THE BEARINGINDEX DIRECTORY

FR3 — 4.762 × 12.7 × 4.978 mm

BOUNDARY DIMENSIONSUNIT / mm

Boundary dimensions · schematic, not a product photograph or manufacturing drawing.

Deep groove ball

FR3

FR3 is a deep groove ball designation documented on BearingIndex from 1 manufacturer publication. The published boundary dimensions are 4.762 × 12.7 × 4.978 mm. 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: 4.762 mm
Outside D: 12.7 mm
Width B: 4.978 mm

Compare the 1 publication

What each manufacturer published.

Manufacturer	Source recorded
Hongchi FR3	2026-09-24	Request

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.

Figure	How it is obtained	Result
Radial section height	(D − d) / 2	3.97 mm
Mean diameter d_m	(D + d) / 2	8.73 mm

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

The works that publish FR3.

Hongchi

Ningbo, Zhejiang, China

Miniature metric, inch and thrust bearings

Ningbo Hongchi manufactures miniature bearings with a published bore range of 1–40 mm. Its product scope includes metric and inch miniature bearings, flanged bearings and flat thrust ball bearings. The company lists miniature motors, cooling fans, drones, instruments and medical equipment among its applications; exact material and closure options should be confirmed per model.

Published ranges: Metric and inch miniature bearings · Flanged miniature bearings · Flat thrust ball bearings

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

Ask Hongchi about FR3

Applications the publishing works state.

Application	Stated by
Cooling fans	Hongchi
Drones	Hongchi
Miniature motors	Hongchi
Precision instruments	Hongchi

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 · Reference mass.

Ask the manufacturer for these when you enquire.

Request a quote for FR3.

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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