on the content of the source documents.

Source documents

• Catalog Triple-Sealed Bearings for Ball Bearing Units 5 pages
  Found on: https://www.nsk.com/products/bearing-units/