HK3026F bearing: complete specifications & equivalents
The HK3026F is a ISO 3245 radial bearing sized 30 x 37 x 26 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 30 mm |
| Outer diameter D | 37 mm |
| Width B | 26 mm |
| Seal / shield | open |
| Basic dynamic load rating C | 28.5 kN |
| Basic static load rating C0 | 54 kN |
| Fatigue load limit Pu | 6.55 kN |
| Limiting speed (mechanical) | 5500 rpm |
| Mass | 53 g |
| Manufacturer designation | HK3026F |
| Standard | ISO 3245 |
| Catalog version | CAT. No. 2203-3/E 2024 |
| Last verified | 2026-09-25 |
Source: catalog reference (CAT. No. 2203-3/E 2024) · extracted 2026-09-25
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (CAT. No. 2203-3/E 2024); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & HK-series range
| Bore d | 1.181 in |
|---|---|
| Outer diameter D | 1.457 in |
| Width B | 1.024 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 3.5 mm |
| Smallest bore in HK-series | 3 mm |
| Largest outer diameter in HK-series | 58 mm |
| Width range across HK-series | 6–38 mm |
| Bore position in HK-series (smallest first) | 20 of 24 |
| Bore above smallest HK-series size | 27 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the HK3026F model number is decoded
The NTN HK3026F — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 30 mm is Fw, the under-roller (shaft journal) diameter; 37 mm and 26 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.
Typical equipment & failure modes
Common applications
- marine steering and linkage shafts
- rolling mill auxiliary drives
- heavy gearbox and final drive shafts
- shock-loaded start-stop service such as clutch and kick-starter mechanisms
Known failure patterns
- edge loading and needle skewing under shaft misalignment or deflection
- cage wear or fracture from sustained operation near the limiting speed
- cup cracking from an oval or tapered housing bore distorting the thin shell
Selection pitfalls — read before you substitute
- The 26 mm extra-wide section of HK3026F (double-row or extended roller set) is the high-capacity option at 30 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 26 mm width.
- HK3026F runs directly on the shaft: the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.
- The open ends of HK3026F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.
- The press-fit of HK3026F at 30 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.
- The cage in HK3026F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 30 mm.
Frequently asked questions
Can a HK3026F needle roller bearing carry axial load?
No. Drawn-cup needle roller bearings like HK3026F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement.
Does HK3026F need a hardened shaft?
Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x26.5) so a standard unhardened shaft can be used.
What duty conditions suit a HK3026F drawn-cup bearing?
HK3026F is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (5500/8000 rpm) and radial load against the actual duty before finalizing.
What are the dimensions of a HK3026F needle roller bearing?
A HK3026F drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 26 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway.
What does Fw mean on a HK3026F drawn-cup bearing?
Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3026F, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted.
Reviewed & verified by the MPN Base engineering desk against source catalog CAT. No. 2203-3/E 2024 on 2026-09-25. Read our editorial & correction policy.