HK2526C bearing: complete specifications & equivalents
The HK2526C is a ISO 3245 radial bearing sized 25 x 32 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 | 25 mm |
| Outer diameter D | 32 mm |
| Width B | 26 mm |
| Seal / shield | open |
| Basic dynamic load rating C | 26.4 kN |
| Basic static load rating C0 | 46 kN |
| Fatigue load limit Pu | 5.6 kN |
| Limiting speed (mechanical) | 6500 rpm |
| Mass | 45 g |
| Manufacturer designation | HK2526C |
| 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 | 0.984 in |
|---|---|
| Outer diameter D | 1.26 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) | 18 of 24 |
| Bore above smallest HK-series size | 22 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the HK2526C model number is decoded
The NTN HK2526C — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 25 mm is Fw, the under-roller (shaft journal) diameter; 32 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 trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Small electric actuators and valve gear specify this size on the output shaft, where the gearmotor pinion needs support but the casting leaves no room for a machined ring. In dusty environments, place an external lip seal or felt washer immediately adjacent to the open cup end; the rollers have no defence against grit that migrates through the housing.
Typical equipment & failure modes
Common applications
- universal joint and steering pivots
- automotive manual transmission gear sets
- industrial gearbox lay shafts
- reciprocating or oscillating motion where the rollers never complete a full revolution
Known failure patterns
- raceway spalling on a shaft that was below the required 58–64 HRC hardness
- edge loading and needle skewing under shaft misalignment or deflection
- cage wear or fracture from sustained operation near the limiting speed
Selection pitfalls — read before you substitute
- Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.
- Mid-size cups like HK2526C (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.
- HK2526C carries a maker-specific variant code after the size: when substituting another brand, match the printed 25×32×26 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.
- The 26 mm extra-wide section of HK2526C (double-row or extended roller set) is the high-capacity option at 25 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 26 mm width.
Frequently asked questions
Does HK2526C need a hardened shaft?
Either the 25 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 (IR20x25x26.5) so a standard unhardened shaft can be used.
What are the dimensions of a HK2526C needle roller bearing?
A HK2526C drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 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 HK2526C drawn-cup bearing?
Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2526C, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted.
Can a HK2526C needle roller bearing carry axial load?
No. Drawn-cup needle roller bearings like HK2526C 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.
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.