THE BEARINGINDEX DIRECTORY

MR137 — 7 × 13 × 3 mm

BOUNDARY DIMENSIONSUNIT / mm

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

Deep groove ball

MR137

MR137 is a deep groove ball designation documented on BearingIndex from 2 independent manufacturer publications. The published boundary dimensions are 7 × 13 × 3 mm. The publishing works are in Zhejiang, Shanghai provinces, China. Every value below comes from that manufacturer’s own published material, with the date it was recorded.

Bore d: 7 mm
Outside D: 13 mm
Width B: 3 mm

Compare the 2 publications

Manufacturers publish different values for this designation.

B: 3 / 4 mm. Confirm the dimension against the specific manufacturer drawing before specifying.

What each manufacturer published.

Manufacturer	Width (mm)	Dynamic load rating (kN)	Static load rating (kN)	Limiting speed — grease (rpm)	Limiting speed — oil (rpm)	Reference mass (kg)	Source recorded
SFH MR137	3	—	—	—	—	—	2026-09-24	Request
RCL MR137	4	0.77	0.338	40000	48000	0.002	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.

Where the sources agree.

Property	Finding	Sources
Width	Ranges 3 – 4 mm across 2 sources	2

Where the figures differ, use the drawing from the manufacturer you buy from.

Calculated from the published values.

Figure	How it is obtained	Result
Radial section height	(D − d) / 2	3 mm
Mean diameter d_m	(D + d) / 2	10 mm
Speed factor d_m · n	mean diameter × highest published limiting speed	480,000 mm·min⁻¹
C / C₀ load ratio	dynamic ÷ static load rating	RCL 2.28

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

The works that publish MR137.

RCL

Ningbo, Zhejiang, China

Thin-wall ball bearings for compact mechanisms

Ningbo Shilong manufactures high-precision bearings under the RCL name. Its published catalogue includes 67, 68, 69 and 60 series, with an emphasis on thin-wall bearings for compact mechanisms. Application pages identify encoders, motors, robots, bicycles and circular looms. Space envelope and rotational requirements are useful starting points for a technical inquiry.

Published ranges: 67- and 68-series thin-wall bearings · 69-series ball bearings · 60-series ball bearings

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

Ask RCL about MR137

SFH

Shanghai, China

Miniature and thin-section ball bearings

Shanghai Hengan manufactures miniature bearings under the SFH brand, with a factory in Wuxi and technical and inspection functions in Shanghai. Its catalogue covers metric, inch and flanged deep groove bearings, thin-section designs, double-row angular contact bearings and thrust bearings. Special nonstandard designs are also listed.

Published ranges: Metric and inch miniature deep groove bearings · Flanged miniature bearings · Thin-section ball bearings · Double-row angular contact and thrust bearings

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

Ask SFH about MR137

Applications the publishing works state.

Application	Stated by
Bicycles	RCL
Circular looms	RCL
Encoders and motors	RCL
Precision machinery	SFH
Precision motors	SFH
Robotics	RCL

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 · 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 7x13x3 mm envelope.

Designation	Bearing family	Works
MR137ZZ/2RS	Deep groove ball	1
SMR137ZZ/2RS	Deep groove ball	1

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

Neighbouring designations documented here.

Designation	Envelope d × D × B (mm)	Bearing family	Works
MR137zz	7 × 13 × 4	Deep groove ball	1
MR137ZZ/2RS	7 × 13 × 3	Deep groove ball	1

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

Request a quote for MR137.

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

Open your enquiry How sourcing works here →

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

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