21308 EK Spherical Roller Bearings, Stamped Steel Cages, Tapered Bore

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21308 EK

Bore Diameter:40 mm

Outside Diameter:90 mm

Width:23 mm

Weight:0.75 kg

Min. Order:1 Piece

The 21308 EK Double-row spherical roller bearings are suitable for heavy-load, impact, and eccentric conditions. Classic applications include vibrating screen exciters, crushers, fans, paper machine press rolls, mining conveyor equipment, and marine propulsion shafts.

The 21308 EK bearing is a Spherical roller bearings, double row with an inner diameter of 40 mm , an outer diameter of 90 mm, a width of 23 mm. High-carbon chromium steel rings, High-carbon chromium steel rolling mlement. Its dynamic radial rated load is approximately 106931 N, its static radial rated load is approximately 107777 N. It uses Normal standard radial clearance, open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.

Dimensions:

Inside Diameter:

40 mm

Outside Diameter:

90 mm

Thickness:

23 mm

Weight:

0.75 KG

Performance Data:

Dynamic load Capacity, Radial (Cr):

106931 N

Static load Capacity, Radial (Cor):

107777 N

Reference speed (Grease rpm):

6961

Limiting speed (Oil rpm):

9482

Specifications:

Old Designations:

21308EK

Structure:

Spherical Roller Bearings

Number of Rows:

Radial Clearance Trade No.:

Normal

Bearing Material:

High-carbon chromium steel

Cage Type:

stamped steel cages

Seals Type:

open

Rolling Mlement Material:

High-carbon chromium steel

Bore Type:

K = Tapered bore, taper 1:12

Operating Temperature:

-30 to +200 °C

System of Measurement:

Metric

Series:

213..-EK

Rolling Element:

spherical rollers

Transaction Information:

Transport Package:

Standard Export Package

Service:

7*24 hour

Shipping Ways:

by Sea or Air

Country of Origin:

china

Stock:

200 Piece

Port:

Tianjin, Shanghai, Shenzhen, Guangzhou or Qingdao

Payment term:

by T/T in advance

Delivery time:

2-3 days for stock, 25-30 days for bulk production

Detailed description

21308 EK bearings ( 40 mm x 90 mm x 23 mm) have the advantages of Self-aligning, high load-bearing capacity, impact resistant, and adaptable to heavy loads, and are therefore widely used in the Gearboxes, drive shafts, conveying equipment, general machinery.

Part Number	21308 EK
Manufacturer Part Code	21308EK
Internal design	E = Optimized internal design for increased load carrying capacity, Flangeless inner ring and two stamped steel cages Annular groove and three lubrication holes in the outer ring, Guide ring centred on the inner ring
Bearing Type	Spherical roller bearings, double row
m Weight [lb]	1.653
Seal type	open
Series	213..-EK
Cage	stamped steel cages
Bore Type	K = Tapered bore, taper 1:12
Radial internal clearance	Normal
Units	Metric
C_r Dynamic Radial [lbf]	24038
C_0r Static Radial [lbf]	24228
P_u Fatigue Radial [lbf]	2636
Operating temperature - T(min) [°C]	-30
Operating temperature - T(max) [°C]	+200
n_B Speed ratings (grease) [rpm]	6961
n_G Speed ratings (oil) [rpm]	9482
Heat stabilization	392 °F (200 °C)
Dimension
d φ Inside [inch]	1.575
D Φ Outside [inch]	3.543
B Width [inch]	0.906
b [inch]	0.217
K [inch]	0.118
d₂ [inch]	2.362
D₁ [inch]	3.142
r_a(max.) Fillet [inch]	0.059
r₁,r₂(min.) Fillet [inch]	0.059
Angular misalignment	1 degree
Abutment dimensions
d_a(min.) [inch]	1.929
D_a(max.) [inch]	3.189
Calculation factor
e	0.24
Y₁	2.8
Y₂	4.2
Y₀	2.8

The 21308 EK Double-row spherical roller bearings mainly consist of an inner ring, an outer ring, two rows of spherical rollers, a cage, and seals. The outer ring raceway has a spherical structure, while the inner ring has a double-row raceway. The rollers and raceways are logarithmically curved. The cage is typically made of stamped steel or machined brass.

Double-row spherical roller bearings possess excellent self-aligning properties, compensating for shaft deflection, installation errors, and misalignment. They can simultaneously withstand radial loads and bidirectional axial loads, exhibiting extremely high load-bearing capacity and strong impact resistance. Furthermore, the internal clearance can be optimized for vibration conditions, effectively reducing frictional temperature rise.

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21308 EK Spherical Roller Bearings, Stamped Steel Cages, Tapered Bore

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