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MR Miniature SeriesDeep Groove Ball Bearings

R188

d 6.35 × D 12.7 × B 3.175 mm

The R188 is a deep groove ball bearing with bore 6.35mm, outer diameter 12.7mm, and width 3.175mm rated for dynamic load 1.2 kN.

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R188 — representative product photo
Representative product
R188 · 6.35x12.7x3.175 mm

📋 Technical Specifications

Bore (d)
6.35mm
Outer Dia. (D)
12.7mm
Width (B)
3.175mm
Dynamic Load (Cr)
1.19 kN(1190 N)
Static Load (C0r)
0.44 kN(440 N)
Reference Speed
40000rpm
Bearing typeDeep Groove Ball Bearings
SeriesMR Miniature Series
Seal typeOpen
MaterialConfirmed per inquiry — grade and certificate availability reviewed before quotation
Bore typeConfirmed per drawing
Dimension unitmillimeter (mm)

📋 Nominal Variants by Seal Type

Catalog variants open a detail page. Inquiry-only configurations go directly to RFQ.

Seal TypeModel CodeTypical Use
Double metal shieldsR188 ZZGeneral dust protectionQuote →
Double contact rubber sealsR188 2RS (inquiry only)Dust and moisture protection at moderate speedQuote →
Double non-contact rubber sealsR188 2RZ (inquiry only)Lower-friction sealing at higher speedQuote →
C3 radial clearanceR188 C3 (inquiry only)Motors and applications with higher operating temperatureQuote →

📐 Detailed Dimensions

Basic dimensions (mm)

Bore diameter (d)6.35
Outer diameter (D)12.7
Width (B)3.175

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

📑 Drawings & 3D Model

R188 bearing dimension drawing, 6.35 x 12.7 x 3.175 mm
R188 dimension drawing: bore d 6.35 mm × outer diameter D 12.7 mm × width B 3.175 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
40,000 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 6.35x12.7x3.175 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
RW188Same boundary dimensions — verify fit/loadInch RW SeriesOpenQuote →

🔄 Related Models

Same bearing family or similar dimensions.

Same model family — dimensions may differ
R188 2rs
6.35x12.7x4.762 mm
Inch R Series
B +1.6mm
R188 ZZ
6.35x12.7x4.762 mm
Extra Small / Miniature Deep Groove Ball Bearing Inch Series
B +1.6mm

⚙ 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 R188?
The R188 bearing has bore (d) = 6.35 mm, outer diameter (D) = 12.7 mm, and width (B) = 3.175 mm.
Is there a R188 drawing or CAD file?
Yes. The R188 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 R188?
Dynamic load rating (Cr) = 1.19 kN (1190 N), static load rating (C0r) = 0.44 kN.
What tolerance class is the R188?
The standard tolerance class of the R188 is ABEC-1 (P0) per GB/T 307.1, unless otherwise agreed.
What bearing series does R188 belong to?
The R188 belongs to the MR Miniature Series within the Deep Groove Ball Bearings category.
Can NLHB supply R188 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 R188 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 R188?
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 R188

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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