HK0608 bearing: complete specifications & equivalents
The HK0608 is a ISO 3245 radial bearing sized 6 x 10 x 8 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 6 mm |
| Outer diameter D | 10 mm |
| Width B | 8 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 2.01 kN |
| Basic static load rating C0 | 1.73 kN |
| Fatigue load limit Pu | 0.18 kN |
| Reference speed (thermal) | 20000 rpm |
| Limiting speed (mechanical) | 22000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2.1 g |
| Manufacturer designation | HK 0608 |
| Standard | ISO 3245 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.2 drawn cup needle roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.2 drawn cup needle roller bearings) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.2 drawn cup needle roller bearings); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & HK-series range
| Bore d | 0.236 in |
|---|---|
| Outer diameter D | 0.394 in |
| Width B | 0.315 in |
| ISO bore code | 08 |
| Radial section height (D−d)/2 | 2 mm |
| Smallest bore in HK-series | 3 mm |
| Largest outer diameter in HK-series | 68 mm |
| Width range across HK-series | 6–38 mm |
| Bore position in HK-series (smallest first) | 4 of 26 |
| Bore above smallest HK-series size | 3 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the HK0608 model number is decoded
In SKF catalogue PUB BU/P1 17000, HK 0608 denotes a 6×10×8 mm drawn cup needle roller bearing with open ends — the shaft journal is the inner raceway, the pressed shell the outer, and the cage keeps the rollers parallel. SKF's HK numbering puts the shaft size first: 06 → Fw 6 mm (the ground, hardened journal), 08 → width 8 mm, with the 10 mm shell OD from the ISO 3245 dimension table. Open caged execution: the standard HK drawn cup with steel cage, relubricable through the shaft where the housing allows. Caged HK bearings space the rollers for lower friction than full complement HK types; the cage is not a seal — 2RS executions are the sealed members of the family. Selection arithmetic: C 2.01 kN against C0 1.73 kN gives a C0/C ratio of 0.86, and the 0.18 kN fatigue load limit Pu sets the floor for the adjusted-life calculation at contaminated lubrication. Mounting: press the cup in with a shouldered mandrel against the stamped end face only — through-the-rollers pressing brinells both raceways; the housing bore takes a firm press fit and the shaft slides in after.
Typical equipment & failure modes
Common applications
- steering column and pedal-box pivots in passenger cars
- idler gears and pulleys in small appliance drives
- spindle clusters of drilling and tapping units
- auto steering gear rack supports
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after overload events
- drawn-cup shell distortion or splitting from a careless press-in without a seating mandrel
- abrasive paste formation from dust ingressing past open ends without effective housing seals
- rolling-contact fatigue spalling after the rated L10 life
Selection pitfalls — read before you substitute
- At Fw 6 mm the rolling elements are under two millimetres long — handle the HK 0608 like a watch part: one dropped assembly, one over-pressed cup or one coarse journal finish outweighs any catalogue rating difference.
- Hardness is load capacity: in families without an inner ring the 6 mm journal must hold 58–64 HRC with a ground finish; a surface that looks fine but sits at 45 HRC will rib the raceway within weeks.
- The quoted 2.01/1.73 kN ratings are SKF catalogue values for this exact execution (HK 0608); ratings can be revised without the order number changing, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the drawing.
- The 2.01/1.73 kN ratings and 2.1 g mass are SKF catalogue values transcribed from ch. 7.2 of PUB BU/P1 17000 (PDF table page 620); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
What limits the service life of a HK 0608?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 6 mm seat, lubricant condition at the roller ends, and contamination through open ends — the 2.0 mm radial section leaves no reserve once a raceway is dented or ribboned.
What are the dimensions and ratings of the HK 0608?
A HK 0608 measures 6 mm bore/Fw × 10 mm outside diameter × 8 mm width (0.236 × 0.394 × 0.315 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 2.01 kN, static C0 1.73 kN, fatigue limit Pu 0.18 kN, limiting speed 22,000 r/min, reference speed 20,000 r/min, mass about 2.1 g.
How is the HK 0608 designation read?
HK = open-end drawn cup needle roller bearing (ISO 3245); the first two digits give Fw 6 mm, the last two the width 8 mm, the shell OD 10 mm follows the plan. 2RS adds both-side contact seals, TN the polymer cage.
Can the HK 0608 run on an unhardened shaft?
No. In this execution the 6 mm shaft journal is the inner raceway: it must be ground and hardened to 58–64 HRC (with matching housing bore quality on the outside). If the shaft cannot meet that, order the inner-ring sibling (NKI/NA execution) plus its ground inner ring instead.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.2 drawn cup needle roller bearings on 2026-09-26. Read our editorial & correction policy.