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When shaft deflection, housing misalignment, or mounting errors cause premature bearing failure, the right bearing geometry makes all the difference. Metric self aligning ball bearings are engineered for engineers, maintenance technicians, and equipment builders who need reliable rotation even when shaft and housing axes are not perfectly aligned — tolerating angular misalignment of typically 2°–3°.
This listing covers the full range of metric self aligning ball bearings from series 1018 through 2205, with bore diameters from 7 mm (0.28 in) to 50 mm (1.97 in), outer diameters from 22 mm (0.87 in) to 90 mm (3.54 in), and widths from 7 mm (0.28 in) to 23 mm (0.91 in). The inner ring features a spherical raceway that seats against the outer ring's concave spherical surface, allowing the self-aligning action without generating edge stress.
Typical use cases include conveyor drive shafts where frame flex causes continuous misalignment, agricultural equipment such as seeders and spreaders subject to vibration and debris, and light industrial gearboxes or fan assemblies where precise shaft alignment is difficult to maintain during field installation.
| Bearing Type | Self Aligning Ball Bearing |
|---|---|
| Series | 1018, 1027, 1029, 1201–1210, 1300–1306, 2202–2207 |
| Row Configuration | Single-row (1xxx series) / Double-row (2xxx series) |
| Bore Diameter (d) | 7 mm – 50 mm (0.28 in – 1.97 in) |
| Outer Diameter (D) | 22 mm – 90 mm (0.87 in – 3.54 in) |
| Width (B) | 7 mm – 23 mm (0.28 in – 0.91 in) |
| Angular Misalignment Tolerance | Typically 2°– 3° |
| Dimensional Standard | ISO Metric |
| Cage Type | See variant options |
| Lubrication | See variant options |
| Sealing / Shielding | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Product Type | Ball Bearings |
Match the bore diameter (d) to your shaft diameter, the outer diameter (D) to your housing bore, and the width (B) to your housing depth. All three dimensions must fit within tolerance. Use the size code in the variant name — for example, 1205 – 25×52×15mm means bore 25 mm, OD 52 mm, width 15 mm. If you are replacing an existing bearing, the series number stamped on the old bearing ring is the fastest reference.
The 1xxx series (e.g., 1201, 1205) are single-row self aligning ball bearings with a narrower width, suited for lighter radial loads and compact housings. The 2xxx series (e.g., 2205, 2206) are double-row self aligning ball bearings with a wider body that carries higher radial loads and provides greater shaft support. For the same bore size, the 2xxx series will have a larger width (B) dimension.
Metric self aligning ball bearings typically tolerate angular misalignment of 2° to 3° between the shaft and housing axes. This is sufficient for most conveyor, agricultural, and light industrial applications where shaft deflection or imprecise mounting is expected. Exceeding this range will cause uneven ball loading and accelerated wear — if your application requires greater misalignment tolerance, consider spherical roller bearings instead.
Standard metric self aligning ball bearings use carbon chromium steel rings and balls, which provide moderate corrosion resistance when properly lubricated and sealed. For consistently wet, washdown, or chemically exposed environments, look for variants with stainless steel construction or sealed (2RS) configurations that retain grease and exclude moisture. Contact us to confirm sealing options for your specific size.
Yes, provided the bore (d), outer diameter (D), and width (B) match your existing bearing exactly. Metric self aligning ball bearings follow ISO dimensional standards, so a 1205 bearing from any ISO-compliant source will share the same envelope dimensions: 25×52×15 mm. Always verify the three key dimensions rather than relying solely on the series number, as some manufacturers use non-standard suffixes that indicate modified dimensions.
Open (unshielded) self aligning ball bearings require periodic grease replenishment — typically lithium-based NLGI #2 grease. Re-lubrication intervals depend on operating speed, temperature, and load, but a general guideline for moderate-duty applications is every 500–2,000 operating hours. Pre-greased and sealed (2RS) variants are maintenance-free for their rated service life. Contact us to confirm the lubrication state of your selected size.
Common applications include conveyor belt drive and tail shafts, agricultural equipment (seeders, spreaders, augers), centrifugal fans and blowers, light gearboxes, textile machinery, and general industrial rotating equipment where shaft deflection or housing misalignment is a known design constraint. The smaller sizes (bore 7–15 mm) are also used in power tools and small motors.
