HK0609 bearing: complete specifications & equivalents
The HK0609 is a ISO 3245 radial bearing sized 6 x 10 x 9 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 | 9 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 2.81 kN |
| Basic static load rating C0 | 2.7 kN |
| Fatigue load limit Pu | 0.285 kN |
| Reference speed (thermal) | 20000 rpm |
| Limiting speed (mechanical) | 22000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2.5 g |
| Manufacturer designation | HK 0609 |
| 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 | 0.354 in |
| ISO bore code | 09 |
| 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
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HK0609FM | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart on the same 6×10×9 mm envelope with ratings within 10 % — interchange after checking the execution (cage/seal) details on both pages. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the HK0609 model number is decoded
SKF supplies HK 0609 for housings where machining an outer-ring pocket is uneconomical: the 10 mm shell broached from sheet steel press-fits into a plain bore and runs a 6 mm hardened shaft. Reading the code: HK marks the open-end drawn cup series, the first two digits (06) give the 6 mm under-roller diameter Fw, the last two (09) the 9 mm width; the 10 mm OD follows the ISO 3245 plan. 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 2.81 kN against C0 2.7 kN gives a C0/C ratio of 0.96, and the 0.285 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
- needle edge loading and raceway denting when the shaft deflects beyond the compensation range
- fretting corrosion of the cup outside diameter in a soft or oversized housing bore
- abrasive paste formation from dust ingressing past open ends without effective housing seals
- corrosion pitting from condensation in intermittently operated machinery
Selection pitfalls — read before you substitute
- At Fw 6 mm the rolling elements are under two millimetres long — handle the HK 0609 like a watch part: one dropped assembly, one over-pressed cup or one coarse journal finish outweighs any catalogue rating difference.
- Reference and limiting speeds are different limits: the 20,000 r/min reference is the thermal criterion under load, The limiting value is mechanical; the reference value is thermal under load, and grease choice moves it substantially.
- 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 2.81/2.7 kN ratings and 2.5 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 mounting mistakes ruin a HK 0609?
Press the cup in with a shouldered mandrel bearing on the stamped face, into a housing bore sized for a firm press fit; never hammer it or press through the rollers. Then slide the hardened shaft in. For 2RS executions the seals and grease are already in place — no additional sealing is needed.
Is the HK 0609 sealed?
No — the open-end HK cup has no seals: the housing must keep contamination out and grease in. The 2RS execution of the same code adds both-side contact seals with a grease fill.
Which dimensions does the HK 0609 have?
A HK 0609 measures 6 mm bore/Fw × 10 mm outside diameter × 9 mm width (0.236 × 0.394 × 0.354 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 2.81 kN, static C0 2.7 kN, fatigue limit Pu 0.285 kN, limiting speed 22,000 r/min, reference speed 20,000 r/min, mass about 2.5 g.
What does HK 0609 mean in SKF part numbering?
HK = open-end drawn cup needle roller bearing (ISO 3245); the first two digits give Fw 6 mm, the last two the width 9 mm, the shell OD 10 mm follows the plan. 2RS adds both-side contact seals, TN the polymer cage.
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.