Original catalogue drawing - Timken TRB Catalog, page 354
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
254
10
D
Outside diameter
315.912
12.4375
B
Inner-ring / bearing width
31.75
1.25
T
Overall assembly width
31.75
1.25
C
Cup / outer-ring width
22.225
0.875
r
Chamfer (min)
4.8
0.189
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)
254.000
Bore d (in)
10.0000
Outside dia. D (mm)
315.912
Outside dia. D (in)
12.4375
Width B (mm)
31.750
Overall width T (mm)
31.750
Overall width T (in)
1.2500
Cup width C (mm)
22.225
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
57300
Basic static load rating Cor (lbs)
126000
Basic dynamic load rating Cr (N)
255000
Basic static load rating C0r (N)
561000
Dynamic rating C1 (N, ISO)
255000
Dynamic rating C1 (lbf, ISO)
57300
Radial rating C90 (N)
66100
Radial rating C90 (lbf)
14900
Thrust rating Ca90 (N)
48700
Thrust rating Ca90 (lbf)
10900
Static rating C0 (N)
561000
Static rating C0 (lbf)
126000
Factor e
0.43
Factor Y
1.39
Factor K
1.36
Geometry factor G1
817.0
Geometry factor G2
322.2
Geometry factor Cg
0.1295
Effective load centre a (mm)
22.4
Weight
Weight (kg)
4.8
Mounting dimensions (fillets / shoulders)
Shaft fillet R max (mm)
3.5
Housing fillet r max (mm)
4.8
Shaft shoulder da (mm)
262.0
Shaft shoulder db (mm)
268.0
Housing shoulder Da (mm)
305.0
Housing shoulder Db (mm)
298.0
Cage projection Aa (mm)
4.6
Cage projection Ab (mm)
1.5
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 500 rpm
4
63,750
102
3,386
6
42,500
392
13,083
8
31,875
1,024
34,133
10
25,500
2,154
71,814
15
17,000
8,323
277,449
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 255,000 N. Hours = L10 x 106 / (60n). Life-modification factors for lubrication, contamination and temperature (aISO) are not included.
Source & traceability
Brand
Timken
Source catalogue
Timken Tapered Roller Bearing Catalog (2016)
Catalogue page
p.354 (dimensions)
Series type
TS
ISO dynamic rating C1, Timken C90 / Ca90, static rating C0, geometry factors and assembly weight.
Send us the quantity you need and we will come back with price and
lead time, normally within 24 hours. Equivalent parts from other brands can be quoted at the same time.
