81218TN Axial Cylindrical Roller Bearings, Single Row, Single Direction, Plastic Cage
The 81218TN 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 81218TN bearing is a Axial cylindrical roller bearings, Single row, single direction with an inner diameter of 90 mm , an outer diameter of 135 mm, a width of 35 mm. It typically uses PN (ABEC-1) grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic axial rated load is approximately 289423 N, its static axial rated load is approximately 887969 N. together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
81218TN bearings ( 90 mm x 135 mm x 35 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 | 81218TN |
| Bearing Type | Axial cylindrical roller bearings, Single row, single direction |
| Equivalent | 812 18 TN |
| Series | 812 series (812..-TV) |
| Cage | TN = Plastic cage made from glass fibre reinforced polyamide 66 |
| Accuracy class | PN (ABEC-1) |
| Rows NO. | One |
| Axial cylindrical roller and cage assemblies | K81218-TV |
| Housing locating washer | GS81218 |
| Shaft locating washer | WS81218 |
| Bearing washer | LS6590 |
| Weight [lb] | 3.9021 |
| Ca Axial Dynamic [lbf] | 65062 |
| C0a Axial static [lbf] | 199615 |
| Cua Axial Fatigue [lbf] | 19695 |
| nB Speed ratings (grease) [rpm] | 893 |
| nG Speed ratings (oil) [rpm] | 2545 |
| d φ Inside [inch] | 3.5433 |
| D Φ Outside [inch] | 5.3150 |
| T Thickness [inch] | 1.3780 |
| D1 [inch] | 3.6614 |
| d1 [inch] | 5.3150 |
| r(min.) [inch] | 0.0433 |
| Mounting dimensions | |
| da [inch] | 5.0787 |
| Da(max.) [inch] | 3.7402 |
| ra(max.) [inch] | 0.0433 |
The 81218TN 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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