81248-M Axial Cylindrical Roller Bearings, Single Direction, Single Row, Brass Cage

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81248-M

Bore Diameter:240 mm

Outside Diameter:340 mm

Width:78 mm

Weight:26.2 kg

Min. Order:1 Piece

The 81248-M Cylindrical roller thrust bearings are specifically designed for applications requiring heavy axial loads and stringent positioning accuracy. Classic applications include heavy-duty vertical lathe tables, marine propeller shaft thrust devices, large gearboxes, wind turbine main gearboxes, rolling mill pressing mechanisms, and crane slewing bearings.

The 81248-M bearing is a Axial cylindrical roller bearings, Single direction, Single row with an inner diameter of 240 mm , an outer diameter of 340 mm, a width of 78 mm. It typically uses PN (ABEC-1) grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic axial rated load is approximately 1367976 N, its static axial rated load is approximately 4994779 N. together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.

Interchange code: 812 48 M

Dimensions:

Inside Diameter:

240 mm

Outside Diameter:

340 mm

Thickness:

78 mm

Weight:

26.2 KG

Dynamic load Capacity, axial:

1367976 N

Static load Capacity, axial:

4994779 N

Fatigue Load Limit, Axial:

443259 N

Reference speed (Grease rpm):

328

Limiting speed (Oil rpm):

954

Specifications:

Old Designations:

81248M

Structure:

Cylindrical Roller Thrust Bearings

Number of Rows:

One

Precision Rating:

PN (ABEC-1)

Bearing Material:

GCr15SiMn

Cage Type:

M = Brass cage

Rolling Mlement Material:

GCr15SiMn

Bore Type:

Cylindrical bore

Operating Temperature:

-30 to 150 °C

System of Measurement:

Metric

Series:

812 series (812..-M)

Rolling Element:

cylindrical 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

81248-M bearings ( 240 mm x 340 mm x 78 mm) have the advantages of extremely high axial load capacity, high rigidity, compact axial structure, and a detachable design for easy installation, and are therefore widely used in the Machine tool worktables, extruders, differentials, wind power equipment, and oil drilling machinery.

Part Number	81248-M
Bearing Type	Axial cylindrical roller bearings, Single direction, Single row
Design	1
Equivalent	812 48 M
Series	812 series (812..-M)
Cage	M = Brass cage
Accuracy class	PN (ABEC-1)
Rows NO.	One
Axial cylindrical roller and cage assemblies	K81248-M
Housing locating washer	GS81248
Shaft locating washer	WS81248
Weight [lb]	57.7605
C_a Axial Dynamic [lbf]	307521
C_0a Axial static [lbf]	1122826
C_ua Axial Fatigue [lbf]	99644
n_B Speed ratings (grease) [rpm]	328
n_G Speed ratings (oil) [rpm]	954
d φ Inside [inch]	9.4488
D Φ Outside [inch]	13.3858
T Thickness [inch]	3.0709
B Width [inch]	0.9055
D₁ [inch]	9.6063
d₁ [inch]	13.1890
r(min.) [inch]	0.0827
Mounting dimensions
d_a [inch]	13.1890
D_a(max.) [inch]	10.2756
r_a(max.) [inch]	0.0827

The 81248-M Cylindrical roller thrust bearings mainly consist of a shaft ring, a housing ring, cylindrical rollers, and a cage assembly. The rollers are arranged radially, forming a line contact load-bearing structure.

The advantages of cylindrical roller thrust bearings include extremely high axial load capacity, excellent rigidity, and a low coefficient of friction. Optimized roller end faces and flanges can accommodate slight eccentricity and impact loads, while also featuring a compact structure and high rotational accuracy.

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81248-M Axial Cylindrical Roller Bearings, Single Direction, Single Row, Brass Cage

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