BearingIndex
THE BEARINGINDEX DIRECTORY

604 — 4 × 12 × 4 mm

BOUNDARY DIMENSIONSUNIT / mm
B = 4 mmD = 12 mmd = 4 mm
Boundary dimensions · schematic, not a product photograph or manufacturing drawing.
Deep groove ball

604

604 is a deep groove ball designation documented on BearingIndex from 8 independent manufacturer publications. The published boundary dimensions are 4 × 12 × 4 mm. The publishing works are in Zhejiang, Fujian provinces, China. Every value below comes from that manufacturer’s own published material, with the date it was recorded.

Bore d
4 mm
Outside D
12 mm
Width B
4 mm

Compare the 8 publications

What each manufacturer published.

ManufacturerDynamic load rating (kN)Static load rating (kN)Limiting speed — grease (rpm)Limiting speed — oil (rpm)Minimum corner radius (mm)Ball count (pcs)Ball diameter (mm)Reference mass (kg)Source recorded
Sihai
604
————————2026-09-24Request
CZ
604
————————2026-09-24Request
SILL
604
————————2026-09-24Request
Runstar
604
————————2026-09-24Request
Yuyao Global
604
————————2026-09-24Request
RCL
604
0.7160.2824800056000———0.00232026-09-24Request
NBKJ-B
604
0.970.364300051000—81.5880.0022026-09-24Request
Yuyao Xinfeng
604
0.970.36——0.272—2026-09-24Request

A dash means that manufacturer did not publish the value. Dimensions every source agrees on are shown above rather than repeated per row.

Where the sources agree.

PropertyFindingSources
Dynamic load ratingRanges 0.716 – 0.97 kN across 3 sources3
Static load ratingRanges 0.282 – 0.36 kN across 3 sources3
Limiting speed — greaseRanges 43000 – 48000 rpm across 2 sources2
Limiting speed — oilRanges 51000 – 56000 rpm across 2 sources2
Ball countRanges 7 – 8 pcs across 2 sources2
Ball diameterRanges 1.588 – 2 mm across 2 sources2
Reference massRanges 0.002 – 0.0023 kg across 2 sources2

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

Calculated from the published values.

FigureHow it is obtainedResult
Radial section height(D − d) / 24 mm
Mean diameter dm(D + d) / 28 mm
Speed factor dm · nmean diameter × highest published limiting speed448,000 mm·min−1
C / C₀ load ratio (3 sources)dynamic ÷ static load ratingRCL 2.54 · NBKJ-B 2.69 · Yuyao Xinfeng 2.69

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

The works that publish 604.

CZ

Ningbo, Zhejiang, China

Miniature motor bearings and inch series

Cixi Lisheng manufactures miniature and small motor bearings under the CZ brand. Its catalogue includes metric 60, 62, 68, 69 and 16000 series, inch R series, stainless steel and nonstandard products. The company identifies brushless motors, power tools, garden tools and drones as applications. Confirm the exact model and operating requirements before specifying.

Published ranges: Metric miniature motor bearings · Inch R-series bearings · Stainless steel bearings · Nonstandard bearing designs

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

Ask CZ about 604

NBKJ-B

Ningbo, Zhejiang, China

Small deep groove and coated bearing designs

Ningbo Kejie manufactures miniature and small deep groove ball bearings under the NBKJ-B name. Its catalogue includes 6000, 6200, 6300, 6700, 6800, 6900 and R series, plus coated and insert-bearing ranges. The company describes custom nonstandard development for appliances, small motors, power tools and other transmission equipment.

Published ranges: Metric deep groove ball-bearing series · Inch R-series bearings · Coated bearing designs · Insert-bearing products

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

Ask NBKJ-B about 604

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 604

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 604

Sihai

Ningbo, Zhejiang, China

Deep groove bearings for motors and automotive use

Cixi Sihai develops and manufactures deep groove ball bearings. Its published scope gives a bore range of 6–35 mm and lists 6000, 6200, 6300, 6800 and 6900 series. Applications include vehicles, appliances, power tools, instruments and office equipment. Automotive engine-related references should be matched to the exact assembly.

Published ranges: 6000, 6200 and 6300 series · 6800 and 6900 series · Automotive engine-bearing applications

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

Ask Sihai about 604

SILL

Ningbo, Zhejiang, China

Deep groove and tapered roller bearings

Ningbo Saihe designs and manufactures deep groove ball bearings, tapered roller bearings and nonstandard designs under the SILL name. Its company introduction identifies GCr15 bearing steel as a production material and lists 6000, 6200 and 6300 series. This is a manufacturer-published material statement; a batch-specific material report should be requested when required.

Published ranges: 6000, 6200 and 6300 deep groove series · Tapered roller bearings · Nonstandard bearing designs

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

Ask SILL about 604

Yuyao Global

Ningbo, Zhejiang, China

Miniature and small bearings

Yuyao Global manufactures miniature and small bearings. Its published product organization includes rubber-sealed and metal-shielded designs, with applications in appliances, automotive systems, communications equipment and medical devices. The company describes manufacturing and inspection operations in Yuyao; closure type and lubrication should be agreed for the operating environment.

Published ranges: Miniature and small bearings · Rubber-sealed bearing designs · Metal-shielded bearing designs

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

Ask Yuyao Global about 604

Yuyao Xinfeng

Ningbo, Zhejiang, China

Small ball bearings and custom assemblies

Yuyao Xinfeng manufactures miniature and small bearings in metric and inch dimensions. Its published range includes single- and double-row deep groove bearings, steering-system bearings, full-complement ball bearings, bicycle bearings and thin-ring designs. Nonstandard plastic-bearing combinations are also described. Buyers should identify the complete assembly configuration and mating parts.

Published ranges: Single- and double-row deep groove ball bearings · Metric and inch miniature bearings · Steering and bicycle-bearing designs · Thin-ring and nonstandard assemblies

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

Ask Yuyao Xinfeng about 604

Applications the publishing works state.

ApplicationStated by
Automotive steeringYuyao Xinfeng
Automotive systemsSihai, Yuyao Global
BicyclesRCL, Yuyao Xinfeng
Brushless motorsCZ
Circular loomsRCL
Communications equipmentYuyao Global
DronesCZ
Encoders and motorsRCL
Fishing tackleRunstar
Garden toolsCZ
Household appliancesNBKJ-B, Sihai, Yuyao Global
Medical equipmentRunstar, Yuyao Global
Office equipmentSihai
Power toolsCZ, NBKJ-B, Sihai
Precision instrumentsRunstar
RoboticsRCL
Small motorsNBKJ-B, Runstar
Transmission equipmentNBKJ-B

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.

Ask the manufacturer for these when you enquire.

Other designations with the same 4x12x4 mm envelope.

DesignationBearing familyWorks
604 ZZDeep groove ball1
604ZZ/2RSDeep groove ball1
F604ZZ/2RSDeep groove ball1
S604Deep groove ball1
S604-2RSDeep groove ball1
S604ZZDeep groove ball1
S604ZZ/2RSDeep groove ball1
SF604ZZ/2RSDeep groove ball1

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
600010 × 26 × 8Deep groove ball12
6000-2RS10 × 26 × 8Deep groove ball1
6000E10 × 26 × 8Deep groove ball1
6000T1X10 × 26 × 8Deep groove ball1
6000TB10 × 26 × 8Deep groove ball1
6000ZZ10 × 26 × 10Deep groove ball2
6000ZZ/2RS10 × 26 × 8Deep groove ball1
600112 × 28 × 8Deep groove ball9
6001-2RS12 × 28 × 8Deep groove ball1
6001-2RZ12 × 28 × 8Deep groove ball1
6001E12 × 28 × 8Deep groove ball1
6001G12 × 28 × 8Deep groove ball1
6001T1X12 × 28 × 8Deep groove ball1
6001TB12 × 28 × 8Deep groove ball1
6001ZZ12 × 28 × 8Deep groove ball2
6001ZZ/2RS12 × 28 × 8Deep groove ball1
600215 × 32 × 9Deep groove ball10
6002-2RZ15 × 32 × 9Deep groove ball1

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

Request a quote for 604.

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 →