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Sealed Double-Row Full Complement Cylindrical Roller Bearing NNF Type

NNF / SKF (Official website)

Sealed double-row full complement cylindrical roller bearing with bore diameter of 20 to 240 mm. Seals on both sides allow use in pre-lubricated condition.

Last verified: (date the content was verified against the source document)

Specifications

Inner diameter d 20〜240 mm
Outer diameter D 42〜360 mm
Width B 30 to 160 mm
Basic dynamic load rating Cr 45.7〜1680 kN
Basic static load rating C0r 55〜3350 kN
Limiting speed (grease lubrication) 340〜3400 r/min
Mass 0.2〜57.5 kg

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Sealed Double-Row Full Complement Cylindrical Roller Bearing NNF Type).

  1. 1. Bore and housing bore dimensions

    This product: Inner diameter d 20〜240 mm

    Select the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.

  2. 2. Dynamic load rating based on life calculation

    This product: Basic dynamic load rating Cr 45.7〜1680 kN

    The basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.

  3. 3. Margin for static and shock loads

    This product: Basic static load rating C0r 55〜3350 kN

    The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.

  4. 4. Operating speed and lubrication method

    This product: Limiting speed (grease lubrication) 340〜3400 r/min

    The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.

  5. 5. Precision grade and internal clearance

    Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.

  6. 6. Materials and lubrication suited to the environment

    For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.

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

About Rolling Bearings and all products

Description

The NNF type is a double-row full complement roller bearing with seals on both sides, available in model designations such as NNF 5004 ADB-2LSV. Retaining rings must be ordered separately.

Features

  • Lubricant sealed in by seals on both sides
  • Retaining ring groove provided for axial positioning
  • Retaining rings ordered separately

Applications

  • Machine tools
  • Industrial machinery
  • Speed reducers

FAQ

Q. What are the model numbers and dimension ranges of the NNF type sealed double-row full complement cylindrical roller bearing?
A. The NNF type ranges from 20 to 240 mm in bore diameter, 42 to 360 mm in outer diameter, and 30 to 160 mm in width, with model designations such as NNF 5004 ADB-2LSV.
Q. Can the NNF type bearing be used pre-lubricated, and what is the seal structure?
A. It has seals on both sides and can be used in pre-lubricated condition. The seals on both sides retain the lubricant inside the bearing.
Q. Is a retaining ring required for axial positioning of the NNF type?
A. The bearing has a retaining ring groove that enables axial positioning. Retaining rings must be ordered separately.
Q. What are the basic dynamic load rating, basic static load rating, and limiting speed of the NNF type?
A. The basic dynamic load rating Cr is 45.7 to 1680 kN, the basic static load rating C0r is 55 to 3350 kN, and the limiting speed (grease lubrication) is 340 to 3400 r/min.
Q. What is the mass of the NNF type and what are its main applications?
A. The mass is 0.2 to 57.5 kg. Main applications are machine tools, industrial machinery, and speed reducers.

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

Source documents

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