HK1522ZWFD bearing: complete specifications & equivalents
The HK1522ZWFD is a ISO 3245 radial bearing sized 15 x 21 x 22 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 15 mm |
| Outer diameter D | 21 mm |
| Width B | 22 mm |
| Seal / shield | open |
| Basic dynamic load rating C | 12.9 kN |
| Basic static load rating C0 | 18.2 kN |
| Fatigue load limit Pu | 2.22 kN |
| Limiting speed (mechanical) | 11000 rpm |
| Mass | 20 g |
| Manufacturer designation | HK1522ZWFD |
| 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 | 0.591 in |
|---|---|
| Outer diameter D | 0.827 in |
| Width B | 0.866 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) | 12 of 24 |
| Bore above smallest HK-series size | 12 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the HK1522ZWFD model number is decoded
NTN HK1522ZWFD belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 15 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 21 mm outside and 22 mm across. 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 ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. Automotive steering-column and pedal-box pivots use this size, where the cup is pressed into a sheet-metal bracket and the shaft sees only slow, heavily loaded oscillation. Never re-grease through a drilled hole in the housing wall without a vent path: pressure builds behind the cup, blows grease past the rollers, and starves the bearing while the housing looks full.
Typical equipment & failure modes
Common applications
- automotive manual transmission gear sets
- industrial gearbox lay shafts
- hydraulic pump and motor 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
- The 22 mm wide section of HK1522ZWFD gains rating through longer rollers at 15 mm shaft; confirm the housing width accepts 22 mm — it will not drop into a seat machined for the 15×21 mm narrow variant.
- The open ends of HK1522ZWFD retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.
- At a 15 mm shaft diameter, check housing bore roundness after previous bearing removal for HK1522ZWFD; a pulled or scored seat must be re-machined or sleeved before the new cup goes in.
- The two roller rows in HK1522ZWFD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 21 mm seat straight over the full 22 mm width and keep shaft deflection minimal.
Frequently asked questions
Can a HK1522ZWFD needle roller bearing carry axial load?
No. Drawn-cup needle roller bearings like HK1522ZWFD 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 HK1522ZWFD need a hardened shaft?
Either the 15 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 (IR12x15x22.5) so a standard unhardened shaft can be used.
What are the dimensions of a HK1522ZWFD needle roller bearing?
A HK1522ZWFD drawn-cup needle roller bearing has a 15 mm shaft diameter (Fw, under-roller diameter), 21 mm outside diameter and 22 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 HK1522ZWFD drawn-cup bearing?
Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1522ZWFD, Fw = 15 mm, so the shaft must be machined to 15 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.