HK2816CT bearing: complete specifications & equivalents
The HK2816CT is a ISO 3245 radial bearing sized 28 x 35 x 16 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 28 mm |
| Outer diameter D | 35 mm |
| Width B | 16 mm |
| Seal / shield | open |
| Basic dynamic load rating C | 16.7 kN |
| Basic static load rating C0 | 26.4 kN |
| Fatigue load limit Pu | 3.2 kN |
| Limiting speed (mechanical) | 5500 rpm |
| Mass | 30 g |
| Manufacturer designation | HK2816CT |
| 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 | 1.102 in |
|---|---|
| Outer diameter D | 1.378 in |
| Width B | 0.63 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) | 19 of 24 |
| Bore above smallest HK-series size | 25 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the HK2816CT model number is decoded
The NTN HK2816CT — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 28 mm is Fw, the under-roller (shaft journal) diameter; 35 mm and 16 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. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. 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
- heavy gearbox and final drive shafts
- construction equipment swing pivots
- printing press cylinder journals
- 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 press-fit of HK2816CT at 28 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.
- HK2816CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 28×35×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.
- The 16 mm standard width of HK2816CT is the general-purpose section at 28 mm shaft; wider HK variants in the same 28×35 mm envelope carry more load and are not interchangeable if the housing width is fixed.
- Needle rollers tolerate almost no misalignment; if the 35 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.
- 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.
Frequently asked questions
What are the dimensions of a HK2816CT needle roller bearing?
A HK2816CT drawn-cup needle roller bearing has a 28 mm shaft diameter (Fw, under-roller diameter), 35 mm outside diameter and 16 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 HK2816CT drawn-cup bearing?
Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2816CT, Fw = 28 mm, so the shaft must be machined to 28 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted.
Can a HK2816CT needle roller bearing carry axial load?
No. Drawn-cup needle roller bearings like HK2816CT 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 HK2816CT need a hardened shaft?
Either the 28 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 (IR22x28x17) so a standard unhardened shaft can be used.
What duty conditions suit a HK2816CT drawn-cup bearing?
HK2816CT is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (5500/8500 rpm) and radial load against the actual duty before finalizing.
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.