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NNU4956- K-W33 — 280 × 380 × 100 mm

BOUNDARY DIMENSIONSUNIT / mm
B = 100 mmD = 380 mmd = 280 mm
Boundary dimensions · schematic, not a product photograph or manufacturing drawing.
Cylindrical roller

NNU4956- K-W33

NNU4956- K-W33 is a cylindrical roller designation documented on BearingIndex from 1 manufacturer publication. The published boundary dimensions are 280 × 380 × 100 mm. The designation ends in bore code 56, which resolves to a 280 mm bore under ISO 15 and matches what the manufacturers published. The publishing works are in Zhejiang province, China. Every value below comes from that manufacturer’s own published material, with the date it was recorded.

Bore d
280 mm
Outside D
380 mm
Width B
100 mm

Compare the 1 publication

What each manufacturer published.

ManufacturerLimiting speed — grease (rpm)Limiting speed — oil (rpm)Reference mass (kg)Source recorded
YJB
NNU4956- K-W33		1900240031.62026-09-24Request

A dash means that manufacturer did not publish the value. Dimensions every source agrees on are shown above rather than repeated per row.

Calculated from the published values.

FigureHow it is obtainedResult
Radial section height(D − d) / 250 mm
Mean diameter dm(D + d) / 2330 mm
Speed factor dm · nmean diameter × highest published limiting speed792,000 mm·min−1

Arithmetic on the figures above — not a bearing life calculation for your load case.

The works that publish NNU4956- K-W33.

YJB

Hangzhou, Zhejiang, China

Precision spindle and machine-tool bearings

Hangzhou Yijia manufactures precision bearings within the Huaxing group. Its published range includes angular contact ball bearings, cylindrical roller bearings, double-direction thrust angular contact bearings and tapered roller designs. The company describes controlled grinding and assembly environments and applications in machine-tool spindles, medical equipment, instrument motors and robots.

Published ranges: Angular contact ball bearings · Cylindrical roller bearings · Double-direction thrust angular contact bearings · Tapered roller and nonstandard designs

740 designations documented here · 1 reviewed evidence record · source recorded 2026-09-24

Ask YJB about NNU4956- K-W33

Applications the publishing works state.

ApplicationStated by
Instrument motorsYJB
Machine-tool spindlesYJB
Medical equipmentYJB
RoboticsYJB

Application areas each manufacturer states for its own range. Confirm load, speed, temperature and lubrication for your case.

Not documented by any source here.

Precision class · Internal clearance · Sealing · Material · Cage material · Z class · V class · Dynamic load rating · Static load rating · Limiting speed · Lubrication · Operating temperature · Precision standard · Ring material · Rolling element material · Noise / vibration test method · Manufacturer series · Manufacturer suffix · Ball count · Ball diameter.

Ask the manufacturer for these when you enquire.

Other designations with the same 280x380x100 mm envelope.

DesignationBearing familyWorks
NNC4956CVCylindrical roller1

Same envelope, but sealing, internal design, clearance and load capability differ — not interchangeable by default.

Neighbouring designations documented here.

DesignationEnvelope d × D × B (mm)Bearing familyWorks
NNU4914-K-W3370 × 100 × 30Cylindrical roller1
NNU4915-K-W3375 × 105 × 30Cylindrical roller1
NNU4916-K-W3380 × 110 × 30Cylindrical roller1
NNU4917-K-W3385 × 120 × 35Cylindrical roller1
NNU4919-K-W3395 × 130 × 35Cylindrical roller1
NNU4920-K-W33100 × 140 × 40Cylindrical roller1
NNU4921- K-W33105 × 145 × 40Cylindrical roller1
NNU4922- K-W33110 × 150 × 40Cylindrical roller1
NNU4924- K-W33120 × 165 × 45Cylindrical roller1
NNU4926- K-W33130 × 180 × 50Cylindrical roller1
NNU4928- K-W33140 × 190 × 50Cylindrical roller1
NNU4930- K-W33150 × 210 × 60Cylindrical roller1
NNU4932- K-W33160 × 220 × 60Cylindrical roller1
NNU4934- K-W33170 × 230 × 60Cylindrical roller1
NNU4936- K-W33180 × 250 × 69Cylindrical roller1
NNU4938- K-W33190 × 260 × 69Cylindrical roller1
NNU4940- K-W33200 × 280 × 80Cylindrical roller1
NNU4944- K-W33220 × 300 × 80Cylindrical roller1

Each envelope shown is that designation’s own published size.

Request a quote for NNU4956- K-W33.

Tick the works you want above, then send one enquiry — each manufacturer answers you separately and cannot see the others.

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Figures on this page are each manufacturer’s own published material, recorded on the dates shown. How we check sources →

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