NA72212/72488DTimkenTapered Roller

Name: Timken NA72212/72488D Tapered Roller Bearing
Brand: Timken
SKU: NA72212/72488D

NA72212/72488D is a Timken tapered roller bearing, bore 53.98 mm, O.D. 123.83 mm, height 77.79 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d53.98mm

Outside dia. D123.83mm

Overall width T77.79mm

Dynamic Cr287kN

Weight4.08kg

Mean dia. dm88.9mm

Original catalogue drawing - Timken TRB Catalog, page 652

NA72212/72488D 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	53.975	2.125
D	Outside diameter	123.825	4.875
T	Overall assembly width	77.788	3.0625
C	Cup / outer-ring width	55.562	2.1875
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)	53.975
Bore d (in)	2.1250
Outside dia. D (mm)	123.825
Outside dia. D (in)	4.8750
Overall width T (mm)	77.788
Overall width T (in)	3.0625
Cup width C (mm)	55.562
Cup width C (in)	2.1875

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	64600
Basic dynamic load rating Cr (N)	287000
Dynamic rating C1 (N, ISO)	287000
Dynamic rating C1 (lbf, ISO)	64600
Radial rating C90 (N)	42800
Radial rating C90 (lbf)	9620
Thrust rating Ca90 (N)	54000
Thrust rating Ca90 (lbf)	12100
Factor e	0.74
Factor Y1	0.92
Factor Y2	1.36
Factor K	0.79

Weight

Weight (kg)	4.08

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)	2.3
Housing fillet r max (mm)	1.5
Shaft shoulder db (mm)	74.0
Housing shoulder Da (mm)	115.0

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	71,750	102	3,386
6	47,833	392	13,083
8	35,875	1,024	34,133
10	28,700	2,154	71,814
15	19,133	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 287,000 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.

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
33895/33821	Timken	Tapered Roller	53.98	95.25	28.57	130 kN	0.8
33895/33821D	Timken	Tapered Roller	53.98	95.25	63.5	226 kN	1.75
33895/33822	Timken	Tapered Roller	53.98	95.25	28.57	130 kN	0.81
389A/382	Timken	Tapered Roller	53.98	98.42	21.95	108 kN	0.69
389A/382A	Timken	Tapered Roller	53.98	96.84	21.95	108 kN	0.64
389A/384D	Timken	Tapered Roller	53.98	100	52.39	188 kN	1.6
389A/384ED	Timken	Tapered Roller	53.98	100	49.2	188 kN	1.52
39578/39520	Timken	Tapered Roller	53.98	112.71	30.16	167 kN	1.44

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