Catalog Searcher
Categories

Shell Type Needle Roller Bearings (HK, BK, HN Series)

HK / BK / HN / SKF (Official website)

Small, low-section needle roller bearings with a deep-drawn thin-walled outer ring. Mounted in the housing with an interference fit.

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

How to choose Needle roller bearings

Points to check when selecting, with the values for this product (Shell Type Needle Roller Bearings (HK, BK, HN Series)).

  1. 1. Select dimensions by shaft diameter and presence of inner ring

    Types without an inner ring use the shaft directly as the raceway, so the roller pitch circle diameter Fw corresponds to the applicable shaft diameter. In this case the shaft requires sufficient hardness and surface finish. If the shaft cannot serve as the raceway, select a type with an inner ring and match the shaft diameter using the bore diameter d.

  2. 2. Check housing dimensions by outside diameter and width

    The outside diameter D determines the housing bore diameter, and the width C determines the axial installation space. Shell types have thin walls and allow a smaller outside diameter, but they are retained by press fit, so the housing bore tolerance and rigidity must be verified.

  3. 3. Verify life and static strength with rated loads

    The basic dynamic load rating Cr is used for calculating rolling fatigue life, and the basic static load rating C0r is used for examining permanent deformation under shock loads or stationary loads. The listed Cr values range widely from 1.23 to 13200 kN, and are larger for double-row types and larger diameters.

  4. 4. Choose the type suited to the application

    Select shell types for space savings and solid types for high load and high rigidity. Select self-aligning types where shaft tilt is present, combined types with thrust bearings for fixed-side positions that also carry axial load, and cam followers for applications rolling along cams or rails.

  5. 5. Match rotational speed with lubrication method

    The limiting speed varies with the lubrication method, and generally oil lubrication allows higher speeds than grease lubrication. Confirm that the operating speed is below the limiting speed for each lubrication condition.

  6. 6. Consider sealing and operating environment

    In environments where foreign matter or moisture may enter, selecting contact-seal types such as RS or 2RS, or grease-packed types, helps retain lubricant and reduces relubrication effort. However, the seal increases rotational resistance and imposes limits on operating temperature, so these points should be considered.

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

About Needle roller bearings and all products

Description

HK is open on both ends, BK is closed on one end (for shaft end use), and HN is full complement, suitable for heavy radial loads at moderate rotational speeds. HK and BK are also available with seals. Full complement types are factory-filled with special grease, and re-greasing after installation is recommended.

Features

  • Very low cross-sectional height
  • High load capacity
  • No shoulders or retaining rings required
  • HK and BK available with seals

Applications

  • Compact and economical bearing arrangements
  • Shaft end support

FAQ

Q. What are the differences between the HK, BK, and HN series of SKF shell type needle roller bearings?
A. HK is open on both ends, BK is closed on one end (for shaft end use), and HN is full complement. HN is suitable for heavy radial loads at moderate rotational speeds.
Q. Are seals available for the HK and BK series shell type needle roller bearings?
A. HK and BK can be selected with seals.
Q. Do full complement needle roller bearings of the HN series require greasing after installation?
A. Full complement types are factory-filled with special grease. Re-greasing after installation is recommended.
Q. How are HK, BK, and HN series needle roller bearings mounted in the housing, and are shoulders or retaining rings required?
A. They are mounted in the housing with an interference fit. Shoulders and retaining rings are not required.
Q. What are the features of HK, BK, and HN series needle roller bearings in terms of cross-sectional height and load capacity?
A. They have a very low cross-sectional height and high load capacity. The design is compact and low-section, with a deep-drawn thin-walled outer ring.

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

Source documents

Similar products (other manufacturers)

Needle roller bearings products, ordered by similarity of specifications and applications.

More products from SKF

See all →