HK1712FM bearing: complete specifications & equivalents
The HK1712FM is a ISO 3245 radial bearing sized 17 x 23 x 12 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 17 mm |
| Outer diameter D | 23 mm |
| Width B | 12 mm |
| Seal / shield | open |
| Basic dynamic load rating C | 8.05 kN |
| Basic static load rating C0 | 10.3 kN |
| Fatigue load limit Pu | 1.26 kN |
| Limiting speed (mechanical) | 9500 rpm |
| Mass | 12 g |
| Manufacturer designation | HK1712FM |
| 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 | 0.669 in |
|---|---|
| Outer diameter D | 0.906 in |
| Width B | 0.472 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 3 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) | 14 of 24 |
| Bore above smallest HK-series size | 14 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the HK1712FM model number is decoded
As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1712FM is built around a thin hardened steel cup.Its printed envelope — 17 mm under-roller diameter, 23 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 17 mm figure is the shaft journal itself, which carries the rollers directly. 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. 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 compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.
Typical equipment & failure modes
Common applications
- industrial gearbox lay shafts
- hydraulic pump and motor shafts
- compressor crankshaft supports
- lightly loaded high-speed idler positions where roller skidding must be watched
Known failure patterns
- cage wear or fracture from sustained operation near the limiting speed
- cup cracking from an oval or tapered housing bore distorting the thin shell
- fretting of the cup outer surface in a soft or worn housing seat
Selection pitfalls — read before you substitute
- The HK1712FM drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.
- Mid-size cups like HK1712FM (17 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.
- The cage in HK1712FM 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 17 mm.
- The 12 mm standard width of HK1712FM is the general-purpose section at 17 mm shaft; wider HK variants in the same 17×23 mm envelope carry more load and are not interchangeable if the housing width is fixed.
Frequently asked questions
How is a HK1712FM retained in the housing?
The thin-walled drawn cup of HK1712FM is press-fitted into a 23 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid.
What are the dimensions of a HK1712FM needle roller bearing?
A HK1712FM drawn-cup needle roller bearing has a 17 mm shaft diameter (Fw, under-roller diameter), 23 mm outside diameter and 12 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 HK1712FM drawn-cup bearing?
Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1712FM, Fw = 17 mm, so the shaft must be machined to 17 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted.
Can a HK1712FM needle roller bearing carry axial load?
No. Drawn-cup needle roller bearings like HK1712FM 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.