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Brand:OTOTRI
Product origin:China
Delivery time:3-5 days
Supply capacity:Mass production
HK263133ZW Double Row Drawn Cup Needle Roller Bearing — 26 × 31 × 33 mm
HK263133ZW is a double row drawn cup needle roller bearing — an HK cup with two roller rows running side by side in the same drawn outer ring. The designation reads 26 mm bore (Fw), 31 mm outside diameter and 33 mm cup width, which puts roughly twice the roller complement of a 16 mm wide single row cup into a 2.5 mm wall. The cup presses into a 31 mm housing bore and the shaft remains the inner raceway. Standard GCr15 rollers, steel cage, P0/P6; produced to drawing with the load ratings confirmed at quotation.
HK263133ZW Specifications
| Designation | HK263133ZW |
| Type | Drawn cup needle roller bearing, double row (ZW), open both ends |
| Bore diameter Fw | 26 mm * |
| Outside diameter D | 31 mm * |
| Cup width C | 33 mm * |
| Outer ring | Cold-rolled steel cup, case hardened, with lubrication hole |
| Rollers | GCr15 (100Cr6), ground, gauge-sorted |
| Cage | Steel |
| Tolerance class | P0 standard, P6 on request |
| Shaft requirement | 58–62 HRC, Ra ≤ 0.2 µm, h5/h6 |
| Housing bore | N7 press fit |
| Operating temperature | −30 °C to +120 °C (grease-dependent) |
| MOQ | 100 pcs |
* Dimensions follow our designation system (HK + Fw + D + C, as in HK2538 = 25 × 32 × 38). Confirm against the drawing before you design the housing.
What the ZW Suffix Changes
| Aspect | Single row HK | Double row HK…ZW |
|---|---|---|
| Roller rows | One | Two, side by side in the same cup |
| Radial capacity | Baseline | Roughly double at the same OD |
| Width for the same capacity | Needs a longer cup | Shorter, or same width at higher load |
| Speed | Higher | Lower — more rollers, more heat |
| Lubrication | Grease fill is enough at low speed | A lubrication hole in the cup is normal |
| Misalignment | Poor — radial location only | Same or worse; never use it to absorb misalignment |
The trade is capacity against speed and lubrication. If the duty is high load at moderate speed and the housing bore is fixed at 31 mm, the double row cup is the right answer; if it is high speed at light load, a wider single row cup runs cooler.
25–30 mm Bore Size Chart — 18 Sizes
| Designation | Type | Fw | D | C | Cr (kN) | C0r (kN) | Pu (kN) | Speed ref / limit | Mass (kg) |
|---|---|---|---|---|---|---|---|---|---|
| HK 2516 | HK | 25 | 32 | 16 | 15.1 | 24 | 2.85 | 9 500 / 11 000 | 0.027 |
| HK 2520 | HK | 25 | 32 | 20 | 19 | 32.5 | 4 | 8 000 / 10 000 | 0.04 |
| HN 2520 | HN | 25 | 32 | 20 | 26.4 | 60 | 7.2 | 10 000 / 8 000 | 0.04 |
| BK 2520 | BK | 25 | 32 | 20 | 19 | 32.5 | 4 | 9 500 / 11 000 | 0.038 |
| HK 2526 | HK | 25 | 32 | 26 | 24.2 | 45 | 5.5 | 9 500 / 11 000 | 0.044 |
| BK 2526 | BK | 25 | 32 | 26 | 24.2 | 45 | 5.5 | 9 500 / 11 000 | 0.048 |
| HK 2538 | HK dbl | 25 | 32 | 38 | 33 | 65.5 | 8 | 9 500 / 11 000 | 0.064 |
| BK 2538 | BK dbl | 25 | 32 | 38 | 33 | 65.5 | 8 | 9 500 / 11 000 | 0.068 |
| HK 2816 | HK | 28 | 35 | 16 | 15.7 | 26.5 | 3.15 | 9 000 / 9 500 | 0.029 |
| HK 2820 | HK | 28 | 35 | 20 | 20.1 | 36.5 | 4.4 | — / 9 500 | 0.036 |
| HN 2820 | HN | 28 | 35 | 20 | 28.1 | 68 | 8.15 | 7 000 / 9 000 | 0.044 |
| HK 3016 | HK | 30 | 37 | 16 | 16.5 | 29 | 3.4 | 8 000 / 9 000 | 0.031 |
| HK 3020 | HK | 30 | 37 | 20 | 20.9 | 40 | 4.75 | 8 000 / 9 000 | 0.039 |
| BK 3020 | BK | 30 | 37 | 20 | 20.9 | 40 | 4.75 | 8 000 / 9 000 | 0.047 |
| HK 3022 | HK | 30 | 37 | 22 | 23.8 | 46.5 | 5.6 | 8 000 / 9 000 | 0.042 |
| HK 3026 | HK | 30 | 37 | 26 | 27 | 54 | 6.55 | 8 000 / 9 000 | 0.051 |
| BK 3026 | BK | 30 | 37 | 26 | 27 | 54 | 6.55 | 8 000 / 9 000 | 0.058 |
| HK 3038 | HK dbl | 30 | 37 | 38 | 35.8 | 80 | 9.5 | 8 000 / 9 000 | 0.076 |
Rows marked dbl are the double row cups in our current range. They show what the ZW layout buys inside a fixed outside diameter:
| Cup | D × C | Cr | Compared with |
|---|---|---|---|
| HK2516 | 32 × 16 | 15.1 kN | baseline single row |
| HK2526 | 32 × 26 | 24.2 kN | +60% for +10 mm width |
| HK2538 (dbl) | 32 × 38 | 33 kN | +119% over HK2516, same 32 mm OD |
| HK3016 | 37 × 16 | 16.5 kN | baseline single row |
| HK3038 (dbl) | 37 × 38 | 35.8 kN | +117% over HK3016 |
Capacity scales with the number of rollers that fit, not with the type name. A double row cup is the way to get there when axial space is the limit.
Typical Applications
| Application | Why a double row cup |
|---|---|
| Industrial gearboxes and reducers | High radial load on a short pin in a 31 mm bore envelope |
| Hydraulic pumps and motors | Compact, press-fit seat, no inner ring |
| Agricultural and construction linkages | Shock load on a hardened pin |
| Conveyor and roller drives | Wide load band with limited axial space |
| Textile and printing machinery | Stiff shaft support in a thin wall |
Shaft, Housing and Installation
- Shaft: 58–62 HRC, ground Ra ≤ 0.2 µm, h5/h6. A double row cup carries more load per mm of shaft, so a soft shaft fails faster here than in a single row part.
- Housing: N7 press fit, R7 for thin-wall aluminium; the 31 mm bore should be round within IT6 — a double row cup has less tolerance for an oval seat.
- Press on the stamped face with a flat arbor; never load the cage.
- Lubrication hole: orient it to the grease passage in the housing, not against a blind wall.
- Alignment: two rows share the load only if shaft and bore are parallel; angular error loads one row and roughly halves the life.
Quality Control on Every Batch
- 100% dimensional check on Fw, D and C
- Row-to-row roller count and gauge class verified
- Case depth and hardness on the cup
- Rotation torque and noise sampled per lot
- Lubrication hole position checked
- 3.1 material certificate and inspection report with the shipment
Packing, MOQ and Delivery
10 pcs per bag, cartons on a pallet or in a plywood case. MOQ 100 pcs; drawing-based production 20–30 days, samples 7–10 days after drawing approval. Air, sea LCL and FCL.
Frequently Asked Questions
What does HK263133ZW mean?
HK is the drawn cup series, 26 is the bore Fw, 31 the outside diameter and 33 the cup width in mm; ZW marks the double row version.
What are the load ratings?
They depend on the roller complement in the drawing, so we quote Cr, C0r and the fatigue limit with the offer rather than publish a generic figure.
Is a double row cup stronger than a wider single row cup?
At the same outside diameter it carries roughly twice the rollers of a single row cup of the same width, so yes for radial load — but it runs hotter and slower, and it needs a lubrication path.
Can HK263133ZW take axial load?
No. A drawn cup locates radially; axial location must come from a shoulder, a ring or a separate thrust bearing.
Can I use it on a soft shaft?
Not recommended. The bearing relies on the shaft as its inner raceway; harden and grind it to 58–62 HRC.
What is the MOQ and lead time?
100 pcs, 20–30 days from drawing approval, with samples in 7–10 days.
Send the drawing, get the rating sheet
Bore, OD, width, load and speed are enough for us to come back with Cr, C0r, speed limits and price within 24 hours on working days.