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R188TZZ — 6.35 × 12.7 × 4.7625 mm

BOUNDARY DIMENSIONSUNIT / mm
B = 4.7625 mmD = 12.7 mmd = 6.35 mm
Boundary dimensions · schematic, not a product photograph or manufacturing drawing.
Ball bearings

R188TZZ

R188TZZ is a ball bearings designation documented on BearingIndex from 1 manufacturer publication. The published boundary dimensions are 6.35 × 12.7 × 4.7625 mm. The publishing works are in Fujian province, China. Every value below comes from that manufacturer’s own published material, with the date it was recorded.

Bore d
6.35 mm
Outside D
12.7 mm
Width B
4.7625 mm

Compare the 1 publication

What each manufacturer published.

ManufacturerReference mass (kg)Source recorded
Runstar
R188TZZ		0.002322026-09-24Request

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) / 23.18 mm
Mean diameter dm(D + d) / 29.53 mm

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

The works that publish R188TZZ.

Runstar

Zhangzhou, Fujian, China

Miniature ball and thrust bearings

Zhangzhou Runshida manufactures miniature and small deep groove ball bearings and flat thrust ball bearings under the Runstar name. Its published company scope gives a bore range of 1–50 mm and includes nonstandard development. Applications span instruments, small motors, appliances, medical equipment and fishing tackle; dimensions and closures still require model-specific confirmation.

Published ranges: Miniature deep groove ball bearings · Small deep groove ball bearings · Flat thrust ball bearings · Nonstandard miniature designs

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

Ask Runstar about R188TZZ

Applications the publishing works state.

ApplicationStated by
Fishing tackleRunstar
Medical equipmentRunstar
Precision instrumentsRunstar
Small motorsRunstar

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 · Limiting speed — grease · Limiting speed — oil · 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 6.35x12.7x4.7625 mm envelope.

DesignationBearing familyWorks
R188-2RSBall bearings1
R188 TBall bearings1
R188 UBall bearings1
R188UZZBall bearings1
R188VBall bearings1
R188VZZBall bearings1
R188ZZBall bearings1
SR188-2RSBall bearings1
SR188 UBall bearings1
SR188UZZBall bearings1
SR188VZZBall bearings1
SR188ZZBall bearings1

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
R1810-2RS7.9375 × 12.7 × 3.9688Thrust1
R1810zz7.938 × 12.7 × 3.967Deep groove ball1
R1810ZZ/2RS7.938 × 12.7 × 3.969Deep groove ball1
R188-2RS6.35 × 12.7 × 4.7625Ball bearings1
R188 T6.35 × 12.7 × 4.7625Ball bearings1
R188 U6.35 × 12.7 × 4.7625Ball bearings1
R188UZZ6.35 × 12.7 × 4.7625Ball bearings1
R188V6.35 × 12.7 × 4.7625Ball bearings1
R188VZZ6.35 × 12.7 × 4.7625Ball bearings1
R188ZZ6.35 × 12.7 × 4.7625Ball bearings1
R188ZZ/2RS6.35 × 12.7 × 3.175Deep groove ball1

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

Request a quote for R188TZZ.

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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