81238-M Axial Cylindrical Roller Bearings, Single Direction, Brass Cage

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81238-M

Bore Diameter:190 mm

Outside Diameter:270 mm

Width:62 mm

Weight:12.8 kg

Min. Order:1 Piece

The 81238-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 81238-M bearing is a Axial cylindrical roller bearings, Single row, single direction with an inner diameter of 190 mm , an outer diameter of 270 mm, a width of 62 mm. It typically uses PN (ABEC-1) grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic axial rated load is approximately 879404 N, its static axial rated load is approximately 2999246 N. together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.

Dimensions:

Inside Diameter:

190 mm

Outside Diameter:

270 mm

Thickness:

62 mm

Weight:

12.8 KG

Dynamic load Capacity, axial:

879404 N

Static load Capacity, axial:

2999246 N

Fatigue Load Limit, Axial:

267555 N

Reference speed (Grease rpm):

518

Limiting speed (Oil rpm):

1209

Specifications:

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:

-20 to 120 °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

81238-M bearings ( 190 mm x 270 mm x 62 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	81238-M
Bearing Type	Axial cylindrical roller bearings, Single row, single direction
Equivalent	812 38 M , 81238MPB
Series	812 series (812..-M)
Cage	M = Brass Cage
Accuracy class	PN (ABEC-1)
Rows NO.	One
Axial cylindrical roller and cage assemblies	K81238-M
Housing locating washer	GS81238
Shaft locating washer	WS81238
Weight [lb]	28.2189
C_a Axial Dynamic [lbf]	197690
C_0a Axial static [lbf]	674230
C_ua Axial Fatigue [lbf]	60146
n_B Speed ratings (grease) [rpm]	518
n_G Speed ratings (oil) [rpm]	1209
d φ Inside [inch]	7.4803
D Φ Outside [inch]	10.6299
T Thickness [inch]	2.4409
D₁ [inch]	7.6378
d₁ [inch]	10.5118
r(min.) [inch]	0.0787
Mounting dimensions
d_a [inch]	10.4330
D_a(max.) [inch]	7.8740
r_a(max.) [inch]	0.0787

The 81238-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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81238-M Axial Cylindrical Roller Bearings, Single Direction, Brass Cage

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