NA643/632DTimkenTapered Roller

Name: Timken NA643/632D Tapered Roller Bearing
Brand: Timken
SKU: NA643/632D

NA643/632D is a Timken tapered roller bearing, bore 69.85 mm, O.D. 136.53 mm, height 95.25 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d69.85mm

Outside dia. D136.53mm

Overall width T95.25mm

Dynamic Cr406kN

Weight5.88kg

Mean dia. dm103.2mm

Original catalogue drawing - Timken TRB Catalog, page 652

NA643/632D 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	69.85	2.75
D	Outside diameter	136.525	5.375
T	Overall assembly width	95.25	3.75
C	Cup / outer-ring width	76.2	3
r	Chamfer (min)	1.5	0.0591

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)	69.850
Bore d (in)	2.7500
Outside dia. D (mm)	136.525
Outside dia. D (in)	5.3750
Overall width T (mm)	95.250
Overall width T (in)	3.7500
Cup width C (mm)	76.200
Cup width C (in)	3.0000

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	91200
Basic dynamic load rating Cr (N)	406000
Dynamic rating C1 (N, ISO)	406000
Dynamic rating C1 (lbf, ISO)	91200
Radial rating C90 (N)	60400
Radial rating C90 (lbf)	13600
Thrust rating Ca90 (N)	37400
Thrust rating Ca90 (lbf)	8420
Factor e	0.36
Factor Y1	1.86
Factor Y2	2.78
Factor K	1.61

Weight

Weight (kg)	5.88

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)	3.5
Housing fillet r max (mm)	1.5
Shaft shoulder db (mm)	86.0
Housing shoulder Da (mm)	125.0

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	101,500	102	3,386
6	67,667	392	13,083
8	50,750	1,024	34,133
10	40,600	2,154	71,814
15	27,067	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 406,000 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
643/632D	Timken	Tapered Roller	69.85	136.53	95.25	481 kN	5.78
NA643SW/632D	Timken	Tapered Roller	69.85	136.53	95.25	406 kN	5.92

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
29675/29620	Timken	Tapered Roller	69.85	112.71	25.4	111 kN	0.95
29675/29622D	Timken	Tapered Roller	69.85	114.29	58.74	192 kN	2.2
29675/29630	Timken	Tapered Roller	69.85	120.65	25.4	111 kN	1.16
33275/33461	Timken	Tapered Roller	69.85	117.47	30.16	-	1.26
33275/33462	Timken	Tapered Roller	69.85	117.47	30.16	138 kN	1.26
33275/33462D	Timken	Tapered Roller	69.85	117.47	66.67	241 kN	2.81
33275/33472	Timken	Tapered Roller	69.85	120	30.16	138 kN	1.35
47487/47420	Timken	Tapered Roller	69.85	120	32.55	179 kN	1.46

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