HK0709 bearing: complete specifications & equivalents
The HK0709 is a ISO 3245 radial bearing sized 7 x 11 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 | 7 mm |
| Outer diameter D | 11 mm |
| Width B | 9 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 3.03 kN |
| Basic static load rating C0 | 3.05 kN |
| Fatigue load limit Pu | 0.325 kN |
| Reference speed (thermal) | 20000 rpm |
| Limiting speed (mechanical) | 22000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2.6 g |
| Manufacturer designation | HK 0709 |
| 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 | 0.276 in |
|---|---|
| Outer diameter D | 0.433 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) | 5 of 26 |
| Bore above smallest HK-series size | 4 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HK0709FM | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart on the same 7×11×9 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 HK0709 model number is decoded
HK 0709 is an open-end drawn cup needle roller bearing to ISO 3245: a hardened, thin-walled shell of 11 mm outside diameter carrying a caged needle roller set for a 7 mm shaft, listed by SKF in SKF catalogue PUB BU/P1 17000. In HK 0709, Fw = 7 mm names the shaft that becomes the inner raceway and B = 9 mm the cup width; the shell outside diameter 11 mm is fixed by the boundary plan, so the housing bore needs only a press-fit tolerance. Open caged execution: the standard HK drawn cup with steel cage, relubricable through the shaft where the housing allows. The shell itself is the outer ring: hardened sheet steel, closed at neither end (open type), so the shaft can pass through and lubricant can be fed axially along the journal. Catalogue mass 2.6 g at 7×11×9 mm makes this one of the highest capacity-per-gram choices in the drawn cup needle roller bearings, open end; the limit is usually the shaft's ability to serve as a raceway, not the rolling contact itself. 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
- office equipment and power tool gear trains
- steering column and pedal-box pivots in passenger cars
- idler gears and pulleys in small appliance drives
- spindle clusters of drilling and tapping units
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after overload events
- fretting corrosion of the cup outside diameter in a soft or oversized housing bore
- grease starvation at the roller ends when relubrication intervals are stretched in dirty duty
- corrosion pitting from condensation in intermittently operated machinery
Selection pitfalls — read before you substitute
- At Fw 7 mm the rolling elements are under two millimetres long — handle the HK 0709 like a watch part: one dropped assembly, one over-pressed cup or one coarse journal finish outweighs any catalogue rating difference.
- Do not interchange envelope-identical needle families blindly: HK 0709 shares its 7×11×9 mm outline with inner-ring and sealed siblings whose ratings differ — the family letters are part of the specification, not decoration.
- 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.
- The 3.03/3.05 kN ratings and 2.6 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
How should the HK 0709 be mounted?
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.
What limits the service life of a HK 0709?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 7 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 0709?
A HK 0709 measures 7 mm bore/Fw × 11 mm outside diameter × 9 mm width (0.276 × 0.433 × 0.354 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 3.03 kN, static C0 3.05 kN, fatigue limit Pu 0.325 kN, limiting speed 22,000 r/min, reference speed 20,000 r/min, mass about 2.6 g.
How is the HK 0709 designation read?
HK = open-end drawn cup needle roller bearing (ISO 3245); the first two digits give Fw 7 mm, the last two the width 9 mm, the shell OD 11 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.