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Extra Small / Miniature Deep Groove Ball Bearing Inch SeriesDeep Groove Ball BearingsMetal Shields

R4B ZZ

d 6.35 × D 15.875 × B 4.978 mm

The R4B ZZ is a deep groove ball bearing with bore 6.35mm, outer diameter 15.875mm, and width 4.978mm rated for dynamic load 1.6 kN.

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NOMINAL DIMENSION DRAWINGD = 15.875 mmd = 6.35 mmB = 4.978 mmNLHB BEARINGSR4B ZZ6.35 × 15.875 × 4.978 mmNOMINAL DIMENSIONS • TOLERANCE AND SUPPLY CONFIRMED PER INQUIRY
R4B ZZ · 6.35x15.875x4.978 mm

📋 Technical Specifications

Bore (d)
6.35mm
Outer Dia. (D)
15.875mm
Width (B)
4.978mm
Dynamic Load (Cr)
1.61 kN(1610 N)
Static Load (C0r)
0.66 kN(660 N)
Reference Speed
38000rpm
Bearing typeDeep Groove Ball Bearings
SeriesExtra Small / Miniature Deep Groove Ball Bearing Inch Series
Seal typeMetal Shields
MaterialConfirmed per inquiry — grade and certificate availability reviewed before quotation
Bore typeConfirmed per drawing
Dimension unitmillimeter (mm)

📐 Detailed Dimensions

Basic dimensions (mm)

Bore diameter (d)6.35
Outer diameter (D)15.875
Width (B)4.978

Corner radius, shoulder dimensions, fits and tolerances are confirmed against the requested suffix and application drawing before quotation.

📑 Drawings & 3D Model

R4B ZZ bearing dimension drawing, 6.35 x 15.875 x 4.978 mm
R4B ZZ dimension drawing: bore d 6.35 mm × outer diameter D 15.875 mm × width B 4.978 mm. Tolerance class ABEC-1 (P0). Internal design is shown schematically.
📑
2D Drawing (PDF)
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📐
2D DXF File
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📅
3D STEP Model
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The PDF drawing is free to download. DXF and 3D STEP files are sent on request: tell us the model and your application, and we reply with the CAD files.

⚡ Source-Data Reference Speed

Catalog reference
38,000 rpm

Lubrication method and application speed limit are confirmed per inquiry; no oil-speed value is derived from this number.

⇄ Same-size Bearings & Reference Options

The models below share the 6.35x15.875x4.978 mm boundary dimensions. Matching d/D/B alone does not prove interchangeability; verify seals, clearance, ring features, load ratings, fits, and application conditions before replacement.

ModelRelationshipSeriesSealAction
FR4BSame boundary dimensions — verify fit/loadMR Miniature SeriesOpenQuote →
FR4BZZSame boundary dimensions — verify fit/loadMR Miniature SeriesOpenQuote →
NR4Different outer-ring featureDeep Groove Bearings with Snap-Ring GrooveOpenQuote →
NR4 2RZDifferent outer-ring featureDeep Groove Bearings with Snap-Ring GrooveRubber SealsQuote →
NR4 ZZDifferent outer-ring featureDeep Groove Bearings with Snap-Ring GrooveMetal ShieldsQuote →
R4Same boundary dimensions — verify fit/loadInch R / 1600 SeriesOpenQuote →
R4 2rsSame boundary dimensions — verify fit/loadInch R SeriesSealedQuote →
R4BConfiguration variantMR Miniature SeriesOpenQuote →
R4zzSame boundary dimensions — verify fit/loadInch R SeriesShieldedQuote →
RW4Same boundary dimensions — verify fit/loadInch RW SeriesOpenQuote →
RW4zzSame boundary dimensions — verify fit/loadInch RW SeriesShieldedQuote →

⚙ Typical Applications

Electric motors
Fans and blowers
Pumps
Household appliances
Power tools
Office equipment
General machinery

Why choose NLHB?

NLHB supports both in-house manufacturing and qualified partner sourcing. We confirm the specification, supply route, inspection requirements, and available documentation before quotation.

About NLHB →
4,300+
Models
15+
Years
RFQ
Specification Confirmed

❓ Frequently Asked Questions

What are the dimensions of R4B ZZ?
The R4B ZZ bearing has bore (d) = 6.35 mm, outer diameter (D) = 15.875 mm, and width (B) = 4.978 mm.
Is there a R4B ZZ drawing or CAD file?
Yes. The R4B ZZ dimension drawing (PDF) is free to download on this page. DXF and 3D STEP files are sent on request: tell us the model and your application.
What is the load rating of R4B ZZ?
Dynamic load rating (Cr) = 1.61 kN (1610 N), static load rating (C0r) = 0.66 kN.
What tolerance class is the R4B ZZ?
The standard tolerance class of the R4B ZZ is ABEC-1 (P0) per GB/T 307.1, unless otherwise agreed.
What bearing series does R4B ZZ belong to?
The R4B ZZ belongs to the Extra Small / Miniature Deep Groove Ball Bearing Inch Series within the Deep Groove Ball Bearings category.
Can NLHB supply R4B ZZ equivalents from other brands?
Depending on the model and order requirements, NLHB may manufacture in-house or source through qualified partner factories. Interchange and supply route are confirmed against your specification before quotation. All trademarks belong to their respective owners.
How do I order R4B ZZ from NLHB?
Click "Request Quote" and send us your quantity, application, and required specifications. We review the specification, supply route, lead time, and pricing before issuing a quotation. Response time depends on specification complexity.
What materials are available for R4B ZZ?
Material grade is confirmed per inquiry. Availability depends on the model, quantity, application, and whether the order is manufactured in-house or sourced through a qualified partner factory. Material certificates or inspection documents are confirmed before quotation when required.

Get a quote for R4B ZZ

Send us your quantity, application and target lead time. We confirm spec, interchange and realistic delivery — no order confirmed until you approve.

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