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Double-Row Full Complement Cylindrical Roller Bearing NNCF Type

NNCF / SKF (Official website)

Double-row full complement cylindrical roller bearing with bore diameter of 20 to 400 mm. Outer ring has no flange and does not support axial load. Available in NNCF, NNC, and NNCL types.

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

Specifications

Inner diameter d 20〜400 mm
Outer diameter D 42〜600 mm
Width B 25〜272 mm
Basic dynamic load rating Cr 52.3〜5500 kN
Basic static load rating C0r 57〜11000 kN
Limiting speed (grease lubrication) 500〜10000 r/min
Mass 0.2〜270 kg

How to choose Rolling Bearings

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

  1. 1. Bore and housing bore dimensions

    This product: Inner diameter d 20〜400 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 52.3〜5500 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 57〜11000 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) 500〜10000 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

NNCF type is a double-row full complement bearing with flanges on both inner and outer rings, and can be handled with rollers assembled. Dimensions cover a range of d20 to 400 mm, and many size variations exist within the same series, so representative specification ranges are listed.

Features

  • High radial load capacity from double-row full complement design
  • Inner and outer rings can be separated
  • Boundary dimensions compatible with NNCL and NNC types

Applications

  • Machine tools
  • Industrial machinery
  • Speed reducers

FAQ

Q. What is the range of bore and outer diameters for NNCF type double-row full complement cylindrical roller bearings?
A. Bore diameter d is 20 to 400 mm, outer diameter D is 42 to 600 mm, and width B is 25 to 272 mm.
Q. Can NNCF type bearings support axial load?
A. NNCF type has flanges on both inner and outer rings, but does not support axial load. The outer ring is not a flangeless type.
Q. Can the inner and outer rings of NNCF type be handled separately?
A. Yes, the inner and outer rings can be separated. They can be handled with rollers assembled.
Q. What are the ranges of basic dynamic load rating and basic static load rating for NNCF type?
A. Basic dynamic load rating Cr is 52.3 to 5500 kN, and basic static load rating C0r is 57 to 11000 kN.
Q. What are the ranges of limiting speed and mass for NNCF type?
A. Limiting speed (grease lubrication) is 500 to 10000 r/min, and mass is 0.2 to 270 kg.

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

Source documents

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