HK1010FM bearing: complete specifications & equivalents
The HK1010FM is a ISO 3245 radial bearing sized 10 x 14 x 10 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 10 mm |
| Outer diameter D | 14 mm |
| Width B | 10 mm |
| Seal / shield | open |
| Basic dynamic load rating C | 4.5 kN |
| Basic static load rating C0 | 5.1 kN |
| Fatigue load limit Pu | 0.62 kN |
| Limiting speed (mechanical) | 16000 rpm |
| Mass | 4 g |
| Manufacturer designation | HK1010FM |
| 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 | 0.394 in |
|---|---|
| Outer diameter D | 0.551 in |
| Width B | 0.394 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 2 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) | 8 of 24 |
| Bore above smallest HK-series size | 7 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the HK1010FM model number is decoded
In the HK-series (ISO 3245), HK1010FM is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 10 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 14 mm cup outside diameter and 10 mm width. 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 FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.
Typical equipment & failure modes
Common applications
- automotive accessory drives
- lawn and garden equipment spindles
- motorcycle and scooter transmissions
- intermittent duty with long standstill periods that invite false brinelling
Known failure patterns
- brinelling of the drawn cup from hammer blows during press-in mounting
- grease starvation in the open-end arrangement with no relubrication path
- raceway spalling on a shaft that was below the required 58–64 HRC hardness
Selection pitfalls — read before you substitute
- The 10 mm narrow section of HK1010FM is the compact option at 10 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 10×14 mm envelope.
- The open ends of HK1010FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.
- With no inner ring, HK1010FM reads the 10 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.
- The cage in HK1010FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 10 mm.
Frequently asked questions
Can a HK1010FM needle roller bearing carry axial load?
No. Drawn-cup needle roller bearings like HK1010FM 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 HK1010FM need a hardened shaft?
Either the 10 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 (IR7x10x10.5) so a standard unhardened shaft can be used.
What are the dimensions of a HK1010FM needle roller bearing?
A HK1010FM drawn-cup needle roller bearing has a 10 mm shaft diameter (Fw, under-roller diameter), 14 mm outside diameter and 10 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 HK1010FM drawn-cup bearing?
Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1010FM, Fw = 10 mm, so the shaft must be machined to 10 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.