3875/3821TimkenTapered Roller

Name: Timken 3875/3821 Tapered Roller Bearing
Brand: Timken
SKU: 3875/3821

3875/3821 is a Timken tapered roller bearing, bore 38.1 mm, O.D. 85.72 mm, height 101.6 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d38.1mm

Outside dia. D85.72mm

Overall width T101.6mm

Dynamic Cr216kN

Weight2.33kg

Mean dia. dm61.9mm

Original catalogue drawing - Timken TRB Catalog, page 672

3875/3821 Timken Tapered Roller bearing catalogue drawing

Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.

Scale cross-section

Blue = inner / outer ring, yellow = rolling element. Drawn to scale from this part's own dimensions for selection reference only - not a manufacturing or assembly drawing.

Dimension table (mm / inch)

Symbol	Dimension	mm	inch
d	Bore diameter	38.1	1.5
D	Outside diameter	85.725	3.375
T	Overall assembly width	101.6	4
C	Cup / outer-ring width	88.9	3.5

Notes

Tapered roller bearings are cone / cup assemblies; cone and cup weights are listed separately and the total is their sum. Weights are given in kg. Load ratings are shown in both the original catalogue units and the converted value (1 N = 0.2248 lbf). Data is provided for selection reference only - confirm against the latest official catalogue before ordering.

Main dimensions

Bore d (mm)	38.100
Bore d (in)	1.5000
Outside dia. D (mm)	85.725
Outside dia. D (in)	3.3750
Overall width T (mm)	101.600
Overall width T (in)	4.0000
Cup width C (mm)	88.900
Cup width C (in)	3.5000

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	48600
Basic dynamic load rating Cr (N)	216000
Dynamic rating C1 (N, ISO)	216000
Dynamic rating C1 (lbf, ISO)	48600
Radial rating C90 (N)	32200
Radial rating C90 (lbf)	7240
Thrust rating Ca90 (N)	22200
Thrust rating Ca90 (lbf)	4980
Factor e	0.40
Factor Y1	1.68
Factor Y2	2.50
Factor K	1.45

Weight

Weight (kg)	2.33

Mounting dimensions (fillets / shoulders)

Shaft shoulder db (mm)	49.5
Housing shoulder Da (mm)	81.0

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	54,000	102	3,386
6	36,000	392	13,083
8	27,000	1,024	34,133
10	21,600	2,154	71,814
15	14,400	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 216,000 N. Hours = L₁₀ x 10⁶ / (60n). Life-modification factors for lubrication, contamination and temperature (a_ISO) are not included.

Source & traceability

Brand	Timken
Source catalogue	Timken Tapered Roller Bearing Catalog (2016)
Catalogue page	p.672 (dimensions)
Series type	TS

ISO dynamic rating C1, Timken C90 / Ca90, static rating C0, geometry factors and assembly weight.

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
3875/3820	Timken	Tapered Roller	38.1	85.72	30.16	124 kN	0.85

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
13685/13620	Timken	Tapered Roller	38.1	69.01	19.05	67.2 kN	0.28
13685/13621	Timken	Tapered Roller	38.1	69.01	19.05	67.2 kN	0.28
13685/13621A	Timken	Tapered Roller	38.1	69.01	19.05	67.2 kN	0.27
13685/13621D	Timken	Tapered Roller	38.1	69.01	46.03	117 kN	0.66
13685/13624	Timken	Tapered Roller	38.1	69.97	19.05	67.2 kN	0.33
13685A/13620	Timken	Tapered Roller	38.1	69.01	19.05	67.2 kN	0.29
13685A/13621	Timken	Tapered Roller	38.1	69.01	19.05	67.2 kN	0.29
13686/13620	Timken	Tapered Roller	38.1	69.01	26.2	67.2 kN	0.35

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