ISO 281 6000 Series Deep Groove Ball Bearings Specification
What ISO 281 fixes, what it deliberately leaves to another document, its equivalents, and the dimensional table.
ISO 281 defines the basic dynamic load rating Cr (or Ca for a thrust bearing) and the method for calculating rating life from it. The rating is the constant load a bearing can carry for one million revolutions with 90% reliability; life follows L10 = (C/P)^p, with p = 3 for ball bearings and 10/3 for roller bearings, and the standard also gives the modified rating life that accounts for lubrication cleanliness and fatigue limit.
Standard
ISO 281
Covers
Dynamic load ratings and rating life
Does not fix
It does not fix a bearing's dimensions, and it does not publish the rating for any particular bearing — the rating is declared by the manufacturer, computed to this method from the internal geometry, so two makers' figures for the same 6204 differ by a few percent and are not interchangeable in a life calculation.
Equivalents
GB/T 6391 is the Chinese adoption; the static rating C0 is a separate document, ISO 76.
Product
6000 Series Deep Groove Ball Bearings
Governing standards
ISO 15 / DIN 625-1 / GB/T 276
Equivalence between the ISO, DIN and GB/T documents is dimensional: a bearing made to either mounts in the same seat. It is not an equivalence of load rating, tolerance class or internal clearance, each of which is fixed by a separate standard and declared separately.
ISO 281 covers dynamic load ratings and rating life. This page sets out what the standard fixes for 6000 series deep groove ball bearings, what it deliberately leaves to other documents, its national equivalents, and the dimensional table supplied against it.
ISO 281 — Scope
ISO 281 defines the basic dynamic load rating Cr (or Ca for a thrust bearing) and the method for calculating rating life from it. The rating is the constant load a bearing can carry for one million revolutions with 90% reliability; life follows L10 = (C/P)^p, with p = 3 for ball bearings and 10/3 for roller bearings, and the standard also gives the modified rating life that accounts for lubrication cleanliness and fatigue limit.
What ISO 281 Does Not Fix
It does not fix a bearing's dimensions, and it does not publish the rating for any particular bearing — the rating is declared by the manufacturer, computed to this method from the internal geometry, so two makers' figures for the same 6204 differ by a few percent and are not interchangeable in a life calculation.
This division of labour is the thing to carry away from any bearing standard. A boundary dimension standard makes bearings interchangeable; it does not make them equivalent. Two bearings of the same designation from different makers mount in the same seat and are not required to have the same load rating, the same internal design, the same cage or the same speed limit.
Dimensions Supplied to ISO 281
Designation
Bore d (mm)
Outer diameter D (mm)
Width B (mm)
Chamfer r min (mm)
Basic dynamic load rating Cr (kN)
Basic static load rating C0r (kN)
Limiting speed grease (rpm)
Mass (kg)
6000
10
26
8
0.3
4.75
1.96
20000
0.019
6001
12
28
8
0.3
5.4
2.36
19000
0.021
6002
15
32
9
0.3
5.85
2.85
17000
0.030
6003
17
35
10
0.3
6.05
3.25
15000
0.039
6004
20
42
12
0.6
9.95
5.0
13000
0.069
6005
25
47
12
0.6
11.9
6.55
11000
0.078
6006
30
55
13
1
13.8
8.3
9500
0.116
6007
35
62
14
1
16.8
10.2
8500
0.153
6008
40
68
15
1
17.8
11.6
8000
0.185
6009
45
75
16
1
22.1
14.6
7000
0.235
6010
50
80
16
1
22.9
16.0
6700
0.261
6011
55
90
18
1.1
30.7
21.2
6000
0.393
6012
60
95
18
1.1
30.7
23.2
5600
0.417
6013
65
100
18
1.1
32.5
25.0
5300
0.440
6014
70
110
20
1.1
39.7
31.0
5000
0.616
6015
75
115
20
1.1
41.6
33.5
4500
0.650
6016
80
125
22
1.1
47.5
39.0
4300
0.870
6017
85
130
22
1.1
49.4
41.5
4000
0.910
6018
90
140
24
1.5
60.5
50.0
3800
1.20
6019
95
145
24
1.5
63.7
54.0
3600
1.25
6020
100
150
24
1.5
60.5
54.0
3400
1.30
National Equivalents
GB/T 6391 is the Chinese adoption; the static rating C0 is a separate document, ISO 76.
This product is supplied against ISO 15 / DIN 625-1 / GB/T 276, which names the documents it is made to.
Catalog Products Governed by ISO 281
ISO 281 governs more than this one series. In this catalog it applies to:
Other ways to specify the 6000 Series Deep Groove Ball Bearings
The same part is also governed by ISO 15 and DIN 625, and where two standards cover one dimension they agree — the numbers are the same, the document is not.
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the designation snaps the other fields to that size's standard values; you can then override any individual value.
Sends the selected values to the quote form below.
Our facility
The numbers come off our own machines
Every ring is gauged for bore and outside diameter, every assembly for radial internal clearance to ISO 5753-1, and every finished bearing for vibration. That is why the values on this page are quotable rather than indicative.
Request a Quote
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (ISO 15 / DIN 625-1 / GB/T 276)
Designation
Bore d (mm)
Outer diameter D (mm)
Width B (mm)
Chamfer r min (mm)
Basic dynamic load rating Cr (kN)
Basic static load rating C0r (kN)
Limiting speed grease (rpm)
Mass (kg)
6000
10
26
8
0.3
4.75
1.96
20000
0.019
6001
12
28
8
0.3
5.4
2.36
19000
0.021
6002
15
32
9
0.3
5.85
2.85
17000
0.030
6003
17
35
10
0.3
6.05
3.25
15000
0.039
6004
20
42
12
0.6
9.95
5.0
13000
0.069
6005
25
47
12
0.6
11.9
6.55
11000
0.078
6006
30
55
13
1
13.8
8.3
9500
0.116
6007
35
62
14
1
16.8
10.2
8500
0.153
6008
40
68
15
1
17.8
11.6
8000
0.185
6009
45
75
16
1
22.1
14.6
7000
0.235
6010
50
80
16
1
22.9
16.0
6700
0.261
6011
55
90
18
1.1
30.7
21.2
6000
0.393
6012
60
95
18
1.1
30.7
23.2
5600
0.417
6013
65
100
18
1.1
32.5
25.0
5300
0.440
6014
70
110
20
1.1
39.7
31.0
5000
0.616
6015
75
115
20
1.1
41.6
33.5
4500
0.650
6016
80
125
22
1.1
47.5
39.0
4300
0.870
6017
85
130
22
1.1
49.4
41.5
4000
0.910
6018
90
140
24
1.5
60.5
50.0
3800
1.20
6019
95
145
24
1.5
63.7
54.0
3600
1.25
6020
100
150
24
1.5
60.5
54.0
3400
1.30
Video: ISO 281 6000 Series Deep Groove Ball Bearings Specification
Third-party video, selected automatically for this topic. It is not produced by Bushing Bearings and is not a specification source — use the tables on this page for dimensional data.
Frequently Asked Questions
Can I cite the GB/T number instead of the ISO one?
For the boundary dimensions, yes — the GB/T standards restate the ISO dimension plan and a part made to either mounts in the same seat. The safest drawing note gives both, because it stays legible if the supply moves between a Chinese, a European and an international manufacturer.
What does ISO 281 specify?
ISO 281 defines the basic dynamic load rating Cr (or Ca for a thrust bearing) and the method for calculating rating life from it. The rating is the constant load a bearing can carry for one million revolutions with 90% reliability; life follows L10 = (C/P)^p, with p = 3 for ball bearings and 10/3 for roller bearings, and the standard also gives the modified rating life that accounts for lubrication cleanliness and fatigue limit.
What does ISO 281 not cover?
It does not fix a bearing's dimensions, and it does not publish the rating for any particular bearing — the rating is declared by the manufacturer, computed to this method from the internal geometry, so two makers' figures for the same 6204 differ by a few percent and are not interchangeable in a life calculation.
What is the equivalent of ISO 281?
GB/T 6391 is the Chinese adoption; the static rating C0 is a separate document, ISO 76.
How do I request a quotation?
Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.
Need a bearing quote or a spec sheet?Message our engineers on WhatsApp — send a drawing or DIN number and get pricing back fast.Start WhatsApp Chat →
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