3878A/3821 Bore 36.513 Mm, 3800 Series, Tapered Roller Bearings Single Row - TS Type Imperial
The 3878A/3821 Imperial single-row tapered roller bearings are suitable for applications requiring combined loads and easy installation and maintenance. Classic applications include automotive wheel hubs and axles, industrial gearboxes, agricultural machinery, conveyor rollers, mining equipment, and machine tool spindles.
The 3878A/3821 bearing is a Tapered Roller Bearings Single Row - TS type Imperial with an inner diameter of 36.513 mm , an outer diameter of 85.725 mm, a width of 30.165 mm. GCr15 / SAE 52100 / 20CrNiMoA rings, GCr15 / SAE 52100 rolling mlement. Its dynamic axial rated load is approximately 5004 N, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: 3878A - 3821
3878A/3821 bearings ( 36.513 mm x 85.725 mm x 30.165 mm) have the advantages of Simultaneously withstands combined loads (radial and axial loads) and is detachable for installation, and are therefore widely used in the Automotive wheel hubs, axles, transmissions, industrial gearboxes, and machine tool spindles.
| Part Number | 3878A/3821 |
| Type | TS = Single-row (pressed steel and pin-type) |
| Manufacturer Part Code | 3878A-3821 |
| Reference From | TIMKEN 3878A/3821 |
| Inner ring (cone) | 3878A |
| Outer ring (cup) | 3821 |
| Series | 3800 |
| Bearing Type | Tapered Roller Bearings Single Row - TS type Imperial |
| Units | Inch |
| Rows NO. | Single row |
| Cage Material | Sheet metal |
| Temperature - T(min) [°C] | -30 |
| Temperature - T(max) [°C] | 110 |
| C1 Dynamic Radial [lbf] | 27892 |
| Ca90 Dynamic Axial [lbf] | 5004 |
| C90 Dynamic Radial [lbf] | 7244 |
| C0 Static Radial [lbf] | 33240 |
| Dimensions | |
| d φ Inside [inch] | 1.4375 |
| D Φ Outside [inch] | 3.375 |
| T thickness [inch] | 1.1876 |
| B Cone Width [inch] | 1.1875 |
| C Cup Width [inch] | 0.9375 |
| a Effective center [inch] | -0.32 |
| r Fillet Radius (Housing) [inch] | 0.05 |
| R Fillet Radius (Shaft) [inch] | 0.14 |
| Ab [inch] | 0.11 |
| Aa [inch] | 0.04 |
| da Dia.(Shaft) [inch] | 1.85 |
| db Dia.(Shaft) [inch] | 2.13 |
| Da Dia.(Housing) [inch] | 3.23 |
| Db Dia.(Housing) [inch] | 2.95 |
| Coefficient | |
| e | 0.4 |
| Y | 1.49 |
| K | 1.45 |
| Cg Geometry | 0.0873 |
The 3878A/3821 Imperial single-row tapered roller bearings mainly consist of an outer ring, inner ring, tapered rollers, and a cage. The outer and inner ring assemblies are separable for easy installation and adjustment. The rollers make line contact with the raceways. The cage is typically made of stamped steel or brass.
Imperial single-row tapered roller bearings can simultaneously withstand radial and unidirectional axial loads, exhibiting high load-bearing capacity and rigidity. Their separable structure facilitates clearance adjustment and preload control, resulting in a high limiting speed. They conform to imperial standard dimensions and offer excellent interchangeability.
Share this product to:
Let more people see your product
