21308-E1-K-C4 Double Row Spherical Roller Bearings

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21308-E1-K-C4

Bore Diameter:40 mm

Outside Diameter:90 mm

Width:23 mm

Weight:0.702 kg

Min. Order:1 Piece

The 21308-E1-K-C4 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-E1-K-C4 bearing is a Double row spherical roller bearings with an inner diameter of 40 mm , an outer diameter of 90 mm, a width of 23 mm. GCr15, GCr15SiMn, SUJ2 rings, GCr15, SUJ2 rolling mlement. Its dynamic radial rated load is approximately 108936 N, its static radial rated load is approximately 106920 N. It uses C4 standard radial clearance, 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:

0.702 KG

Performance Data:

Dynamic load Capacity, Radial (Cr):

108936

Static load Capacity, Radial (Cor):

106920

Fatigue Load Limit, Radial:

14211

Reference speed (Grease rpm):

5192

Limiting speed (Oil rpm):

9491

Specifications:

Structure:

Spherical Roller Bearings

Number of Rows:

Radial Clearance Trade No.:

Bearing Material:

GCr15, GCr15SiMn, SUJ2

Cage Type:

JPA = Stamping steel cage

Rolling Mlement Material:

GCr15, SUJ2

Bore Type:

K = Tapered bore (K = taper 1:12)

System of Measurement:

Metric

Series:

213..-E1-XL-K-C4

Rolling Element:

symmetrical rollers

Transaction Information:

Transport Package:

Standard Export Package

Service:

7*24 hour

Shipping Ways:

by Sea or Air

Country of Origin:

china

Stock:

10 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-E1-K-C4 bearings 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-E1-K-C4
Design Type	E1 = without central rip
Bore Type	K = Tapered bore (K = taper 1:12)
RIC	C4
X-Life	XL long life design
Row	2
Bearing Type	Double row spherical roller bearings
Manufacturer Part Code	21308-E1-K-C4
Original Code	21308-E1-K
Cage	JPA = Stamping steel cage
Measurement	Metric
d φ Inside [inch]	1.575
D Φ Outside [inch]	3.543
B Width [inch]	0.906
n_B Reference speed (grease) [min^–1]	5192
n_G Limiting speed (oil) [min^–1]	9491
Weight [kg]	0.702
r(min.) Chamfer [inch]	0.059
D₁ [inch]	3.181
d₂ [inch]	2.350
d_s [inch]	0.126
n_s [inch]	0.189
C_r Radial Dynamic [lbf]	24488
C_0r Radial static [lbf]	24035
C_ur Radial Fatigue [lbf]	3194
Temperature - T(min)[°C]	-30
Temperature - T(max)[°C]	up +200
Mounting dimensions
d_a(min.) [inch]	1.929
D_a(max.) [inch]	3.189
r_a(max.) [mm]	0.702
Calculation coefficient
e	0.24
Y₀	2.75
Y₁	2.81
Y₂	4.19

The 21308-E1-K-C4 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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