HK2030ZWFD bearing: complete specifications & equivalents
The HK2030ZWFD is a ISO 3245 radial bearing sized 20 x 26 x 30 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 20 mm |
| Outer diameter D | 26 mm |
| Width B | 30 mm |
| Seal / shield | open |
| Basic dynamic load rating C | 21.5 kN |
| Basic static load rating C0 | 38.5 kN |
| Fatigue load limit Pu | 4.7 kN |
| Limiting speed (mechanical) | 8000 rpm |
| Mass | 35 g |
| Manufacturer designation | HK2030ZWFD |
| 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 | 0.787 in |
|---|---|
| Outer diameter D | 1.024 in |
| Width B | 1.181 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) | 16 of 24 |
| Bore above smallest HK-series size | 17 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the HK2030ZWFD model number is decoded
In the HK-series (ISO 3245), HK2030ZWFD is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 30 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 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. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. Marine outboard and small diesel linkage points use this size: the pressed-in cup tolerates the corrosion-prone environment better than a machined ring with a separate inner race. In high-speed applications, switch from grease to a circulating oil supply: the open ends let oil through, but grease at high speed channels and overheats the roller set.
Typical equipment & failure modes
Common applications
- agricultural machinery PTO drives
- universal joint and steering pivots
- automotive manual transmission gear sets
- compact linkages where the cup doubles as both bearing and structural spacer
Known failure patterns
- 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
- edge loading and needle skewing under shaft misalignment or deflection
Selection pitfalls — read before you substitute
- The open ends of HK2030ZWFD retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.
- Before pressing HK2030ZWFD in, verify the 20 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.
- The two roller rows in HK2030ZWFD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 26 mm seat straight over the full 30 mm width and keep shaft deflection minimal.
- The 30 mm extra-wide section of HK2030ZWFD (double-row or extended roller set) is the high-capacity option at 20 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 30 mm width.
- HK2030ZWFD runs directly on the shaft: the 20 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.
Frequently asked questions
What duty conditions suit a HK2030ZWFD drawn-cup bearing?
HK2030ZWFD is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (8000/12000 rpm) and radial load against the actual duty before finalizing.
What are the dimensions of a HK2030ZWFD needle roller bearing?
A HK2030ZWFD drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 30 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 HK2030ZWFD drawn-cup bearing?
Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2030ZWFD, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted.
Can a HK2030ZWFD needle roller bearing carry axial load?
No. Drawn-cup needle roller bearings like HK2030ZWFD 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 HK2030ZWFD need a hardened shaft?
Either the 20 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 (IR17x20x30.5) so a standard unhardened shaft can be used.
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.