NTN 21308CD1C3 Spherical Roller Bearing - 40 mm

SKU: NTN 21308CD1C3


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NTN 21308CD1C3

• Specification: Standard
• Standard Size: Metric Series
• Load Direction: Radial
• Raceway Ring Shape: Self-Aligning Roller
• Number Of Raceway Ring Rows: Double Row


Raceway Ring Shape Self-aligning roller Load Direction Radial
I.D. d(Ø) 40 O.D. D(Ø) 90
Width B(mm) 23 Inner/Outer Ring Material Steel
Number Of Raceway Ring Rows Double Row Standard Size Metric System
Specifications/Environment Standard Rolling Element Material Steel
Outer Ring Type Flat Retainer Type Punching
Basic Load Rating, Dynamic Rating(N) 88000 Bearing Ring With Oil Hole, Oil Groove
Internal Clearance Symbol C3 Shaft Bore Config. Cylindrical Bore
Type of momi removing - Symbol of Bearing Ring Shape -
Revolution Frequency(rpm) 4900 Series C Shape
JAN Code - Ordering Code -
Mass(g) - RoHS 10

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.