13944 Self-Aligning Ball Bearing (220x300x60mm)

How to read this designation →

d — BoreD — Outside DiameterB — Width

Bearing dimensions and basic technical information.

Illustration coming soon

Bore diameter (d)220 mm

Outer diameter (D)300 mm

Width (B)60 mm

TypeSelf-Aligning Ball Bearing

RowDouble Row

ClearanceCN

Cage

Material Steel

Cage materials — Self-Aligning Ball Bearing

Suffix	Material	Printed by
`(none)`	Pressed steel	NSK, NTN
`TN9 / TVH`	Polyamide (glass-fibre reinforced PA66)	SKF, Schaeffler (FAG)
`M`	Machined brass	Schaeffler (FAG)

Suffix letters are set by each manufacturer; the third column names the brands that print the row. Always confirm the exact variant in the manufacturer's table.

Clearance groups

Group	Meaning
`C2`	Radial internal clearance smaller than normal
`CN`	Normal clearance — the ISO default group, usually not printed in the designation (SKF/FAG may write it as CN or C0)
`C3`	Radial internal clearance greater than normal
`C4`	Greater than C3

CN is the ISO normal clearance group and is usually not printed in the designation; other groups include C2, C3 and C4. The numeric ranges are defined per bearing type and size (ISO 5753), so always compare them in the manufacturer's table.

Bearing materials

Material	Where it appears
Bearing steel	Rings and rolling elements — the standard for every model without a special material note
Stainless steel	Corrosion-resistant versions, e.g. the SKF "W" series
Ceramic rolling elements (hybrid)	Ceramic balls or rollers running in steel rings; electrically insulating and tolerant of poor lubrication
Ceramic-coated steel rings	SKF INSOCOAT: VL0241 coats the outer ring, VL2071 the inner ring (electrical insulation against stray currents)

The material refers to the rings and the rolling elements. Unless a special material is stated, both are bearing steel.

Manufacturer Ratings

Load-rating symbols are printed as each manufacturer writes them in its own catalogue, so the same quantity can carry a different symbol from brand to brand.

Brand	Dynamic Load Rating	Static Load Rating	Fatigue Load Limit
SKF 13944	C60.5 kN	C030.5 kN	Pu0.97 kN

Speed Ratings

Speed limits depend on sealing and lubrication, and definitions differ by manufacturer. Contact-sealed variants are normally greased for life and run slower. Always confirm the exact variant in the manufacturer's table.

Brand	Grease open / shielded	Oil open	Reference	Limiting
SKF 13944	—	—	3,800 r/min	2,400 r/min

References

SKF — SKF Group, Rolling Bearings, PUB BU/P1 17000/1 EN, Oct. 2018.

About This Type

Self-aligning ball bearings have two rows of balls running in a spherical outer-ring raceway, so the bearing accommodates shaft misalignment and housing deflection without edge loading. They carry moderate radial loads and light axial loads in both directions. Typical applications include agricultural and textile machinery, conveyors, fans and blowers, and woodworking machines — arrangements where perfect alignment cannot be held.

This type is the low-friction, high-speed choice when misalignment is expected but loads stay moderate; for heavy loads a spherical roller bearing is the stronger alternative. The CN/C2/C3 clearance groups apply, with C3 common where fits are tight or temperatures run high. Most sizes are available with a cylindrical bore or a tapered bore (suffix K) for adapter-sleeve mounting, and many come open or with integral contact seals.

Tapered-bore versions are mounted on adapter or withdrawal sleeves with the drive-up method, measuring the clearance reduction rather than relying on nut torque; the spherical raceway accommodates residual misalignment but not an over-tightened sleeve, which removes the internal clearance. Sealed variants are greased for life and need no relubrication.

Series note: The 13 series is the medium design, with higher load ratings than the 12 series for the same bore.

Related Guides

Disclaimer: Data on this page is compiled from publicly available online sources for reference only, and not every model appears in a manufacturer's published catalog. Values may differ between sources and editions — always verify against the manufacturer's current documentation before design or purchase.Full disclaimer →