THE BEARINGINDEX DIRECTORY

6307 — 35 × 80 × 21 mm

BOUNDARY DIMENSIONSUNIT / mm

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

Deep groove ball

6307

6307 is a deep groove ball designation documented on BearingIndex from 3 independent manufacturer publications. The published boundary dimensions are 35 × 80 × 21 mm. The designation ends in bore code 07, which resolves to a 35 mm bore under ISO 15 and matches what the manufacturers published. 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: 35 mm
Outside D: 80 mm
Width B: 21 mm

Compare the 3 publications

Manufacturers publish different values for this designation.

B: 21 / 23 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
Sihai 6307	21	—	—	—	—	—	2026-09-24	Request
CZ 6307	23	—	—	—	—	—	2026-09-24	Request
INYOUNG 6307	21	33.4	19.3	8200	10000	0.459	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 21 – 23 mm across 3 sources	3

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	22.5 mm
Mean diameter d_m	(D + d) / 2	57.5 mm
Speed factor d_m · n	mean diameter × highest published limiting speed	575,000 mm·min⁻¹
C / C₀ load ratio	dynamic ÷ static load rating	INYOUNG 1.73

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

The works that publish 6307.

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 6307

INYOUNG

Taizhou, Zhejiang, China

Ball and roller bearings from Wenling

Inyoung Bearing is a bearing manufacturer based in Daxi, Wenling. Its published product categories cover deep groove ball, cylindrical roller, tapered roller, spherical roller and angular contact bearings. The company describes a manufacturing history under its former Taizhou Baoma name; buyers can use the current legal entity to identify the intended supplier.

Published ranges: Deep groove ball bearings · Cylindrical and tapered roller bearings · Spherical roller bearings · Angular contact bearings

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

Ask INYOUNG about 6307

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 6307

Applications the publishing works state.

Application	Stated by
Air compressors	INYOUNG
Automotive systems	Sihai
Brushless motors	CZ
Drones	CZ
Garden tools	CZ
Generators	INYOUNG
Household appliances	Sihai
Motorcycles	INYOUNG
Office equipment	Sihai
Power tools	CZ, Sihai

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 35x80x21 mm envelope.

Designation	Bearing family	Works
21307CA	Spherical roller	1
21307CTN1	Spherical roller	1
30307	Tapered roller	1
6307-2RZ	Deep groove ball	1
6307T1X	Deep groove ball	1
6307ZZ/2RS	Deep groove ball	1
760307-TN	Angular contact	1
S6307ZZ/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
6300	10 × 35 × 11	Deep groove ball	7
6300-2RS	10 × 35 × 11	Deep groove ball	1
6300-2RZ	10 × 35 × 11	Deep groove ball	1
6300E	10 × 35 × 11	Deep groove ball	1
6300ZZ	10 × 35 × 11	Deep groove ball	1
6300ZZ/2RS	10 × 35 × 11	Deep groove ball	1
6301	12 × 37 × 12	Deep groove ball	5
6301-2RZ	12 × 37 × 12	Deep groove ball	1
6301E	12 × 37 × 12	Deep groove ball	1
6301T1X	12 × 37 × 12	Deep groove ball	1
6301ZZ/2RS	12 × 37 × 12	Deep groove ball	1
6302	15 × 42 × 13	Deep groove ball	5
6302-2RZ	15 × 42 × 13	Deep groove ball	1
6302E	15 × 42 × 13	Deep groove ball	1
6302T1X	15 × 42 × 13	Deep groove ball	1
6302ZZ/2RS	15 × 42 × 13	Deep groove ball	1
6303	17 × 47 × 14	Deep groove ball	5
6303-2RZ	17 × 47 × 14	Deep groove ball	1

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

Request a quote for 6307.

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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