Self-Aligning Ball Bearings · ISO 15 / GB/T 281 / DIN 630
Machined Brass Cage 1200 Series Self-Aligning Ball Bearings
Temperature and speed limits, lubricant compatibility, and the bore range this cage is offered across.
Machined Brass Cage 1200 Series Self-Aligning Ball Bearings are made from machined cast or wrought brass, rolling-element or ring guided (suffix M, MA, MB or MP by maker). Corrosion behavior: good in most industrial environments; brass is attacked by ammonia, so it is not used in ammonia refrigeration plant. The material is non-magnetic, and the usable service range is the cage itself is good well past the temperature at which the lubricant and the ring stabilization give out. In practice this material is specified for large bearings, high speed, heavy shock and vibration, and wherever temperature or lubricant rules out polyamide.
Material
machined cast or wrought brass, rolling-element or ring guided (suffix M, MA, MB or MP by maker)
Corrosion resistance
Good in most industrial environments; brass is attacked by ammonia, so it is not used in ammonia refrigeration plant
Magnetic response
Non-magnetic
Service temperature
the cage itself is good well past the temperature at which the lubricant and the ring stabilization give out
Property figures are typical for the material. In an assembled bearing the lubricant, the seals and the cage frequently reach their limits before the material does, so check all four against the duty. Material certification is available on request for production orders.
Machined Brass Cage 1200 Series Self-Aligning Ball Bearings are dimensioned to ISO 15 / GB/T 281 / DIN 630 exactly as the standard version is: the material changes the properties, never the envelope. What it does change — good in most industrial environments; brass is attacked by ammonia, so it is not used in ammonia refrigeration plant, non-magnetic and the service range the cage itself is good well past the temperature at which the lubricant and the ring stabilization give out — is set out below with the full size chart.
Why Machined Brass Cage for 1200 Series Self-Aligning Ball Bearings
Specified for large bearings, high speed, heavy shock and vibration, and wherever temperature or lubricant rules out polyamide. In a 1200 series self-aligning ball bearings it is the cage, which spaces the rolling elements and keeps them from touching each other.
A machined brass cage is strong, stable at temperature, and unaffected by the oils and additives that age a polymer cage. It is what large bearings, high-speed bearings and heavily shocked bearings are supplied with.
Material Properties
Grade designation
machined cast or wrought brass, rolling-element or ring guided (suffix M, MA, MB or MP by maker)
Magnetic response
Non-magnetic
Service temperature
The cage itself is good well past the temperature at which the lubricant and the ring stabilization give out
Corrosion characteristic
Good in most industrial environments; brass is attacked by ammonia, so it is not used in ammonia refrigeration plant
Service Limits
Brass is attacked by ammonia, so a brass-caged bearing has no place in an ammonia refrigeration plant. The machined cage also weighs more than a pressed or moulded one, which matters for acceleration and for the cage forces at very high speed.
Alternatives and When to Switch
Polyamide is lighter, quieter and cheaper for ordinary speeds and temperatures; pressed steel is the volume standard. Brass earns its cost where the cage forces or the temperature are genuinely beyond both.
Fitting a Steel Bearing in an Aluminum Housing
Aluminum has roughly twice the coefficient of thermal expansion of bearing steel, so a housing bore machined to a normal H7 fit at room temperature grows away from the outer ring as the machine reaches operating temperature. The outer ring then turns in its seat and wears the bore. Where the housing is aluminum and the temperature rise is more than about 30 degrees C, tighten the housing fit by one grade — J7 or K7 in place of H7 — or fit a steel sleeve into the aluminum. Check the resulting internal clearance: a tighter housing fit takes clearance out of the bearing, which is often why C3 is specified alongside it.
Sizes of 1200 Series Self-Aligning Ball Bearings Available in Machined Brass Cage
Designation
Bore d (mm)
Outer diameter D (mm)
Width B (mm)
Chamfer r min (mm)
Permissible misalignment (deg)
1200
10
30
9
0.6
2.5
1201
12
32
10
0.6
2.5
1202
15
35
11
0.6
2.5
1203
17
40
12
0.6
2.5
1204
20
47
14
1
2.5
1205
25
52
15
1
2.5
1206
30
62
16
1
2.5
1207
35
72
17
1.1
2.5
1208
40
80
18
1.1
2.5
1209
45
85
19
1.1
2.5
1210
50
90
20
1.1
2.5
1211
55
100
21
1.5
2.5
1212
60
110
22
1.5
2.5
1213
65
120
23
1.5
2.5
1214
70
125
24
1.5
2.5
1215
75
130
25
1.5
2.5
1216
80
140
26
2
2.5
1217
85
150
28
2
2.5
1218
90
160
30
2
2.5
1219
95
170
32
2.1
2.5
1220
100
180
34
2.1
2.5
Other ways to specify the 1200 Series Self-Aligning Ball Bearings
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
Held in production, not just on paper
The tolerances above are decided on the grinding and superfinishing lines in our own plant, and gauged on every ring rather than on a sample. A dimension is only worth quoting if it survives the process that produces it.
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 / GB/T 281 / DIN 630)
Designation
Bore d (mm)
Outer diameter D (mm)
Width B (mm)
Chamfer r min (mm)
Permissible misalignment (deg)
1200
10
30
9
0.6
2.5
1201
12
32
10
0.6
2.5
1202
15
35
11
0.6
2.5
1203
17
40
12
0.6
2.5
1204
20
47
14
1
2.5
1205
25
52
15
1
2.5
1206
30
62
16
1
2.5
1207
35
72
17
1.1
2.5
1208
40
80
18
1.1
2.5
1209
45
85
19
1.1
2.5
1210
50
90
20
1.1
2.5
1211
55
100
21
1.5
2.5
1212
60
110
22
1.5
2.5
1213
65
120
23
1.5
2.5
1214
70
125
24
1.5
2.5
1215
75
130
25
1.5
2.5
1216
80
140
26
2
2.5
1217
85
150
28
2
2.5
1218
90
160
30
2
2.5
1219
95
170
32
2.1
2.5
1220
100
180
34
2.1
2.5
Video: Machined Brass Cage 1200 Series Self-Aligning Ball Bearings
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
What corrosion resistance does Machined Brass Cage give?
Corrosion behavior: good in most industrial environments; brass is attacked by ammonia, so it is not used in ammonia refrigeration plant.
Why is Machined Brass Cage used for this part?
A machined brass cage is strong, stable at temperature, and unaffected by the oils and additives that age a polymer cage. It is what large bearings, high-speed bearings and heavily shocked bearings are supplied with.
What are the limits of Machined Brass Cage?
Brass is attacked by ammonia, so a brass-caged bearing has no place in an ammonia refrigeration plant. The machined cage also weighs more than a pressed or moulded one, which matters for acceleration and for the cage forces at very high speed.
What should I use instead of Machined Brass Cage?
Polyamide is lighter, quieter and cheaper for ordinary speeds and temperatures; pressed steel is the volume standard. Brass earns its cost where the cage forces or the temperature are genuinely beyond both.
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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