NA438/432DTimkenTapered Roller

Name: Timken NA438/432D Tapered Roller Bearing
Brand: Timken
SKU: NA438/432D

NA438/432D is a Timken tapered roller bearing, bore 44.45 mm, O.D. 95.25 mm, height 61.91 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d44.45mm

Outside dia. D95.25mm

Overall width T61.91mm

Dynamic Cr221kN

Weight2kg

Mean dia. dm69.8mm

Original catalogue drawing - Timken TRB Catalog, page 650

NA438/432D 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	44.45	1.75
D	Outside diameter	95.25	3.75
T	Overall assembly width	61.915	2.4376
C	Cup / outer-ring width	50.8	2
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)	44.450
Bore d (in)	1.7500
Outside dia. D (mm)	95.250
Outside dia. D (in)	3.7500
Overall width T (mm)	61.915
Overall width T (in)	2.4376
Cup width C (mm)	50.800
Cup width C (in)	2.0000

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	49700
Basic dynamic load rating Cr (N)	221000
Dynamic rating C1 (N, ISO)	221000
Dynamic rating C1 (lbf, ISO)	49700
Radial rating C90 (N)	32900
Radial rating C90 (lbf)	7400
Thrust rating Ca90 (N)	16000
Thrust rating Ca90 (lbf)	3600
Factor e	0.28
Factor Y1	2.37
Factor Y2	3.53
Factor K	2.05

Weight

Weight (kg)	2.0

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)	3.5
Housing fillet r max (mm)	0.8
Shaft shoulder db (mm)	57.0
Housing shoulder Da (mm)	87.0

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	55,250	102	3,386
6	36,833	392	13,083
8	27,625	1,024	34,133
10	22,100	2,154	71,814
15	14,733	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 221,000 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.650 (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
435/432D	Timken	Tapered Roller	44.45	95.25	61.91	221 kN	2.01
NA438SW/432D	Timken	Tapered Roller	44.45	95.25	61.91	221 kN	2

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
12175/12303	Timken	Tapered Roller	44.45	76.99	17.14	49.5 kN	0.31
13175/13318	Timken	Tapered Roller	44.45	80.96	17.46	50.8 kN	0.39
13176D/13318	Timken	Tapered Roller	44.45	80.96	31.75	88.5 kN	0.74
17884/17830	Timken	Tapered Roller	44.45	79.38	33.55	-	0.52
18685/18620	Timken	Tapered Roller	44.45	79.38	17.46	52 kN	0.34
18685/18620D	Timken	Tapered Roller	44.45	79.38	41.27	90.6 kN	0.78
25580/25518	Timken	Tapered Roller	44.45	81.97	25.4	-	0.53
25580/25519	Timken	Tapered Roller	44.45	82.55	25.4	90.5 kN	0.55

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