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Misaligned shafts and vibrating assemblies put enormous stress on standard bearings, leading to premature failure and costly downtime. Whether you're a hobbyist rebuilding a motor, a maker fabricating a custom conveyor, or a technician maintaining light industrial equipment, the 1200–1203 series self-aligning ball bearings are engineered to compensate for shaft misalignment and absorb radial loads without binding.
This listing covers four standard bearing numbers — 1200, 1201, 1202, and 1203 — each featuring a double-row ball design with a spherical outer raceway that allows angular misalignment of typically 2°–3°. Inner diameters range from 10 mm (0.394 in) to 17 mm (0.669 in), outer diameters from 30 mm (1.181 in) to 40 mm (1.575 in), and widths from 9 mm (0.354 in) to 12 mm (0.472 in). Constructed from chrome steel (GCr15) with a precision-ground raceway for consistent load distribution.
Typical applications include small electric motor shafts where slight angular deviation is unavoidable, DIY belt-driven conveyor systems requiring radial load support, agricultural equipment spindles subject to vibration, and light-duty gearbox assemblies in maker and workshop projects. Long-tail use cases: self-aligning bearing for electric motor rebuild, 1200 series radial ball bearing for conveyor shaft, double-row ball bearing for DIY gearbox.
| Bearing Series | 1200 / 1201 / 1202 / 1203 |
|---|---|
| Type | Double-Row Self-Aligning Ball Bearing |
| Inner Diameter (ID) | 10 mm / 12 mm / 15 mm / 17 mm |
| Outer Diameter (OD) | 30 mm / 32 mm / 35 mm / 40 mm |
| Width (Thickness) | 9 mm / 10 mm / 11 mm / 12 mm |
| Material | Chrome Steel (GCr15) |
| Raceway Hardness | Typically HRC 60–64 |
| Angular Misalignment | Typically 2°–3° |
| Row Configuration | Double Row |
| Standard | ISO 15 / DIN 630 |
| Lubrication | See variant options |
| Cage Material | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C0) | See variant options |
| Weight | See variant options |
Select based on your shaft's inner diameter (bore): 1200 fits a 10 mm shaft, 1201 fits 12 mm, 1202 fits 15 mm, and 1203 fits 17 mm. Also confirm the outer diameter and width match your housing before ordering. Use the variant selector above to pick your size.
These are designed primarily for radial loads with moderate axial (thrust) loads. The double-row ball configuration increases radial load capacity compared to single-row designs. They are not recommended for heavy axial-only applications — for those, consider thrust bearings instead.
The spherical outer raceway allows angular misalignment of typically 2°–3° relative to the shaft axis. This makes them well-suited for applications where shaft deflection, housing bore misalignment, or mounting imprecision is unavoidable.
Standard chrome steel (GCr15) bearings offer moderate corrosion resistance suitable for dry or lightly oiled indoor environments. For wet, humid, or chemically exposed environments, consider stainless steel bearings or apply appropriate grease/sealant. Contact us to confirm if a sealed or stainless variant is available for your application.
Yes. All four sizes conform to ISO 15 / DIN 630 dimensional standards, so standard bearing pullers, press-fit tools, and induction heaters sized for the respective bore and OD will work correctly. Always press on the inner ring when installing onto a shaft, and on the outer ring when pressing into a housing.
Yes — these are a common choice for small electric motor rebuilds, belt-driven conveyor shafts, and light-duty gearbox assemblies. The self-aligning feature is especially valuable in motors where the shaft may flex slightly under load or where housing alignment is imperfect.
Open (unshielded) variants should be packed with appropriate bearing grease before installation. If your bearing arrives pre-greased or shielded, it is ready to install. Check the variant description or contact us to confirm the lubrication state of your specific size.
