HK2820-2RS bearing: complete specifications & equivalents
The HK2820-2RS is a ISO 3245 radial bearing sized 28 x 35 x 20 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 28 mm |
| Outer diameter D | 35 mm |
| Width B | 20 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 15.7 kN |
| Basic static load rating C0 | 26.5 kN |
| Fatigue load limit Pu | 3.15 kN |
| Limiting speed (mechanical) | 6300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 34 g |
| Manufacturer designation | HK 2820.2RS |
| 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 | 1.102 in |
|---|---|
| Outer diameter D | 1.378 in |
| Width B | 0.787 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 3.5 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) | 19 of 26 |
| Bore above smallest HK-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HK2820 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing on the same 28×35×20 mm envelope, but catalogue C/C0 differ (15.7/26.5 vs 21.3/36 kN) — envelope interchange only after a load check. |
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 HK2820-2RS model number is decoded
HK 2820.2RS is an open-end drawn cup needle roller bearing to ISO 3245: a hardened, thin-walled shell of 35 mm outside diameter carrying a caged needle roller set for a 28 mm shaft, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the code: HK marks the open-end drawn cup series, the first two digits (28) give the 28 mm under-roller diameter Fw, the last two (20) the 20 mm width; the 35 mm OD follows the ISO 3245 plan. Sealed 2RS execution: rubber contact seals on both cup faces, factory grease fill, and the slightly lower ratings of a sealed drawn cup — 15.7 kN C against the open bearing of the same code. Drawn cups exist open (basic HK), sealed (2RS, with contact seals and grease fill) and with polymer TN cage; each is a separate order number with its own ratings, not a field conversion. Selection arithmetic: C 15.7 kN against C0 26.5 kN gives a C0/C ratio of 1.69, and the 3.15 kN fatigue load limit Pu sets the floor for the adjusted-life calculation at contaminated lubrication. Open ends mean the housing must do the sealing; where that is impossible, the 2RS execution with its integrated seals and grease fill replaces sealing rings that would not fit the 20 mm section.
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
- hard-particle indentation in unfiltered lubricant
Selection pitfalls — read before you substitute
- At 28 mm bore, verify shaft deflection against the needle length: these rollers tolerate little edge loading, and a simply supported span between 28 mm seats can bend past the compensation range long before the load rating is exhausted.
- The quoted 15.7/26.5 kN ratings are SKF catalogue values for this exact execution (HK 2820.2RS); ratings can be revised without the order number changing, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the drawing.
- Oscillating pivots fail differently: rocking through a small angle concentrates wear in the same roller positions — inspect those zones, and consider rotating the assembly's clock position at service intervals.
- The 15.7/26.5 kN ratings and 34 g mass are SKF catalogue values transcribed from ch. 7.2 of PUB BU/P1 17000 (PDF table page 622); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
Does the HK 2820.2RS need a hardened and ground shaft?
No. In this execution the 28 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.
What mounting mistakes ruin a HK 2820.2RS?
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 2820.2RS sealed?
Yes — this is the 2RS execution with rubber contact seals on both cup faces and a factory grease fill, sealed for life at the 28 mm seat. The open HK execution of the same code relies on the housing for sealing.
Which dimensions does the HK 2820.2RS have?
A HK 2820.2RS measures 28 mm bore/Fw × 35 mm outside diameter × 20 mm width (1.102 × 1.378 × 0.787 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 15.7 kN, static C0 26.5 kN, fatigue limit Pu 3.15 kN, limiting speed 6,300 r/min, mass about 34 g.
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.