NTN 21312D1 Spherical Roller Bearing D= 60mm
A roller bearing with an inner ring featuring a two-row raceway groove, an outer ring featuring a spherical raceway surface, and barrel-shaped rolling elements.
· The center of the outer ring raceway surface coincides with the centerline of the bearing. Self-aligning.
· Can even be used when inner ring and outer ring tilting exists due to shaft deflection or housing mounting errors.
· Used for locations where shaft and housing alignment is difficult.
· Shafts which deflect easily such as drive shafts.
· When there are large axial loads.
· Steel equipment, papermaking machinery, mining machinery, etc.
· Ideal for bearing radial load, axial load in 2 directions, and combined radial and axial loads.
|Raceway Ring Shape
|Inner Dia. d(Ø)
||Outer Dia. D(Ø)
||Inner/Outer Ring Material
|Number of Raceway Ring Rows
||Rolling Element Material
|Outer Ring Type
|Basic Load Rating: Dynamic Load(N)
||With Oil Hole, Oil Groove
|Internal Clearance Symbol
||Shaft Bore Config.
|Type of momi removing
||Symbol of Bearing Ring Shape
1. Design features and characteristics
Spherical roller bearings consist of an outer ring having a continuous spherical raceway and two rows of barrel-shaped rollers guided by an inner ring with two raceways. (Refer to Fig. 1) This bearing has self-aligning properties, and therefore is suited for use where misalignment between the inner and outer rings occurs from housing installation error or shaft bending.
Spherical roller bearings have a large capacity for radial loads, axial loads in either direction, and combined loads. They are also suited for applications where vibration and shock loads are encountered. When spherical roller bearings are used with a vertical shaft or under a large axial load, the load on the rollers of the row that is not subject to the axial load becomes small, and the resulting skidding on the rollers may result in wear. If the ratio of the axial load to the radial load exceeds the factor e in the dimension table (Fa/Fr > e), consult NTN Engineering.
In addition to spherical roller bearings with cylindrical bores, spherical roller bearings with tapered bores are also available. Bearings with tapered bores are specified by the suffix “K” at the end of the spherical roller bearing part number. The standard taper ratio is 1:12 for bearings with a “K” suffix; for bearings in series 240 and 241, the suffix “K30” indicates the taper ratio for a bearing is 1:30. Most tapered bore bearings incorporate the use of adapters and withdrawal sleeves for shaft mounting.
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