385X/384DTimkenTapered Roller

Name: Timken 385X/384D Tapered Roller Bearing
Brand: Timken
SKU: 385X/384D

385X/384D is a Timken tapered roller bearing, bore 55 mm, O.D. 100 mm, height 52.39 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d55mm

Outside dia. D100mm

Overall width T52.39mm

Dynamic Cr188kN

Weight1.55kg

Mean dia. dm77.5mm

Original catalogue drawing - Timken TRB Catalog, page 530

385X/384D 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	55	2.1654
D	Outside diameter	100	3.937
T	Overall assembly width	52.388	2.0625
C	Cup / outer-ring width	42.862	1.6875
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)	55.000
Bore d (in)	2.1654
Outside dia. D (mm)	100.000
Outside dia. D (in)	3.9370
Overall width T (mm)	52.388
Overall width T (in)	2.0625
Cup width C (mm)	42.862
Cup width C (in)	1.6875

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	42200
Basic dynamic load rating Cr (N)	188000
Dynamic rating C1 (N, ISO)	188000
Dynamic rating C1 (lbf, ISO)	42200
Radial rating C90 (N)	28000
Radial rating C90 (lbf)	6280
Thrust rating Ca90 (N)	16900
Thrust rating Ca90 (lbf)	3810
Factor e	0.35
Factor Y1	1.91
Factor Y2	2.84
Factor K	1.65
Geometry factor G1	42.0
Geometry factor G2	15.7
Geometry factor Cg	0.0859

Weight

Weight (kg)	1.55

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)	3.5
Housing fillet r max (mm)	0.8
Shaft shoulder db (mm)	67.0
Housing shoulder Da (mm)	93.0

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	47,000	102	3,386
6	31,333	392	13,083
8	23,500	1,024	34,133
10	18,800	2,154	71,814
15	12,533	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 188,000 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.530 (dimensions)
Series type	TDO

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
385/384D	Timken	Tapered Roller	55	100	52.39	188 kN	1.55
NA385/384CD	Timken	Tapered Roller	55	100	52.39	188 kN	1.56

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
385X/384ED	Timken	Tapered Roller	55	100	49.2	188 kN	1.48

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
30211	Timken	Tapered Roller	55	100	21	107 kN	0.72
30311	Timken	Tapered Roller	55	120	29	174 kN	1.63
31311	Timken	Tapered Roller	55	120	29	145 kN	1.57
32011X	Timken	Tapered Roller	55	90	23	94.9 kN	0.56
32211	Timken	Tapered Roller	55	100	25	121 kN	0.84
32311	Timken	Tapered Roller	55	120	43	228 kN	2.32
32311B	Timken	Tapered Roller	55	120	43	223 kN	2.45
33011	Timken	Tapered Roller	55	90	27	99.5 kN	0.66

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