HK1816-2RS bearing: complete specifications & equivalents
The HK1816-2RS is a ISO 3245 radial bearing sized 18 x 24 x 16 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 | 18 mm |
| Outer diameter D | 24 mm |
| Width B | 16 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 7.92 kN |
| Basic static load rating C0 | 11.2 kN |
| Fatigue load limit Pu | 1.27 kN |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 15 g |
| Manufacturer designation | HK 1816.2RS |
| 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 | 0.709 in |
|---|---|
| Outer diameter D | 0.945 in |
| Width B | 0.63 in |
| ISO bore code | 16 |
| Radial section height (D−d)/2 | 3 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) | 15 of 26 |
| Bore above smallest HK-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| HK1816F | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing on the same 18×24×16 mm envelope, but catalogue C/C0 differ (7.92/11.2 vs 11.8/17.3 kN) — envelope interchange only after a load check. |
| HK1816 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 18×24×16 mm envelope, but catalogue C/C0 differ between the executions (7.92/11.2 vs 11.2/17.6 kN) — boundary dimensions match, not a load-rating equivalent. |
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 HK1816-2RS model number is decoded
For a 18 mm shaft in a thin housing wall, SKF catalogue execution HK 1816.2RS offers a 16 mm wide, 24 mm diameter pressed shell with caged needle rollers — the classic minimal-section drawn cup solution. The designation HK 1816.2RS encodes geometry only — there is no bore code to decode, since the 18 mm Fw is printed directly in the first digits and the cup width 16 mm in the last two. Sealed 2RS execution: rubber contact seals on both cup faces, factory grease fill, and the slightly lower ratings of a sealed drawn cup — 7.92 kN C against the open bearing of the same code. 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. Speed planning separates the two ceilings: no reference speed listed for this sealed/slow execution and 8,500 r/min mechanical limiting — needle bearings tolerate high rpm only with adequate lubricant film at the 18 mm seat. The shell is intentionally thin: seat it square with a slow press stroke, support the housing wall behind the bore, and stop the moment the cup face meets the shoulder — hammer blows split drawn cups.
Typical equipment & failure modes
Common applications
- idler gears and pulleys in small appliance drives
- spindle clusters of drilling and tapping units
- auto steering gear rack supports
- clutch release mechanisms and cable pulleys
Known failure patterns
- needle edge loading and raceway denting when the shaft deflects beyond the compensation range
- 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
- false brinelling of standby equipment under external vibration
Selection pitfalls — read before you substitute
- On a 18 mm seat the housing bore quality dominates life: a bore 0.02 mm out of round pinches the 24 mm ring or cup into a lobed shape, and the rollers then trace the housing's geometry error, not the design load.
- Contamination, not fatigue, kills most small needle bearings: with raceways this narrow, one hard particle dents a full-width line — seal the housing even when the bearing execution itself is open.
- Do not interchange envelope-identical needle families blindly: HK 1816.2RS shares its 18×24×16 mm outline with inner-ring and sealed siblings whose ratings differ — the family letters are part of the specification, not decoration.
- The 7.92/11.2 kN ratings and 15 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
Which dimensions does the HK 1816.2RS have?
A HK 1816.2RS measures 18 mm bore/Fw × 24 mm outside diameter × 16 mm width (0.709 × 0.945 × 0.63 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 7.92 kN, static C0 11.2 kN, fatigue limit Pu 1.27 kN, limiting speed 8,500 r/min, mass about 15 g.
What does HK 1816.2RS mean in SKF part numbering?
HK = open-end drawn cup needle roller bearing (ISO 3245); the first two digits give Fw 18 mm, the last two the width 16 mm, the shell OD 24 mm follows the plan. 2RS adds both-side contact seals, TN the polymer cage.
Does the HK 1816.2RS need a hardened and ground shaft?
No. In this execution the 18 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 1816.2RS?
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.
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.