7E-HK3016C bearing: complete specifications & equivalents
The 7E-HK3016C is a ISO 3245 radial bearing sized 30 x 37 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 | 30 mm |
| Outer diameter D | 37 mm |
| Width B | 16 mm |
| Seal / shield | open |
| Basic dynamic load rating C | 18.1 kN |
| Basic static load rating C0 | 30 kN |
| Fatigue load limit Pu | 3.65 kN |
| Limiting speed (mechanical) | 5500 rpm |
| Mass | 32 g |
| Manufacturer designation | 7E-HK3016C |
| 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 | 1.181 in |
|---|---|
| Outer diameter D | 1.457 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) | 20 of 24 |
| Bore above smallest HK-series size | 27 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 7E-HK3016C model number is decoded
In the HK-series (ISO 3245), 7E-HK3016C is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 30 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 37 mm cup outside diameter and 16 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 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. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.
Typical equipment & failure modes
Common applications
- printing press cylinder journals
- machine tool feed drive supports
- marine steering and linkage shafts
- heavily loaded slow pivots where static rating, not dynamic life, governs the choice
Known failure patterns
- scoring of the needle rollers from abrasive contamination past the open ends
- brinelling of the drawn cup from hammer blows during press-in mounting
- grease starvation in the open-end arrangement with no relubrication path
Selection pitfalls — read before you substitute
- The 16 mm standard width of 7E-HK3016C is the general-purpose section at 30 mm shaft; wider HK variants in the same 30×37 mm envelope carry more load and are not interchangeable if the housing width is fixed.
- 7E-HK3016C runs directly on the shaft: the 30 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.
- The open ends of 7E-HK3016C retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.
- The press-fit of 7E-HK3016C at 30 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.
- 7E-HK3016C carries a maker-specific variant code after the size: when substituting another brand, match the printed 30×37×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.
Frequently asked questions
Can a 7E-HK3016C needle roller bearing carry axial load?
No. Drawn-cup needle roller bearings like 7E-HK3016C 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 7E-HK3016C need a hardened shaft?
Either the 30 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 (IR25x30x17) so a standard unhardened shaft can be used.
What duty conditions suit a 7E-HK3016C drawn-cup bearing?
7E-HK3016C is typically specified for reciprocating or oscillating motion where the rollers never complete a full revolution; match the grease/oil speed limits (5500/8000 rpm) and radial load against the actual duty before finalizing.
What are the dimensions of a 7E-HK3016C needle roller bearing?
A 7E-HK3016C drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 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 7E-HK3016C drawn-cup bearing?
Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For 7E-HK3016C, Fw = 30 mm, so the shaft must be machined to 30 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.