NA3780/3729DTimkenTapered Roller

Name: Timken NA3780/3729D Tapered Roller Bearing
Brand: Timken
SKU: NA3780/3729D

NA3780/3729D is a Timken tapered roller bearing, bore 50.8 mm, O.D. 93.26 mm, height 65.09 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d50.8mm

Outside dia. D93.26mm

Overall width T65.09mm

Dynamic Cr213kN

Weight1.83kg

Mean dia. dm72mm

Original catalogue drawing - Timken TRB Catalog, page 652

NA3780/3729D 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	50.8	2
D	Outside diameter	93.264	3.6718
T	Overall assembly width	65.088	2.5625
C	Cup / outer-ring width	52.388	2.0625
r	Chamfer (min)	0.8	0.0315

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)	50.800
Bore d (in)	2.0000
Outside dia. D (mm)	93.264
Outside dia. D (in)	3.6718
Overall width T (mm)	65.088
Overall width T (in)	2.5625
Cup width C (mm)	52.388
Cup width C (in)	2.0625

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	47800
Basic dynamic load rating Cr (N)	213000
Dynamic rating C1 (N, ISO)	213000
Dynamic rating C1 (lbf, ISO)	47800
Radial rating C90 (N)	31700
Radial rating C90 (lbf)	7120
Thrust rating Ca90 (N)	18300
Thrust rating Ca90 (lbf)	4120
Factor e	0.34
Factor Y1	1.99
Factor Y2	2.97
Factor K	1.73

Weight

Weight (kg)	1.83

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)	3.5
Housing fillet r max (mm)	0.8
Shaft shoulder db (mm)	64.0
Housing shoulder Da (mm)	87.9

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	53,250	102	3,386
6	35,500	392	13,083
8	26,625	1,024	34,133
10	21,300	2,154	71,814
15	14,200	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 213,000 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.652 (dimensions)
Series type	TNA

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

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
3775/3729D	Timken	Tapered Roller	50.8	93.26	65.09	213 kN	1.83
3780/3729D	Timken	Tapered Roller	50.8	93.26	65.09	213 kN	1.82
3784/3729D	Timken	Tapered Roller	50.8	93.26	65.09	213 kN	1.78
NA3780SW/3729D	Timken	Tapered Roller	50.8	93.26	65.09	213 kN	1.81

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
18200/18335E	Timken	Tapered Roller	50.8	85	18.26	-	0.42
18200/18337	Timken	Tapered Roller	50.8	85.72	18.26	61.1 kN	0.39
18790/18720	Timken	Tapered Roller	50.8	85	17.46	54.7 kN	0.36
18790/18721	Timken	Tapered Roller	50.8	83.31	17.46	54.7 kN	0.34
18790/18723	Timken	Tapered Roller	50.8	88.9	17.46	54.7 kN	0.48
18790/18724	Timken	Tapered Roller	50.8	88.9	17.46	54.7 kN	0.42
28580/28520	Timken	Tapered Roller	50.8	89.98	25.4	98.9 kN	0.66
28580/28521	Timken	Tapered Roller	50.8	92.08	25.4	98.9 kN	0.7

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